JPH057192A - Digital radio transmission system - Google Patents

Abstract

PURPOSE:To realize a string conversion system in which each string signal has a relation of correspondence of 1:1 for a sender side and a receiver side. CONSTITUTION:A timing monitor circuit 107 at a sender side generates a control signal representing coincidence/dissidence between a timing pulse 8 for string conversion outputted from a 3-4 string conversion circuit 101 and a radio frame pulse 9 outputted from a 1st speed conversion circuit 102 and the signal is multiplexed by a multiplexer circuit 103. A timing detection circuit 109 of a receiver side recovers a string conversion timing pulse 13 from a control signal 12 extracted from a reception signal by a demultiplexer circuit 104 and a frame pulse 11 outputted from a frame synchronization detection circuit 108 and allows a 4-3 string conversion circuit to implement string conversion. As a result, the string signal 1-1 of the sender side is a string signal 7-1 surely on the receiver side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitting side for converting N columns of digital input signals into M columns for wireless transmission, and a receiver for converting M columns of digital input signals wirelessly received into N columns for reception and output. And a column conversion method.

[0002]

2. Description of the Related Art A digital radio having a transmitting side for converting N columns of digital input signals into M columns for wireless transmission and a receiving side for converting the M columns of digitally received signals received by radio into N columns for reception and output. A conventional column conversion method in a transmission system is, for example, as shown in FIG. Figure 2
The column conversion method when N = 3 and M = 4 is shown.

In FIG. 2A, on the transmitting side, 3-4
The column conversion circuit 110 converts the synchronized three columns of digital input signals (1-1 to 1-3) into four columns of digital signals (2-1.
To 2-4).

The first speed conversion circuit 111 multiplies the digital signals (2-1 to 2-4) by m / n times (n is an integer of 1 or more, in order to add a wireless overhead bit to the main data signal). m outputs a digital signal (3-1 to 3-4) converted into a speed of m ≧ n + 1).

Then, the multiplexing circuit 112 outputs digital signals (4-1 to 4-4) in which frame bits and the like are multiplexed to the speed-converted digital signals (3-1 to 3-4). This multiplexed digital signal (4-1 to 4-
4) is modulated and wirelessly transmitted.

Next, referring to FIG. 2B, on the receiving side,
The received and demodulated digital signals (4-1 to 4-4) are input to the frame synchronization detection circuit 108 and the separation circuit 113.

The frame synchronization detection circuit 108 establishes a wireless frame by digital signals (4-1 to 4-4) and outputs a frame pulse 11 indicating the frame structure.

Further, the separation circuit 113 separates the wireless overhead bits from the digital signals (4-1 to 4-4) according to the frame pulse 11, and the digital signal (where the wireless overhead bit arrangement section remains) ( 5
-1 to 5-4) are output.

The second speed conversion circuit 114 outputs digital signals (5-1 to 5-4) based on the frame pulse 11.
The digital signal (6-1 to 6) obtained by removing the overhead bit arrangement section from the
-4) is output.

Then, the 4-3 column conversion circuit 115 converts the four columns of digital signals (6-1 to 6-4) into three columns of digital signals (7-1 to 7-3) and outputs them.

[0011]

In the above-described conventional column conversion system, since the transmitting side and the receiving side independently perform the conversion operation, the input digital signal 1-1 of the transmitting side is the output digital signal 7- of the receiving side. There is a problem that it is not always output as 1, and it is unknown which of 7-1 to 7-3 (that is, there is uncertainty).

An object of the present invention is to have a one-to-one correspondence between each column signal on the transmitting side and the receiving side so that the input signal on the first column on the transmitting side becomes the output signal on the first column on the receiving side. An object of the present invention is to provide a digital wireless transmission system equipped with a column conversion system capable of maintaining the above.

