JPH1174876A - Frame synchronization control device - Google Patents

Abstract

(57) [Summary] [Problem] In intermittent reception, it has been a problem to achieve both frame synchronization and low power consumption. SOLUTION: A synchronizing word detecting unit 1 for detecting a synchronizing word from a received signal, a frame synchronizing judging unit 5 for judging frame synchronization / asynchronization from the detection result, and a number of protection stages for frame synchronization for setting a value of the number of protection stages A setting unit 4, an aperture width setting unit 6 for setting an aperture width value, a correlation threshold setting unit 7 for setting a correlation threshold value, and an intermittent reception timing estimating unit for estimating a frame phase at the start of the next reception 8 and
A timing control unit 2 for correcting a frame phase based on an estimated value of the frame phase at the start of the next reception; and a timing control unit 2 for correcting the frame phase based on the aperture width set by the aperture width setting unit and the frame phase corrected by the timing control unit. Aperture control section 3 for controlling the width of the aperture and the opening position. [Effect] Power consumption in intermittent reception can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame synchronization control device after symbol synchronization is established in a digital radio communication receiver such as a satellite mobile communication, a portable telephone, and a car telephone service when intermittent reception is performed. It is.

[0002]

2. Description of the Related Art A conventional frame synchronization control device will be described with reference to FIG. FIG. 7 is a block diagram showing a configuration of a conventional frame synchronization control device.

In FIG. 7, reference numeral 1 denotes a synchronizing word detecting unit for detecting a synchronizing word included in a received signal; 2, a timing control unit having a symbol counter for controlling a frame phase and a frame counter therein; An aperture control unit that controls such as increasing or decreasing the aperture width according to the aperture width set by the aperture width setting unit, and controlling a position (phase) of opening the aperture according to the frame phase given by the timing control unit 2; Reference numeral 4 denotes a frame synchronization protection stage number setting unit for setting the number of protection stages, which is one of the frame synchronization control parameters serving as a synchronization / asynchronization determination criterion, and 5 denotes a frame synchronization / frame synchronization based on the detection result obtained by the synchronization word detection unit 1. A frame synchronization determining unit 6 for determining whether or not the synchronization is performed is provided with an address, which is one of the parameters for frame synchronization control. Aperture width setting unit that sets a Cha width, 7 is a correlation threshold setting unit for setting a correlation threshold, which is one of the similarly frame synchronization control parameters.

In the example of FIG. 7, there are the following two types of operations for intermittent reception. First, the power of the frame synchronization control device is turned off during reception suspension in intermittent reception.
In this method, the frame counter is stopped, the frame synchronization is once released, the power is turned on at the start of reception, and the frame synchronization is re-drawn.

Second, the power of the frame synchronization control device is kept ON even during reception suspension, a frame counter is operated using a high-precision oscillator provided in the receiver, and the frame phase is followed even during reception suspension. It is a method.

In the former method, frames are out of synchronization,
An unnecessary process of re-locking is required, and the reception start time (time for turning on the power of the frame synchronization control device) needs to be advanced by the time required for re-locking.

In the latter case, unnecessary processing of re-locking after synchronization is lost is eliminated. However, frame synchronization during reception suspension depends on the accuracy of the oscillator in the receiver. Since the symbol counter and frame counter need to be operated,
There is a problem that this is contrary to the request for intermittent reception to be set to F.

Next, another conventional frame synchronization control device will be described with reference to FIG. FIG. 8 is a block diagram showing a configuration of a conventional frame synchronization control apparatus for a simplified portable telephone disclosed in Japanese Patent Application Laid-Open No. 8-46565.

In FIG. 8, reference numeral 101 denotes a synchronizing word (UW) detecting unit, 102 denotes a slot counter for controlling data reception in the receiver, 103 denotes a phase detecting unit, and 104 denotes prediction of a phase transition of a synchronizing word generated during intermittent reception. Expected position setting means, 105 is a DPLL controller (digital PLL) for generating a phase-controlled master clock, 106 is an oscillator (OSC) for generating a clock n times faster than the master clock, and 107 is for intermittent reception. An accuracy determination unit 108 for controlling the DPLL by calculating the average value of the past detected phase differences during the reception suspension, and a frequency divider 108 for generating a timing clock.

