JPH08307329A - Space diversity controller - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to realize a space diversity control device that has little influence on the main signal during direction search and always obtains the maximum combined output. [Structure] The combined output level detector (11) detects the combined level, and when the change in the in-phase combined signal level is large with respect to the same phase angle change, the change in the phase angle of the infinite phase shifter (8). The amount is set small, and the change amount of the phase angle of the infinite phase shifter (8) is set large when the change in the in-phase combined signal level is small with respect to the same change in the phase angle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-phase combining space diversity control device used in a PCM wireless device.

[0002]

2. Description of the Related Art A conventional in-phase synthesis space diversity (SD) controller is constructed as shown in FIG. 5, and its operation procedure is as shown in FIG.

In FIG. 5, 1 is a main antenna signal input terminal, 2 is a sub antenna signal input terminal, 3 is a main antenna receiving board, 4 is a sub antenna receiving board, 5 is a main antenna receiving board frequency converter, 6 is a sub-antenna reception board frequency converter, 7 is a microwave oscillator, 8 is an infinite phase shifter, 9 is an SD synthesizer, 10 is a synthesizer, 11 is an output level detector after synthesis, 12 is an SD controller, 13 is a demodulation board, 14
Is a demodulation output terminal.

In this conventional apparatus, the received wave received by the main antenna is input to the main antenna receiving board 3 and is then converted from a microwave signal to an IF band signal by the frequency converting section 5 and is then sent to the SD synthesizing board 9. Is entered. Similarly, the received wave received by the sub-antenna also receives the sub-antenna reception board 4
The frequency is converted by and is input to the SD synthesizer 9.

The received waves input to the SD synthesizer 9 in this manner are synthesized by the synthesizer 10. The output of the synthesizing unit 10 is provided with a post-synthesis output level detector 11, and the SD control unit 12 controls the infinite phase shifter 8 based on the information from the post-synthesis output level detector 11 to perform synthesis. Try to maximize the level.

At this time, the control procedure of the infinite phase shifter 8 is as shown in FIG.
It is moved in the “+” direction by only ° (step 201), the combined level detected by the combined output level detector 11 at that time is read and stored in the register A (step 202), and the phase is once returned to the original value ( Step 203), and further change by -N ° in the "-" direction (Step 20).
4), the combined level detected by the combined output level detector 11 at that time is read and stored in the register B (step 205), and the level of the register A and the level of the register B are compared (step 207). The infinite phase shifter 8 is changed to the side where the result level increases (step 208 or step 209) and the infinite phase shifter 8 is controlled.

However, in the in-phase synthesis, the level change with respect to the change of the infinite phase shifter 8 is small in the vicinity of the in-phase point where the level is maximum, and conversely, the level with respect to the change of the infinite phase shifter 8 is at the anti-phase point where the level is minimum. Has the property of increasing the rate of change.

Therefore, in order to search the changing direction of the infinite phase shifter 8, the angles changed in the "+" direction and the "-" direction are
Even when operating near the antiphase point, the effect on the main signal is reduced, so the value cannot be made too large. As a result, the level does not change even when the infinite phase shifter 8 is changed when searching for a direction near the inphase point. However, there was a problem that control stopped just before the common mode point.

If the angle of change is increased so that the direction can be searched for near the in-phase point, the level change can be increased near the in-phase point, and control closer to the in-phase point can be performed. However, there is a problem that a large level change occurs in the main signal at the time of searching for a direction near the anti-phase point, and at this time, the transmission quality deteriorates.

[0010]

As described above, since the rate of change of the in-phase synthesis level with respect to the angle change during the direction search differs between the in-phase point and the anti-phase point, the level change is small and the space diversity operation is incomplete. On the contrary, there is a problem that the level change is large and causes a large level change with respect to the main signal, which causes deterioration of the transmission quality. An object of the present invention is to solve this problem and to realize a space diversity control device that has a small influence on a main signal during direction search and always obtains a maximum combined output.