[0013]

In order to achieve the above object, the digital wireless transmission system of the present invention has the following configuration. That is, the digital wireless transmission system of the first invention is a digital wireless transmission system for converting N columns of digital input signals into M columns for wireless transmission; the transmitting side converts N columns of digital input signals into M columns. And means for outputting a timing pulse indicating a unit of column conversion; m / n (n is 1 to add an overhead bit to the digital signal converted into the M columns.
A unit for converting into a digital signal of M columns having a speed of the above integer, m is an integer of m ≧ n + 1) times, and outputting a timing pulse of a radio frame which is a reference of the speed conversion; Means for monitoring a match / mismatch between the timing pulse shown and the timing pulse of the radio frame, and outputting a control signal indicating the match / mismatch;
Means for forming an overhead bit having the control signal or the like as an element and multiplexing the overhead bit with the speed-converted digital signal of M columns.

The digital radio transmission system of the second invention is a digital radio transmission system for converting a digitally received M-row digital input signal into N-rows and receiving and outputting them. Means for establishing wireless frame synchronization from a digital input signal and generating and outputting a frame pulse; separating overhead bits from the wirelessly received digital input signal of M columns according to the frame pulse, and leaving an overhead bit arrangement section Means for outputting a digital signal of the M columns and a control signal included in the overhead bits; and deleting the arrangement section of the overhead bits from the digital signal of the M rows with the arrangement section of the overhead bits left. The digital signal of M columns from which the arrangement section of Means for converting into a digital signal of M trains at a speed of n / m times in accordance with a frame pulse; means for reproducing and outputting a timing pulse for train conversion from the frame pulse and the control signal separated and extracted; Means for converting the digital signal of the above into the digital signal of N columns in accordance with the above-mentioned column conversion timing pulse;

[0015]

Next, the operation of the digital wireless transmission system of the present invention constructed as above will be described. In the present invention, the transmission side transmits the control signal that associates the timing of column conversion with the timing of the frame pulse by using the overhead bit. Then, the receiving side reproduces the timing pulse for column conversion from the control signal and the frame pulse to perform column conversion. As a result, the input signal in the first column on the transmitting side becomes the output signal in the first column on the receiving side, and a column conversion method is provided in which each column signal can maintain a one-to-one correspondence relationship between the transmitting side and the receiving side. It is possible to provide a digital wireless transmission system.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration of a transmitting side and a receiving side in a digital wireless transmission system according to an embodiment of the present invention.
It should be noted that the column conversion method in this embodiment is similar to the conventional example in that
= 3, M = 4.

In FIG. 1A, on the transmitting side, 3-4
The column conversion circuit 101 converts the synchronized digital input signals (1-1 to 1-3) of three columns into the digital signals (2-1) of four columns.
2-4) while outputting a timing pulse 8 indicating the unit of column conversion. In this embodiment, the timing pulse 8 is generated once every 4 bits.

The first speed conversion circuit 102 multiplies the digital signals (2-1 to 2-4) by m / n times (n is an integer of 1 or more, in order to add a wireless overhead bit to the main data signal). m outputs a digital signal (3-1 to 3-4) converted into a speed of m ≧ n + 1) and outputs a timing pulse 9 of a radio frame which is a reference of the speed conversion. The timing pulse 9 of this radio frame is generated, for example, once every 100 bits.

The timing monitoring circuit 107 monitors whether or not the timing pulses 8 and 9 match each other, and outputs a control signal 10 of H (high) level when they match and L (low) level when they do not match. That is, the control signal 10 is a signal that associates the column conversion timing with the frame pulse timing.

Then, the multiplexing circuit 103 forms radio overhead bits having the control signal 10 and frame bits as constituent elements in the speed-converted digital signals (3-1 to 3-4) and multiplexes them. Digital signal (4
-1 to 4-4) are output. The multiplexed digital signals (4-1 to 4-4) are modulated and wirelessly transmitted.

Next, referring to FIG. 1B, on the receiving side,
The received and demodulated digital signals (4-1 to 4-4) are input to the frame synchronization detection circuit 108 and the separation circuit 104.

The frame synchronization detection circuit 108 establishes a wireless frame by digital signals (4-1 to 4-4) and outputs a frame pulse 11 indicating the frame structure.