In the example shown in FIG. 8, the power of the frame synchronization control device is kept ON even during reception suspension in intermittent reception, and D
The input of the PLL control unit 105 is switched by an internal selector. During intermittent reception, the frame synchronization is tracked from the received data, and during reception suspension, the phase error average value for a fixed frame accumulated during intermittent reception by the accuracy determination unit 107. It is devised to follow frame synchronization using signals.

In this case, the problem of maintaining the frame synchronization during reception suspension in the latter method described with reference to FIG. 7 depends on the accuracy of the oscillator in the receiver is solved. Must be turned on.

[0012]

In the conventional frame synchronization control device as described above, if the power is turned off during reception suspension during intermittent reception, if the reception suspension time is long,
Since the transition of the frame phase becomes large, it is necessary to perform the frame synchronization re-pulling process at the same time as the reception starts. Then, it is necessary to advance the start of reception (time to turn on the power of the frame synchronization control device) by the time required for re-pulling. Further, when trying to follow the frame synchronization even during reception suspension, it is necessary to turn on the power of the frame synchronization control device and correct the frame phase with respect to the transition of the frame phase during that time. Either control technique has a problem in that it results in a reduction in power consumption, which is an item required for intermittent reception.

[0013] The present invention has been made to solve the above-mentioned problem, in which the power is turned off during reception suspension in intermittent reception (that is, the symbol counter and the frame counter are stopped), and By estimating the frame phase immediately after the start of the next reception from the frame phase immediately before the reception pause and the frame phase transition between the reception pauses, the frame synchronization can be maintained and the power consumption can be further reduced. The aim is to obtain a control device.

[0014]

A frame synchronization control device according to the present invention is a frame synchronization control device for intermittently receiving a received signal and turning off the power during reception suspension to establish frame synchronization from the received signal. A synchronizing word detecting unit for detecting a necessary synchronizing word, a frame synchronizing judging unit for judging frame synchronism / asynchronization from the detection result of the synchronizing word detecting unit, and a frame synchronizing control as a frame synchronizing / asynchronizing judging standard A frame synchronization protection stage number setting unit for setting the value of the number of protection stages as a parameter;
An aperture width setting unit that sets an aperture width value that is a frame synchronization control parameter serving as an asynchronous determination reference, and sets a correlation threshold value that is a frame synchronization control parameter that serves as a frame synchronization / asynchronization determination reference. A correlation threshold setting unit, an intermittent reception timing estimating unit for estimating a transition of a frame phase that occurs during reception suspension of intermittent reception and estimating a frame phase at the start of the next reception, and a frame phase at the start of the next reception. A timing controller for correcting a frame phase based on the estimated value; and an aperture for controlling an aperture width and an opening position based on the aperture width set by the aperture width setting unit and the frame phase corrected by the timing controller. And a control unit.

Further, in the frame synchronization control apparatus according to the present invention, the intermittent reception timing estimating unit stores a frame phase immediately before reception suspension in intermittent reception, and stores the phase from the reception suspension to the next reception start in the phase. The frame phase at the start of the next reception is estimated by adding the frame phase transition between pauses.

Further, in the frame synchronization control device according to the present invention, the intermittent reception timing estimating unit may be configured to receive the transition of the frame phase during the reception suspension from the reception suspension to the start of the next reception, the reception time, the reception suspension time, and the reception time. It is obtained from the bit rate of the signal.

Further, the frame synchronization control device according to the present invention further comprises a reception pause / start interval calculation unit for correcting the reception pause time based on the past statistical value of the aperture opening position.

Further, the frame synchronization control device according to the present invention further comprises at least the frame synchronization protection stage number setting section, the aperture width setting section,
And a synchronous state transition control unit for intermittent reception for changing any set value of the correlation threshold value setting unit.