[0011]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a position between a first wireless input signal from a first antenna and a second wireless input signal from a second antenna. Phase means for giving a phase difference, in-phase combining means for in-phase combining the first wireless input signal and the second wireless input signal, and level detecting means for detecting the level of the synchronous combined signal combined by the in-phase combining means. Whether the phase difference should be increased or decreased by controlling the phase means to increase or decrease the phase difference by a certain fixed angle, determine the magnitude of the detection level of the level detection means resulting therefrom. And a phase difference control means for controlling the phase means further, the phase difference control means changes the synchronous composite signal level with respect to the same phase difference change. Reducing the fixed angle at large, said at the same change of the synchronization composite signal level to the phase difference change is small and having a fixed angle setting means for setting larger the fixed angle.

[0012]

According to the present invention, the fixed angle for changing the phase difference is increased when the change rate of the in-phase combined level is small, and the fixed angle for changing the phase difference is decreased when the change rate is large. As a result, the space diversity operation cannot be determined due to incompleteness, or the level change is too large to cause a large level change with respect to the main signal. It is possible to realize a space diversity control device that can obtain the combined output of

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A control device for in-phase synthesis space diversity (SD) according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a block diagram of an embodiment of the in-phase synthesis space diversity (SD) control device of the present invention.
2 and 3 are explanatory diagrams of the operation in the vicinity of the in-phase point and the anti-phase point of the in-phase synthesis space diversity (SD) control device of the present invention, and FIG. 4 is a flowchart showing the control procedure in the configuration of FIG. is there.

In FIG. 1, 1 is a main antenna signal input terminal, 2 is a sub antenna signal input terminal, 3 is a main antenna receiving board, 4 is a sub antenna receiving board, 5 is a main antenna receiving board frequency converter, 6 is a sub-antenna reception board frequency converter, 7 is a microwave oscillator, 8 is an infinite phase shifter, 9 is an SD synthesizer, 10 is a synthesizer, 11 is an output level detector after synthesis, 12 is an SD controller, 13 is a demodulation board, 14
Is a demodulation output terminal, and this circuit is basically the same as the circuit of the conventional example shown in FIG.

The operation of the apparatus will be described with reference to FIGS. 4, 2 and 3.

In order to search the changing direction of the infinite phase shifter, the present apparatus first detects the level after combining by the output level detector 11 after combining and stores this level (C in FIG. 2) in the register C. (Step 101).

Next, the I number is set to 1 (step 10
2), move the infinite phase shifter 8 by + N ° (step 10)
3). However, this N ° is set to a sufficiently small value that does not cause a large level change in the main signal even near the opposite phase point. Then, the combined output level detector 11 detects again the combined level and stores this level (D in FIG. 2) in the register D (step 104).

Next, the value of the post-combination level stored in the register D is compared with the value of the post-combination level stored in the register C, and it is determined whether or not the difference is equal to or more than a predetermined level (E in FIG. 2). (Step 105) If the level difference is not more than the predetermined level, add 1 to the I number (Step 10).
6) Return to step 103 and add the infinite phase shifter 8
Move N ° to detect the level difference.

If the level difference exceeds a predetermined level in step 105, the level of A in FIG. 2 stored in the register D is transferred to the register A and stored (step 107). Then return to (Step 10
8) Then, -IN ° (-2N ° in FIG. 2) is changed in the opposite direction (step 109). Then, the combined level (B in FIG. 2) at this time is detected and stored in the register B (step 110), and the infinite phase shifter 8 is returned to the original state (step 111).

After such a series of processing is completed, the levels stored in the registers A and B are compared (step 112). If A <B, the infinite phase shifter 8 is set to -IN ° ( In FIG. 2, it is fixed by changing by -2 N °) (step 113), and if A> B, the infinite phase shifter 8 is moved to + I.
This control is ended after changing and fixing only N ° (+ 2N ° in FIG. 2) (step 114). In Figure 2, points A and B
Since the point A has a higher level than the point A, it is judged that the point A is correct, and the infinite phase shifter 8 is moved to the point A ′ to finish.

The above-described explanatory view of FIG. 2 is an example in the case where the post-combination level change is relatively small compared to the phase change amount, such as near the in-phase point. The explanatory diagram of FIG. 3 is an example in the case where there is a large change in the post-combination level compared to the amount of phase change, such as in the vicinity of the reverse phase point.