The demultiplexing circuit 104 demultiplexes the wireless overhead bits from the digital signals (4-1 to 4-4) according to the frame pulse 11, and arranges the control signal 12 and the overhead bits extracted from the overhead bits. Remains digital signal (5-
1-5-4) are output.

The second speed conversion circuit 105 outputs digital signals (5-1 to 5-4) based on the frame pulse 11.
The digital signal (6-1 to 6) obtained by removing the overhead bit arrangement section from the
-4) is output.

The timing detection circuit 109 reproduces and outputs a column conversion timing pulse 13 from the frame pulse 11 and the control signal 12.

The 4-3 column conversion circuit 106 converts the 4 columns of digital signals (6-1 to 6-4) into 3 columns of digital signals (7-1) in accordance with the column conversion timing pulse 13.
To 7-3) and output. Since the column conversion is performed at the same timing as the transmitting side, the digital input signal 1
-1 is output as the digital signal 7-1 in the first column on the receiving side, and the transparency is maintained.

[0027]

As described above, according to the digital wireless transmission system of the present invention, the transmitting side transmits the control signal for associating the column conversion timing with the frame pulse timing by using the overhead bit (the first bit). 1 invention). Then, the receiving side reproduces the column conversion timing pulse from the control signal and the frame pulse to perform the column conversion (second invention). As a result, the input signal in the first column on the transmitting side becomes the output signal in the first column on the receiving side, and a column conversion method is provided in which each column signal can maintain a one-to-one correspondence relationship between the transmitting side and the receiving side. There is an effect that a digital wireless transmission system can be provided.

[Brief description of drawings]

FIG. 1 is a configuration block diagram of a transmission side (a) and a reception side (b) in a digital wireless transmission system according to an embodiment of the present invention.

FIG. 2 is a configuration block diagram of a transmitting side (a) and a receiving side (b) in a conventional digital wireless transmission system.

[Explanation of symbols]

101 3-4 column conversion circuit 102 first speed conversion circuit 103 Multiplexing circuit 104 Separation circuit 105 Second speed conversion circuit 106 4-3 column conversion circuit 107 Timing monitoring circuit 108 frame synchronization detection circuit 109 Timing detection circuit

Claims (2)

[Claims] 1. A digital wireless transmission system for converting N columns of digital input signals into M columns for wireless transmission, wherein the transmitting side converts the N columns of digital input signals into M columns and at the same time performs column conversion unit. Means for outputting the timing pulses shown; m / n for adding overhead bits to the digital signal converted into the M columns
(N is an integer of 1 or more, m is an integer of m ≧ n + 1), and means for converting into a digital signal of M columns having a speed of multiple times and outputting a timing pulse of a radio frame which is a reference of the speed conversion; Means for monitoring the match / mismatch between the timing pulse indicating the unit of conversion and the timing pulse for the radio frame, and outputting a control signal indicating the match / mismatch; forming an overhead bit having the control signal or the like as an element; A digital radio transmission system comprising: a means for multiplexing a speed-converted digital signal of M columns. 2. A digital wireless transmission system for converting a digitally received M-row digital input signal into an N-row and receiving and outputting the same; the receiving side establishes wireless frame synchronization from the wirelessly received M-row digital input signal. And means for generating and outputting a frame pulse; separating the overhead bit from the digitally received M-column digital input signal according to the frame pulse, and converting the overhead bit into an M-column digital signal and an overhead bit while leaving the overhead bit arrangement section. Means for outputting a control signal included therein; the overhead bit placement section is deleted from the digital signal of the M column in which the overhead bit placement section is left, and the overhead bit placement section is removed.
The digital signal of the column is n / n according to the frame pulse.
means for converting into a digital signal of M columns at a speed of m times;
Means for reproducing and outputting a column conversion timing pulse from the frame pulse and the separated and extracted control signal;
Means for converting the speed-converted digital signal of M columns into the digital signal of N columns according to the column conversion timing pulse;