The frame synchronization control device according to the present invention comprises:
In a frame synchronization control device for intermittently receiving a received signal and turning off the power during reception suspension, a synchronization word detection unit that detects a synchronization word necessary to establish frame synchronization from the reception signal; and a synchronization word detection unit. A frame synchronization determination unit that determines frame synchronization / asynchronization from the detection result, a frame synchronization protection stage number setting unit that sets a value of a protection stage number that is a frame synchronization control parameter serving as a frame synchronization / asynchronization determination reference, An aperture width setting unit that sets an aperture width value that is a frame synchronization control parameter serving as a frame synchronization / asynchronization determination reference; and a correlation threshold value that is a frame synchronization control parameter serving as a frame synchronization / asynchronization determination reference. A correlation threshold value setting unit for setting a value,
A timing control unit that controls a frame phase, an aperture control unit that controls an aperture width and an opening position based on the aperture width set by the aperture width setting unit and the frame phase controlled by the timing control unit; A synchronous state transition control unit for intermittent reception for switching state transitions according to the state.

Further, in the frame synchronization control device according to the present invention, the intermittent reception synchronization state transition control unit may include at least the frame synchronization protection stage number setting unit, the aperture width setting unit, It changes one of the set values of the correlation threshold setting unit.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. First Embodiment A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing a configuration of the first embodiment of the present invention. FIG.
5 is a timing chart showing the operation of the first embodiment of the present invention. In the drawings, the same reference numerals indicate the same or corresponding parts.

The frame synchronization control device according to the present invention comprises:
Used for digital wireless communication receivers that receive received signals intermittently. During reception pause, the power of the device is turned off, and the frame phase transition that occurs during reception pause is corrected immediately after the start of reception to maintain frame synchronization. It has a frame synchronization control technology.

In FIG. 1, reference numeral 1 denotes a synchronizing word detecting unit for detecting a synchronizing word included in a received signal and necessary for establishing frame synchronization, and 2 denotes a timing internally provided with a symbol counter for controlling a frame phase and a frame counter. Control unit, 3
Controls such as increasing or decreasing the aperture width according to the aperture width set by the aperture width setting unit described later, and controlling the aperture opening position to be advanced or delayed based on the value obtained by the timing estimation unit described later. Is an aperture control unit that performs

In FIG. 1, reference numeral 4 denotes a frame synchronization protection stage number setting unit for setting the number of protection stages, which is one of the frame synchronization control parameters serving as a synchronization / asynchronization determination reference. A frame synchronization determination unit that determines the synchronization / asynchronization of the frame from the obtained detection result, 6 is an aperture width setting unit that sets an aperture width which is one of the frame synchronization control parameters, and 7 is a frame synchronization control parameter. It is a correlation threshold setting unit that sets one correlation threshold.

Further, in the figure, 8 stores the frame phase immediately before the reception pause, and adds the frame phase transition during the reception pause from the reception pause to the start of the next reception to the phase to obtain the next reception. This is an intermittent reception timing estimating unit that estimates a frame phase at the start. The intermittent reception operation ON / OFF signal is input from the outside to turn on / off the power of the frame synchronization control device in the intermittent reception.

Next, the operation of the first embodiment will be described with reference to FIG. 2, focusing on the intermittent reception operation ON / OFF signal and the intermittent reception timing estimating unit 8, which are different from the conventional example.

The frame numbers 0 and 4 shown in FIG.
Is a frame including data that the user originally wants to receive, and here, consider a receiver that intermittently receives only that frame and suspends reception otherwise.

Here, the reception time is “T ₁ ”, the reception suspension time is “T ₂ ”, the frame phase immediately before the reception suspension is “φ ₁ ”,
The transition of the frame phase during the suspension of reception is “φ ₂ ”, and the frame phase at the start of the next reception is “φ ₃ ”.

At this time, the intermittent reception timing estimating unit 8 estimates the frame phase at the start of the next reception by the following three procedures. 1) Frame phase φ ₁ immediately before suspension of reception
Is stored. 2) Calculate the frame phase transition φ ₂ during the reception pause. Here, φ ₂ can be easily calculated from T ₁ , T ₂ and the bit rate of the received signal. Since these values are fixed values, φ ₂ is also a fixed value. Thus, it phi ₂ may be calculated once, as a give way, for example, methods such as preset as a default value in an intermittent reception timing within estimator 8 is conceivable. 3) by adding the phi ₂ to the phi _1, it estimates the frame phase phi ₃ of the next start of reception.