In this example, when the infinite phase shifter 8 is first moved by + N ° (step 103), it is detected by the output level detector 11 after synthesis and stored in the register D (step 104).
Since the difference between the combined level (A in FIG. 3) and the combined level value stored in the register C is equal to or more than the predetermined level (E in FIG. 3) (step 105), the value stored in the register D in FIG. A level of A in step S107 is stored in the register A (step 107), and when the infinite phase shifter 8 is moved by -N ° (step 109), it is detected by the output level detector 11 after synthesis and stored in the register B (step S107). 110) The level after synthesis (B in FIG. 3) is compared (step 112), and the infinite phase shifter 8 is moved by + N ° or −N ° and fixed depending on its size (step 113 or step 114).

As described above, in the present invention, the infinite phase shifter 8 is moved by + N ° several times in the vicinity of the in-phase point to make a large movement,
Since the infinite phase shifter 8 can be moved small near the out-of-phase point, it is possible to search for a direction near the in-phase point, and also to cause a large level change in the main signal when searching for a direction near the in-phase point. Therefore, the control direction can be correctly determined without affecting the main signal during the direction search.

Further, as is apparent from the fact that the block diagram of the present invention, FIG. 1 and the block diagram of the prior art, FIG. 5, are basically the same, in the present invention, the conventional hardware is not particularly changed, It can be improved by changing the control procedure. Therefore, the conventional device can be used, which is economically realizable.

[0026]

As described above, in the present invention, a phase difference is provided between the first wireless input signal from the first antenna and the second wireless input signal from the second antenna, In-phase combining space diversity receiver that obtains space diversity effect by combining in-phase wireless input signal and second wireless input signal with each other, in order to increase in-phase combined signal level, phase angle should be increased or decreased In the space diversity control device that judges and processes
When the change in the in-phase combined signal level is large for the same phase angle change, the change amount of the phase angle is set small, and when the change in the in-phase combined signal level is small for the same phase angle change, the change amount of the phase angle is set. I set it large. As a result, the space diversity operation cannot be determined due to incompleteness, or the level change is too large to cause a large level change with respect to the main signal. It is possible to realize a space diversity control device that can obtain the combined output of

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of an in-phase synthesis space diversity control device of the present invention.

FIG. 2 is an explanatory diagram of a control operation in the vicinity of the in-phase point in the embodiment shown in FIG.

FIG. 3 is an explanatory diagram of a control operation in the vicinity of a reverse phase point in the embodiment shown in FIG.

4 is a flowchart showing a control procedure in the embodiment shown in FIG.

FIG. 5 is a block diagram of a conventional example of an in-phase synthesis space diversity control device.

FIG. 6 is a flowchart showing a control procedure in a conventional example.

[Explanation of symbols]

 1 Main Antenna Signal Input Terminal 2 Sub Antenna Signal Input Terminal 3 Main Antenna Receiver 4 Sub Antenna Receiver 5 Main Antenna Receiver Frequency Converter 6 Sub Antenna Receiver Frequency Converter 7 Microwave Oscillator 8 Infinite Phase Shift 9 SD synthesis board 10 Synthesis section 11 Output level detector after synthesis 12 SD control section 13 Demodulation board 14 Demodulation output terminal

Claims (1)

[Claims] 1. A phase means for providing a phase difference between a first wireless input signal from a first antenna and a second wireless input signal from a second antenna; and the first wireless input signal. In-phase combining means for in-phase combining with the second wireless input signal, level detecting means for detecting the level of the synchronous combined signal combined by the in-phase combining means, and a fixed angle having a phase difference by controlling the phase means. Phase difference control means for further controlling the phase means by judging whether the phase difference should be increased or decreased, by judging whether the detected level of the level detection means is increased or decreased by the increase or decrease. In the space diversity control device including, the phase difference control means reduces the fixed angle where the change in the synchronous combined signal level is large for the same phase difference change, One space diversity control apparatus characterized by having a fixed angle setting means for setting larger the fixed angle at the change of the synchronization composite signal level is small relative to the phase difference change.