JPH01293726A - Selective coding system in radio communication system - Google Patents

Abstract

PURPOSE:To effectively use a coding system and to improve the transmission efficiency of a data signal by transmitting and receiving data by judging error status in a line and selecting respective coding means and decoding means which are optimum for the line. CONSTITUTION:At a calling station, a transmitting system is actuated by the control of a control part 11, and a line status signal is transmitted from an antenna 1 through a coder 6 for correcting one error and a transmitting part 3 to a called station. At the called station, the line status signal is received at the antenna 1, and the received line status signal is taken through a receiver part 4 and a decoder 9 for correcting one error into the control part 11. the control part 11 judges the existence of an error in the corrected signal and transmits a switching information signal from the antenna 1 through the coder 6 and the transmitting part 3 to the calling station. The calling station control part 11 takes in the received signal, judges whether the information is detected information or corrected information, switches to the sides of a coder 7 for detecting one error and a one error decoder 8 when the information is the detected information, and switches to the sides of the coder 6 and the decoder 9 when the information is the corrected information.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to an improvement of a selective coding method in a wireless communication system consisting of a plurality of calling stations and called stations.

Prior Art> First, a selective coding method in a conventional wireless communication system will be explained with reference to FIG.

In FIG. 4, 21 is a transmitting and receiving antenna, 22 is a transmitting and receiving switching unit, 23 is a transmitting unit, 24 is a receiving unit,
25 is an encoder, 26 is an encoder, 2F is a control section, and So is an antenna switching control signal.

A redundant component is added to the data signal by the encoder 25 of the calling station, and the data signal is transmitted through the antenna 21 via the transmitter 23. The called station receives this signal through the antenna 21 at the receiving section 24, and is further subjected to error correction by the decoder 26 to remove redundant components.

<Problems to be Solved by the Invention> In the conventional method described above, for example, if the encoder performs coding for one-error correction, the redundant component added for error correction when almost no errors occur on the line. It will be wasted. Conversely, if an error occurs on the line that exceeds the error correction capability of the encoder, it is necessary to further increase the correction capability by adding redundant components to the data signal in order to correct this error. As mentioned above, in conventional fixed encoding systems, redundant components are wasted or insufficient, which may result in insufficient effective use of the encoding system depending on line conditions, and the problem is that the code transmission efficiency decreases. was there.

The present invention has been made in view of these problems, with the aim of making effective use of the encoding method and improving the transmission efficiency of data signals.

<Means for Solving the Problems> In order to achieve the above object, the present invention transmits and receives line status signals using encoding means and decoding means with the highest correction ability before transmitting and receiving data signals. , determines the error status of the line from this signal, selects the one most suitable for the communication channel from among a plurality of encoding means and decoding means with different detection and correction abilities, and transmits and receives data signals. That's what I do.

Function: The error status of the line is predicted to some extent from the transmission/reception status of the line status signal, and the encoding and decoding means most suited to the communication channel are selected according to this result, so it is possible to avoid adding too much or too little redundant component. It is done without.

<Example> Next, one embodiment shown in the drawings will be described.

FIG. 1 is a block diagram of radio equipment constituting the wireless communication system of the present invention, FIG. 2 is a 70-chart showing the operating procedure, and FIG. 3 is a time chart.
is an antenna for transmitting and receiving, 2 is an antenna switching unit for switching between transmission and reception, 3 is a transmitting unit, 4 is a receiving unit, 5 is an encoder switching unit, 6 is an encoder for error correction, and 7 is an error detection unit. 8 is a decoder for error detection, 9 is a decoder for error correction, 10 is a decoder switching section, 11 is a control section, Sl is an antenna switching control signal, and Sl is an encoder switching The control signal, S, is a decoder switching control signal, S, is a line status signal, S is a switching information signal, S
6 is a data signal. The operation will be explained below according to FIGS. 2 and 3.