For example, FIG. 2 also shows an example in which φ _{1 to} φ ₃ are converted into symbol values using a symbol counter. For simplicity, one frame consists of five symbols (hereinafter, S
Called. ), The synchronization word (UW) is located at the 2S position, and the synchronization word length is 1S. Also, it is assumed that the symbol synchronization is almost established in the transmitter / receiver without considering the phase deviation of the symbol clock as an absolute condition.

In the case of FIG. 2, the frame phase φ ₁ is stored as the symbol counter value = 4, as shown in FIG. Then, φ ₂ has a symbol value of 5 for one frame.
S, and since the number of frames during the reception suspension is three, the frame phase transition φ ₂ during that period is 3 × 5 = 1
5S. As a result, the frame phase φ ₃ (= φ ₁ + φ ₂ ) at the start of the next reception becomes 20 as the symbol counter value.

Since the synchronization word detection position is known in advance to be 2S from the beginning of the frame, it is clear that the frame counter values 1 and 21 are the synchronization word detection positions. Therefore, this value (= 20) is loaded into the symbol counter at the start of the next reception, that is, when the intermittent reception operation ON / OFF signal is turned ON (FIG. 2).
(D)), the symbol counter value = 21 is determined to be the expected position for detecting the synchronizing word, and the aperture is opened centering there (FIG. 2).
(E)) Then, the synchronization word can be detected smoothly.
This makes it possible to estimate the frame phase (= synchronous word detection position).

However, the operation for intermittent reception in FIG.
The / OFF signal is used to turn on / off the power of the frame synchronization controller.
The power of each unit of the frame synchronization control device is turned on only when this signal is turned on, and is turned off otherwise. This signal is input from outside of a frame synchronization control device such as another control device in the receiver, for example, a timing reproduction unit for establishing symbol synchronization or a timer control device for time management in the receiver. Of course, it may be incorporated inside.

The digital radio communication receiver using the frame synchronization control apparatus according to the first embodiment performs a receiving operation intermittently. After performing the receiving operation for a predetermined time, the receiving operation is performed for a predetermined time. It is a system that pauses. Although the reception operation time and the reception suspension time vary depending on the system, they are usually at regular intervals in the same system. For example, a simple portable telephone (P
In the case of (HS), the receiving operation interval is fixed at 625 μsec, the receiving pause interval is fixed at 1.13 sec, and in the case of a mobile phone (PDC), the receiving operation interval is fixed at 6.67 msec, and the receiving pause interval is fixed at 713 msec. As described above, by utilizing the fact that the reception operation / pause interval is a fixed value in the system, the intermittent reception timing estimating unit 8 operates even when the power of the frame synchronization control device is turned off and the frame counter is stopped. The frame phase at the start of the next reception in the intermittent reception can be estimated.

That is, in the first embodiment, in intermittent reception, the frame phase immediately before reception suspension is stored, and the frame phase transition during reception suspension from the reception suspension to the start of the next reception is added to the phase. Intermittent reception timing estimating unit 8 for estimating the frame phase at the start of the next reception
With this configuration, the power of the frame synchronization control device can be turned off during reception suspension, and frame synchronization can be maintained even at the start of reception in intermittent reception. This contributes to further lower power consumption of the device in intermittent reception.

Embodiment 2 Second Embodiment A second embodiment of the present invention will be described with reference to FIGS. FIG.
FIG. 9 is a block diagram showing a configuration of a second embodiment of the present invention. FIG. 4 is a state transition diagram showing the operation of the second embodiment of the present invention.

In FIG. 3, reference numeral 1 denotes a synchronizing word detecting unit for detecting a synchronizing word included in a received signal and necessary for establishing frame synchronization, and 2 denotes a timing having a symbol counter for controlling a frame phase and a frame counter therein. Control unit, 3
Controls such as increasing or decreasing the aperture width according to the aperture width set by the aperture width setting unit described later, and controlling the aperture opening position to be advanced or delayed based on the value obtained by the timing estimation unit described later. Is an aperture control unit that performs the following.

In the figure, reference numeral 4 denotes a frame synchronization protection stage number setting unit for setting the number of protection stages, which is one of the frame synchronization control parameters serving as a synchronization / asynchronization determination criterion; A frame synchronization determination unit that determines the synchronization / asynchronization of the frame from the obtained detection result, 6 is an aperture width setting unit that sets an aperture width which is one of the frame synchronization control parameters, and 7 is a frame synchronization control parameter. It is a correlation threshold setting unit that sets one correlation threshold.

