JP2605399B2 - Auxiliary signal transmission circuit - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary signal transmission circuit in a digital multiplex transmission line, and more particularly to an auxiliary signal transmission circuit most suitable for digital multiplex transmission using a digital wireless communication device. .

[Prior Art] FIG. 2 (a) is a block diagram showing an example of a conventional auxiliary signal transmission circuit. As the modulation / demodulation method, a 16QAM modulation / demodulation method will be described as an example.

At the transmitting end, a set of baseband signal sequences composed of a predetermined N / 2 columns among N = 2m (m is a natural number) input baseband signal sequences is transmitted to a P-channel and a Q-channel, respectively. And the P channel and Q
The auxiliary transmission signal is multiplexed in synchronization with the error correction code blocks of both baseband sequences of the channel.

That is, in the multiplexing circuit 101 shown in FIG.
The auxiliary transmission signal 7 is multiplexed and error-correction-coded while synchronizing the transmission signals 1p and 1q of the P-channel and the Q-channel to be error-correction-coded with the block of the error-correction code. Is transmitted as a modulation output. FIG. 2B shows an example of the multiplexed transmission signal at the transmitting terminal station.

As shown in FIG. 2 (b), the transmission signal has two transmission signal sequences for each of the P channel and the Q channel, and the transmission signal sequence includes an error correction code block.
Ap and Aq are multiplexed with auxiliary transmission signals Bp and Bq.

In the regenerative relay station, error correction decoding is performed by the error correction circuits 102p and 102q on the multiplexed input signals 3p and 3q, and the decoded multiplexed signal 4p
And 4q are output. The auxiliary signal separation / insertion circuit 103 synchronizes the multiplexed signals 4p and 4q with the block of the error correction code inserted by the multiplexing circuit 101,
Separating the auxiliary transmission signal 81 in the multiplexed signals 4p and 4q,
A new auxiliary transmission signal 82 is inserted.

The error correction coding circuits 104p and 104q perform error correction coding on the multiplexed signals 5p and 5q after the auxiliary transmission signal 8 is separated or inserted, and perform the error correction coded multiplexed signals 6p and 6q. Is transmitted as a modulation output.

[Problems to be Solved by the Invention] In the conventional auxiliary signal transmission circuit described above, in the separation and insertion circuit of the auxiliary transmission signal in the regenerative repeater station, the error correction decoding code for the transmission signal sequence of both the P channel and the Q channel is used. However, there is a disadvantage that the circuit configuration of the error correction decoding circuit and the error correction encoding circuit becomes large in scale because the coding must be performed.

Means for Solving the Problems The present invention has been made in view of the above points, and has as its object to reduce the circuit scale of an error correction decoding circuit and an encoding circuit in a reproduction relay station. In order to achieve the above, a time slot in which an auxiliary transmission signal to be separated by the regenerative relay station is included in a baseband signal of a predetermined channel in the baseband signal sequence of both the P-channel and the Q-channel constituted by the baseband signal sequence. A multiplexing circuit that concentrates on the signal sequence is provided at the transmitting terminal, and an error correction decoding circuit that performs error correction code decoding only on the baseband signal sequence of a predetermined channel, and an error correction inserted by the multiplexing circuit. Auxiliary transmission that separates an auxiliary transmission signal of a baseband signal sequence of a predetermined channel in synchronization with a code block and inserts a new auxiliary transmission signal A signal extraction / insertion circuit and an error correction coding circuit for performing error correction coding only on a baseband signal sequence of a predetermined channel are provided in the reproduction relay station.

Examples Hereinafter, the present invention will be described with reference to the drawings.

FIG. 1A is a diagram showing an embodiment of an auxiliary signal transmission circuit according to the present invention. The 16QAM modulation / demodulation method will be described as the modulation / demodulation method.

In the transmitting terminal station, a set of baseband signal sequences composed of predetermined N / 2 columns of N = 2m (m is a natural number) input baseband signal sequences are respectively assigned to a P channel and a Q channel. And the P channel and Q
The auxiliary transmission signal is multiplexed in synchronization with the error correction code blocks of both baseband sequences of the channel.

That is, the multiplexing circuit 10 shown in the block diagram of FIG.
In 1a, the auxiliary signal 7 is multiplexed and error-correction-coded while synchronizing the transmission signals 1p and 1q of P-channel and Q-channel which are error-correction-coded with the block of the error-correction code, and Transmit as modulation output. FIG. 1 (b) shows a multiplexed transmission signal sequence at the transmitting terminal.

As shown in FIG. 1 (b), the block of the error correction code
Ap and Aq are multiplexed into each transmission signal sequence 2 of two columns each of the P channel (2p) and the Q channel (2q). Further, the auxiliary transmission signals Bp and Bq are multiplexed on only one predetermined channel (the P channel in FIG. 1B).