First, the antenna switching unit 2 is switched to the transmitting side by the antenna switching control signal S from the control unit 11 of the calling station, and the encoder switching unit 5 is switched to the transmitting side by the encoder switching control signal S2. The line status signal S is then switched to the encoder 6 (11).The line status signal S, passes through the encoder 6 for error correction, passes through the transmitter WS3, and is transmitted by the antenna 1 to the called station.

This signal S, is received by the antenna 1 of the called station, and the antenna switching control signal S1' (hereinafter referred to as
Signals from the called station are shown with a ° mark. ) by the receiving section 4
The line status signal S,° is corrected by the 1-error correction decoder 9, and is sent to the control unit 11 by the decoder switching control signal S3'. The control unit 11 determines whether or not there is an error in this corrected line status signal S4°, and if there is no error, the decoder switching control signal S,
1, the decoder 8 is switched to the one error detection decoder 8, and if there is an error, it remains in the one error correction decoder 9.

The switching information signal S brought about by this judgment,
l is switched to the 1 error correction encoder 6 by the encoder t7J') switching control signal S2 of the called station, passes through the encoder 6, passes through the transmitter 3, and is transmitted from the antenna 1 to the calling station. Sent. and the received switching information signal S
, is sent to the control unit 11 via the receiving unit 4 and the 1-error correction decoder 9 by the calling station's antenna switching control ill signal S and the decoder switching control signal Sl. Here, detection information or correction information is cut off by '1' by this switching information signal S, and if it is detection information, it is cut by '1' by encoder switching control signal S2 and decoder switching control signal S.
It is switched to the side of the encoder 7 for error detection and the decoder 58 for 1 error detection, and if it is correction information, it is switched to the side of the encoder 6 for 1 error correction and the decoder 9 for V1 error correction.

In addition, in FIG. 3, the L level of the signal S1 indicates the receiving state,
The H level indicates the transmission state, the signals S2 and S, the high level indicates the application of detection coding, and the H level indicates the application of correction coding.

In this way, the calling station selects either the 1-error correcting encoder 6 or the 1-error detecting encoder 7 depending on the error status of the line, and the data signal S6 is It will be transmitted via the selected encoder 6 or 7. In addition, the called station which received this has already switched 1 error detection decoder 8h and 1 error correction decoder r59.
The signal is decoded using one of these methods, and data signals S and l are obtained.

Note that the encoding means and decoding means in this invention are not limited to the one-error correction code and one-error detection code as in the above embodiments.

<Effects of the Invention> As is clear from the embodiments described above, according to the selective coding method in the wireless communication system of the present invention, when there are relatively many fluctuations in line errors, a code suitable for the time and place can be selected. You can choose the conversion method. Therefore, it is possible to optimally allocate redundant components through encoding, and there is no waste or shortage of redundant components unlike in conventional fixed-type systems, and overall data transmission efficiency can be improved. It also becomes possible to shorten the time.

[Brief explanation of the drawing]

tjS1 is a block diagram of radio equipment according to an embodiment of the present invention, Fig. 2 is a 70-chart showing the operating procedure, Fig. 3 is a time chart, and @4 is a diagram of conventional radio equipment. FIG. 3... Transmission section, 4... Receiving section 5... Encoder switching section, 6... 1 Error correction encoder, 7... 1: P, ri detection encoder, 8. ...1 error detection decoder, 9...1i! ! % error correction decoder, 10...Decoder switching unit, 11...Control unit %S2...Code 4 switching control signal S,...Decoder switching control ij signal, S,...・
Line status signal, S,...Switching information signal S,...
・Data signal

Claims (1)

[Claims] 1. A wireless communication system between radio equipment equipped with a control means, an encoding means, a decoding means, and a transmitting/receiving unit, including a plurality of encoding means and decoding means with different detection and correction abilities, and It is equipped with a switching unit that switches between each encoding means and decoding means, and before transmitting and receiving data signals, it transmits and receives a line status signal using the encoding means and decoding means with the highest correction ability, and detects errors in the line from this signal. A selective encoding method in a wireless communication system, characterized in that the situation is judged, and the one most suitable for the communication channel is selected from each encoding means and decoding means to transmit and receive data signals.