Further, in the same figure, 8 stores the frame phase immediately before the reception pause, and adds the frame phase transition during the reception pause, which transitions from the reception pause to the next reception start, to the phase to obtain the next reception. The intermittent reception timing estimating unit 9 for estimating the frame phase at the start time switches the state transition of the frame synchronization control device depending on the reception state, for example, between continuous reception and intermittent reception, or between a synchronous state and an asynchronous state. This is a synchronous state transition control unit for intermittent reception that realizes frame synchronous control in the receiving state. The intermittent reception operation ON / OFF signal is input from the outside to turn on / off the power of the frame synchronization control device in the intermittent reception.

The frame synchronization control device according to the second embodiment is an improvement of the frame synchronization control device described in the first embodiment. In the frame synchronization control device according to the first embodiment, the power of the device is turned off during reception suspension.
Therefore, there is no means in the receiver for accurately determining the reception suspension time T ₂ , that is, the frame phase transition φ ₂ during the reception suspension. T ₂ are but determines as the time to when the frame synchronization control is returned to the next ON from the time when turned OFF by the operation ON / OFF signal for intermittent reception, the accuracy is uncertain. Therefore, as shown in FIG. 2B ′, a slight deviation is expected in the value of T2.

The frame synchronization control apparatus according to the second embodiment allows the estimated deviation of the frame phase φ ₃ due to the accuracy of the oscillator and changes the set value of the frame synchronization control parameter, thereby reducing the estimated deviation. It is intended to supplement.

Next, the operation of the second embodiment will be described with a focus on the intermittent reception synchronization state transition control unit 9 which is different from the first embodiment.

As described in the first embodiment, when the frame phase transition φ ₂ between reception pauses (that is, the frame pause time T ₂ ) is correctly given (FIG. 2B), the intermittent reception is performed. The timing estimation unit 8 accurately estimates the frame phase φ ₃ at the start of the next reception, and loads the frame counter with a correct value.

[0044] However, T ₂ depends largely on the accuracy of the operation ON / OFF signal for intermittent reception, as described above, the estimation of the order frame phase phi ₃ is greatly affect its accuracy. Therefore, the intermittent reception synchronization state transition control unit 9 aims to allow the estimation deviation of the frame phase to occur here and to improve the synchronization holding probability of the frame.
The frame synchronization control device has a plurality of state transitions, and controls to switch the state transitions depending on each reception state such as a synchronous state and an asynchronous state, continuous reception and intermittent reception.

More specifically, at the time of intermittent reception, for example, "the number of protection stages", which is one of the frame synchronization control parameters, is set to be larger than that at the time of normal continuous reception. "Correlation threshold" is set low. Alternatively, a change such as setting a wider “aperture width”, which is one of the frame synchronization control parameters, is performed by state transition. In addition, these parameters are set in combination.

Conversely, in a reception state in which frame synchronization is stable during normal continuous reception, it is necessary to reduce the “number of protection steps”, set a “correlation threshold” high, or narrow an “aperture width”. Is set to improve the synchronization word detection error, or these are combined.

In this way, the synchronization word detection error is degraded at the time of intermittent reception and the drawback time is increased. However, the holding probability of the frame synchronization can be improved. Is reduced, but the pull-in time of frame synchronization can be improved. As described above, by changing the state transition of the frame synchronization control device and the synchronization control parameter value depending on the reception state, synchronization control suitable for each reception state can be performed.

That is, in the second embodiment, since the frame phase obtained as in the first embodiment greatly depends on the accuracy of the oscillator in the receiver, the state transition (frame synchronization) of the frame synchronization control device is performed. Intermittent reception synchronous state transition control unit 9 for switching control parameters (including control parameters).
Is provided, it is possible to reliably maintain the frame synchronization after the suspension of reception, and to further reduce the power consumption of the device due to the intermittent reception.

Embodiment 3 Third Embodiment A third embodiment of the present invention will be described with reference to FIGS. FIG.
FIG. 13 is a block diagram showing a configuration of a third embodiment of the present invention. FIG. 6 is a diagram showing statistical values of the aperture opening position according to the third embodiment of the present invention.