In the regenerative relay station, of the multiplexed P-channel input signal 3P and the Q-channel input signal 3q,
Only the P-channel input signal 3p is subjected to error correction decoding by the error correction decoding circuit 102, and the decoded P-channel input signal 4p is supplied to the auxiliary transmission signal separation / insertion circuit 103a. . Auxiliary transmission signal separation and insertion circuit
103a separates the auxiliary transmission signal 81 in the multiplexed signal 4p by synchronizing the multiplexed signal 4p with the block of the error correction code inserted by the multiplexing circuit 101a of the transmitting side terminal, and newly performs auxiliary transmission. Insert signal 82. The error correction coding circuit 104 performs an error correction coding operation on the multiplexed signal 5p after the auxiliary transmission signal 8 is separated and inserted, and sends out the error-correction-coded multiplexed signal 6p as a modulation output.

The multiplexed input signal 3q of the Q channel in the regenerative relay station is given a predetermined delay time by the delay circuit 105 and output. The delay circuit is used to make the synchronous block position of the error correction code equal to that of the P channel. Therefore, the delay time of the delay circuit 105 is determined to be equal to the sum of the processing times of the error correction decoding circuit 102, the auxiliary transmission signal separation / insertion circuit 103a, and the error correction encoding circuit 104. As a result, the output multiplexed signal 6q has the same error correction code synchronization block position as that of the multiplexed signal 6p, and is transmitted as a modulated output similarly to the multiplexed signal 6p.

[Effects of the Invention] As described above, the present invention provides an auxiliary transmission signal separated by a regenerative relay station in a baseband signal sequence of both a P channel and a Q channel composed of a baseband signal sequence. A multiplexing circuit that concentrates incoming time slots on a baseband signal sequence of a predetermined channel is provided at the transmitting terminal, and an error correction decoding circuit that performs error correction code decoding only on the baseband signal sequence of the predetermined channel. An auxiliary transmission signal extracting and inserting circuit for separating an auxiliary transmission signal of a baseband signal sequence of a predetermined channel and inserting a new auxiliary transmission signal in synchronization with the block of the error correction code inserted by the multiplexing circuit; And an error correction coding circuit for performing error correction coding only on the baseband signal sequence of the channel Therefore, the transmitting end station concentrates the multiplexing of the auxiliary transmission signal on a predetermined one of the P channel and the Q channel, thereby reducing the circuit scale of the error correction decoding circuit and the encoding circuit in the reproduction relay station. It becomes possible to reduce.

[Brief description of the drawings]

FIG. 1 (a) is a block diagram showing an embodiment of an auxiliary signal transmission circuit according to the present invention, and FIG. 1 (b) is a block diagram of the transmission terminal station shown in FIG. 1 (a).
FIG. 2 (a) is a block diagram showing a conventional auxiliary signal transmission circuit, and FIG. 2 (b) is a diagram showing FIG. 2 (a). FIG. 10 is a signal diagram showing a multiplexed transmission signal sequence of a 16QAM modulation / demodulation method in a conventional transmission terminal station. 1 ... transmission signal 2 ... multiplex transmission signal 3 ... input signal 4 ... multiplex signal 5 ... multiplex signal 6 ... multiplex signal 7 ... auxiliary transmission signal 8 ... auxiliary transmission signal 101 ... Multiplexing circuit 101a Multiplexing circuit 102 Error correction decoding circuit 103 Auxiliary transmission signal separation / insertion circuit 103a Auxiliary transmission signal separation / insertion circuit 104 Error correction encoding circuit 105 Delay circuit

Claims (1)

(57) [Claims] 1. A base for both a P-channel and a Q-channel composed of a predetermined N / 2 baseband signal trains among N baseband signal trains of N = 2m (m is a natural number) to be input. The auxiliary transmission signal is multiplexed and transmitted in synchronization with the block of the error correction code of the band sequence, and the transmitting terminal and the receiving terminal perform error correction in the entire transmission signal sequence. In a transmission method that does not require error correction for the main signal in the baseband signal sequence of the P-channel and the Q-channel, a time slot in which the auxiliary transmission signal separated by the regenerative relay station is input. A multiplexing circuit for concentrating on a baseband signal sequence of a predetermined channel is provided in the transmitting terminal, and an error correction code decoding is performed only for the baseband signal sequence of the predetermined channel. And a new auxiliary transmission signal inserted by separating the auxiliary transmission signal of the baseband signal sequence of the predetermined channel in synchronization with the block of the error correction code inserted by the multiplexing circuit. An auxiliary transmission signal extraction / insertion circuit for performing error correction encoding for only the baseband signal sequence of the predetermined channel, and an error correction encoding circuit for performing error correction encoding on the base station. circuit.