Error correction encoding system

Claim 2

An error correction encoding method for vehicle data communication with half duplex and/or full duplex function, said error correction encoding method supervising an error rate of received data, whereby adaptively changing an error correcting code and effecting transmission and reception, comprising the steps of: transmitting data yielded by encoding transmission data with use of a designated error correcting code to a communication channel; a step of decoding said data received from the communication channel with use of the same error correcting code as that of a transmitting side while detecting error information involved in said received data; receiving said error information from a remote transmitting side for thereby selecting an adaptive error correcting code; and retransmitting erroneous data with use of said selected error correcting code while designating said error correcting code as said error correcting code for use in said step.

Claim 3

An error correction encoding method according to Claim 1, wherein said transmission data is encoded for each frame unit, a plurality of said frames are put together into a block and transmitted to the communication channel while any error involved in received block data is detected for each frame whereby on frame error rate is estimated to select an error correcting code.

Claim 4

An error correction encoding method according to Claim 2, wherein said error involved in each frame belonging to the received data is detected based on a cyclic code.

Claim 5

An error correction encoding method according to Claim 1, wherein a bit error rate of the received block data is detected, said bit error rate and a specified channel error rate are compared to decide whether the received data is erroneous or not, while said received data is encoded with use of an error correcting code selected on the basis of said bit error rate.

Claim 6

A vehicle data communication apparatus with half duplex and/or full duplex function with use of the error correction encoding method for changing the error correcting code in response to the error rate of the received data and thereby effecting transmission and reception, comprising: (1) a transmitting part including; an error correcting code memory unit (11B) for storing a plurality of types of the error correcting codes (E1 to E4); a receiver (5) for receiving error information involved in the reception data transmitted from a receiving part of a remote apparatus; a decoder (6) for decoding an output from said receiver (5); an encoder (2) for taking out an adaptive error correcting code from said error correcting code memory unit (11B) based on the error information being an output from said decoder (6), whereby encoding data being delivered from said transmitting terminal unit (1); and a transmitter (3) for transmitting said encoded data to a communication channel (4), and said vehicle data communication apparatus further comprising: (2) a receiving side including; a receiver (15) for receiving data transmitted from a transmitting part of the remote apparatus; a decoder (16) for decoding an output from said receiver (15) with use of the same error correcting code as that of the transmitting side and delivering it to the receiving terminal unit (8), while detecting any error involved in the received data; an encoder (2) for encoding error information delivered from said decoder (16); and a transmitter (3) for transmitting an output from said encoder (2) to the transmitting part of the remote apparatus.

Claim 7

A vehicle data communication apparatus with half duplex and/or full duplex function with use of the error correction encoding method for changing the error correcting code in response to the error rate of the received data and thereby effecting transmission and reception, comprising: (1) a transmitting part including; an error correcting code memory unit (11B) for storing a plurality of types of the error correcting codes (E1 to E4); a receiver (5) for receiving error information involved in the reception data transmitted from a receiving part of a remote apparatus; a decoder (6) for decoding an output from said receiver (5); an encoder (2) for taking out an adaptive error correcting code from said error correcting code memory unit (11B) based on the error information being an output from said decoder (6), whereby encoding data being delivered from said transmitting terminal unit (1); and a transmitter (3) for transmitting said encoded data to a communication channel (4), and said vehicle data communication apparatus further comprising: (2) a receiving side including; a receiver (15) for receiving data transmitted from a transmitting part of the remote apparatus; a decoder (16) for decoding an output from said receiver (15) with use of the same error correcting code as that of the transmitting side and delivering it to the receiving terminal unit (8), while detecting any error involved in the received data; an encoder (2) for encoding error information delivered from said decoder (16); and a transmitter (3) for transmitting an output from said encoder (2) to the transmitting part of the remote apparatus.

Claim 8

A vehicle data communication apparatus according to Claim 5, wherein said encoder (2) in the transmitting part encodes data for each frame unit and puts together a plurality of frames into a block, while said decoder (16) on the receiving side processes any error involved in the received data for each frame unit and detects the error information involved to said received data as a frame error rate.

Claim 9

A vehicle data communication apparatus according to Claim 6, wherein said receiving part has a memory part for storing a type code of the error correcting code and an error correcting code selector (10A) for selecting a type code of the error correcting code based on the detected error information, and said receiving part transmits said type code of the selected error correcting code and an error frame number to the remote transmitting part.

Claim 10

A vehicle data communication apparatus according to Claim 6, wherein said transmitting part has an error correcting code selector (10A) for estimating a frame error rate from error frames to select an error correcting code, whereby an error frame number is transmitted from the receiving part to the remote transmitting part.

Claim 11

A vehicle data communication apparatus according to Claim 5, wherein said receiving part has a burst length measuring part (7B) for detecting a burst length and an error-free length from the error detector signal involved in the received data, whereby a bit error rate of received block data and a specified channel error rate are compared to decide whether the received data is erroneous or not, while the error correcting code is selected in response to said bit error rate.