In FIG. 5, reference numeral 1 denotes a synchronizing word detecting unit for detecting a synchronizing word included in a received signal and necessary for establishing frame synchronization, and 2 denotes a timing internally provided with a symbol counter for controlling a frame phase and a frame counter. Control unit, 3
Controls such as increasing or decreasing the aperture width according to the aperture width set by the aperture width setting unit described later, and controlling the aperture opening position to be advanced or delayed based on the value obtained by the timing estimation unit described later. Is an aperture control unit that performs the following.

In the figure, reference numeral 4 denotes a frame synchronization protection stage number setting unit for setting the number of protection stages, which is one of the frame synchronization control parameters serving as a synchronization / asynchronization determination reference. A frame synchronization determination unit that determines the synchronization / asynchronization of the frame from the obtained detection result, 6 is an aperture width setting unit that sets an aperture width which is one of the frame synchronization control parameters, and 7 is a frame synchronization control parameter. It is a correlation threshold setting unit that sets one correlation threshold.

Further, in the same figure, 8 stores the frame phase immediately before reception suspension, and adds the frame phase transition during the reception suspension transition from the reception suspension to the start of the next reception to the phase, thereby obtaining the next reception. The intermittent reception timing estimating unit 9 for estimating the frame phase at the start time switches the state transition of the frame synchronization control device depending on the reception state, for example, between continuous reception and intermittent reception, or between a synchronous state and an asynchronous state. discontinuous reception synchronization state transition control unit for realizing the frame synchronization control was in the reception state, 10 is a reception pause / start interval calculation unit to take the frame phase shift phi ₂ statistics between the received pause several past. The operation for intermittent reception ON / OF
The F signal is input from the outside to turn on / off the power of the frame synchronization control device in intermittent reception.

The frame synchronization control device according to the third embodiment is an improvement of the frame synchronization control device described in the second embodiment. The frame synchronization control device of the second embodiment, as described above, the frame phase phi ₃ at reception start in the intermittent reception, is estimated in the intermittent reception timing estimating unit 8. However, as described above, the required variables φ ₂ and T ₂ for obtaining the estimated values greatly depend on the accuracy of the intermittent reception operation ON / OFF signal supplied from outside the frame synchronization control device. Embodiment 2
In this embodiment, the control is performed not in the direction in which the estimated deviation is corrected but in the direction in which the deviation is permitted. In the third embodiment, the control is performed in the direction in which the deviation is corrected. In other words, the statistic of the phase estimation deviation during the past several reception pauses of φ ₂ is obtained, and the value is fed back to the intermittent reception timing estimating unit 8 to estimate the frame phase φ ₃ with higher accuracy.

Next, the operation of the third embodiment will be described focusing on the reception pause / start interval calculation unit 10 which is different from the second embodiment.

[0055] 'As shown, if the deviation in the received downtime T ₂ by the accuracy of the oscillator occurs, the symbol counter value is the effect 2 and (d) (d 2 (b)' as) An error occurs, which causes an error in the aperture phase based on the symbol counter value as shown in FIGS. In the example of FIG. 2, (e ′) is shifted to the left by 1S compared to (e).

Such a shift in the aperture phase is determined in the past k
Taking statistics on between times of reception pause, to correct the received pause time T ₂ by statistical value of the deviation as shown in FIG. FIG.
(A) shows a case is less variation in the reception pause time T _2, in this case, the correction is not, it sets a narrow aperture width.

On the other hand, FIG. 6B shows a case where there is a large variation in the reception suspension time T _{2. In} this case, correction is performed and the aperture width is set wide.

In addition to the above-described method of giving the correction value, in addition to the method of determining the (k + 1) th correction value from the average value of the past k times, for example, the average value of the first and second times is used. A method of calculating a geometric mean, such as calculating the third correction value and calculating the next correction value from the result and the statistics of the fourth time, or a method of obtaining a variance value of deviation can be considered.

That is, in the third embodiment, the intermittent reception timing estimating unit 8 uses the average of the past several times the transition of the inter-reception-pause frame phase used for estimating the frame phase, thereby obtaining more accurate results. By providing the reception pause / start interval calculation unit 10 for calculating, it is possible to more accurately estimate the frame phase at the start of reception in intermittent reception, and thereby, the probability of maintaining frame synchronization at the start of reception in intermittent reception Is greatly improved.

[0060]

As described above, in the frame synchronization control device according to the present invention, in the frame synchronization control device for intermittently receiving the received signal and turning off the power while the reception is suspended, the frame synchronization is established from the received signal. Synchronization word detection unit for detecting a synchronization word necessary for the synchronization, a frame synchronization judgment unit for judging the synchronization / unsynchronization of the frame from the detection result of the synchronization word detection unit, and a frame synchronization control as a criterion of the synchronization / unsynchronization of the frame A frame synchronization protection stage number setting unit that sets a value of the number of protection stages that is a parameter for use, an aperture width setting unit that sets a value of an aperture width that is a frame synchronization control parameter serving as a criterion of frame synchronization / asynchronization, Correlation threshold setting for setting a correlation threshold value which is a parameter for frame synchronization control as a criterion of frame synchronization / asynchronization And an intermittent reception timing estimating unit for estimating the transition of the frame phase occurring during reception suspension of intermittent reception and estimating the frame phase at the start of the next reception, based on the estimated value of the frame phase at the start of the next reception A timing control unit that corrects a frame phase, and an aperture control unit that controls an aperture width and an opening position based on the aperture width set by the aperture width setting unit and the frame phase corrected by the timing control unit. With this arrangement, the power consumption in intermittent reception can be reduced.

Further, in the frame synchronization control device according to the present invention, as described above, the intermittent reception timing estimating unit stores the frame phase immediately before reception suspension in intermittent reception, and stores the next phase after reception suspension in that phase. Since the frame phase at the time of the next reception start is estimated by adding the frame phase transition during the reception suspension until the start of reception, the power consumption in the intermittent reception can be reduced.

Further, as described above, in the frame synchronization control device according to the present invention, the intermittent reception timing estimating unit calculates the transition of the frame phase during the reception suspension from the reception suspension to the next reception start as the reception time. Since it is obtained from the reception suspension time and the bit rate of the received signal, it is possible to reduce the power consumption in intermittent reception.

As described above, the frame synchronization control device according to the present invention further includes the reception pause / start interval calculation unit for correcting the reception pause time based on the past statistical value of the aperture opening position. In addition, it is possible to more accurately estimate the frame phase at the start of reception in intermittent reception, and to increase the probability of maintaining frame synchronization at the start of reception in intermittent reception.

As described above, the frame synchronization control device according to the present invention further includes at least the frame synchronization protection stage number setting unit, the aperture width setting unit, and the correlation threshold value setting unit according to the reception state. Since the synchronization state transition control unit for intermittent reception for changing any one of the setting values is provided, it is possible to more accurately estimate the frame phase at the start of reception in intermittent reception, and to perform frame synchronization at the start of reception in intermittent reception. This has the effect of increasing the probability of holding.

The frame synchronization control device according to the present invention
As described above, in a frame synchronization control device that intermittently receives a received signal and turns off the power during reception suspension, a synchronization word detection unit that detects a synchronization word necessary to establish frame synchronization from the reception signal; A frame synchronization determining unit that determines the synchronization / asynchronization of a frame based on the detection result of the synchronization word detection unit, and protection for frame synchronization that sets a value of a protection stage number that is a parameter for frame synchronization control that is a determination reference of the synchronization / asynchronization of the frame A stage number setting unit, an aperture width setting unit for setting an aperture width value which is a frame synchronization control parameter serving as a frame synchronization / asynchronization determination criterion, and a frame synchronization control parameter serving as a frame synchronization / asynchronization determination criterion A correlation threshold setting unit that sets a value of a correlation threshold that is a timing control unit that controls a frame phase, An aperture control unit that controls the aperture width and the opening position based on the aperture width set by the aperture width setting unit and the frame phase controlled by the timing control unit; and for intermittent reception that switches state transitions according to the reception state. Since the synchronization state transition control unit is provided, it is possible to increase the probability of maintaining frame synchronization at the start of reception in intermittent reception.

Further, as described above, in the frame synchronization control device according to the present invention, the intermittent reception synchronization state transition control unit may include at least the frame synchronization protection stage number setting unit, the aperture width according to the reception state. Setting part,
In addition, since any one of the setting values of the correlation threshold value setting unit is changed, an effect that the probability of maintaining frame synchronization at the start of reception in intermittent reception can be increased.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a first embodiment of the present invention.

FIG. 2 is a timing chart showing the operation of the first embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a second embodiment of the present invention.

FIG. 4 is a state transition diagram showing the operation of the second embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a third embodiment of the present invention.

FIG. 6 is a diagram illustrating statistical values of an aperture opening position according to the third embodiment of the present invention.

FIG. 7 is a block diagram illustrating a configuration of a conventional frame synchronization control device.

FIG. 8 is a block diagram showing a configuration of another conventional frame synchronization control device.

[Explanation of symbols]

1. Synchronization word detection unit, 2. Timing control unit, 3. Aperture control unit, 4. Frame synchronization protection stage number setting unit, 5.
Frame synchronization determination unit, 6 aperture width setting unit, 7 correlation threshold setting unit, 8 intermittent reception timing estimation unit, 9
Synchronous state transition control unit for intermittent reception, 10 reception pause / start interval calculation unit.

Claims (7)

[Claims] 1. A frame synchronization control device for intermittently receiving a reception signal and turning off the power during reception suspension, a synchronization word detection unit for detecting a synchronization word necessary for establishing frame synchronization from the reception signal, A frame synchronization determination unit that determines the synchronization / asynchronization of the frame from the detection result of the synchronization word detection unit; A stage number setting unit, an aperture width setting unit for setting an aperture width value which is a frame synchronization control parameter serving as a frame synchronization / asynchronization determination criterion, and a frame synchronization control parameter serving as a frame synchronization / asynchronization determination criterion A correlation threshold value setting unit that sets a correlation threshold value that is a A timing estimation unit for intermittent reception for estimating a frame phase at the start of the next reception, a timing control unit for correcting a frame phase based on an estimated value of the frame phase at the start of the next reception, and the aperture width setting. A frame synchronization control device comprising: an aperture control unit that controls an aperture width and an opening position based on an aperture width set by a unit and a frame phase corrected by the timing control unit. 2. The intermittent reception timing estimating unit stores a frame phase immediately before reception suspension in intermittent reception,
2. The frame synchronization control device according to claim 1, wherein the frame phase at the start of the next reception is estimated by adding a frame phase transition during the reception pause from the reception pause to the next reception start to the phase. 3. The intermittent reception timing estimating unit obtains a frame phase transition between reception suspension from reception suspension to the next reception start from a reception time, a reception suspension time, and a bit rate of a reception signal. 3. The frame synchronization control device according to claim 2, wherein 4. The frame synchronization control device according to claim 3, further comprising a reception pause / start interval calculation unit that corrects the reception pause time based on a past statistical value of the aperture opening position. 5. An intermittent reception synchronization state transition for changing at least one of the frame synchronization protection stage number setting unit, the aperture width setting unit, and the correlation threshold value setting unit according to a reception state. The frame synchronization control device according to any one of claims 1 to 4, further comprising a control unit. 6. A frame synchronization control device for intermittently receiving a reception signal and turning off the power during reception suspension, a synchronization word detection unit for detecting a synchronization word necessary for establishing frame synchronization from the reception signal, A frame synchronization determination unit that determines the synchronization / asynchronization of the frame from the detection result of the synchronization word detection unit; A stage number setting unit, an aperture width setting unit for setting an aperture width value which is a frame synchronization control parameter serving as a frame synchronization / asynchronization determination criterion, and a frame synchronization control parameter serving as a frame synchronization / asynchronization determination criterion A correlation threshold value setting unit that sets a correlation threshold value that is: a timing control unit that controls a frame phase; An aperture control unit that controls the aperture width and the opening position based on the aperture width set by the aperture width setting unit and the frame phase controlled by the timing control unit; and for intermittent reception that switches state transitions according to the reception state. A frame synchronization control device comprising: a synchronization state transition control unit. 7. The intermittent reception synchronization state transition control unit,
7. The frame synchronization control according to claim 6, wherein a setting value of at least one of the frame synchronization protection stage number setting unit, the aperture width setting unit, and the correlation threshold value setting unit is changed according to a reception state. apparatus.