Error coding communication terminal interface

Details Error coding communication terminal interface Error coding communication terminal interface

1975-11-24

1977-12-13

Olms, Douglas W.

179 15AE, H04J 302

Patent

active

040630382

ABSTRACT:
A communication terminal interface accepts, on different channels, information in a plurality of formats for communication purposes over a communication link which may be a TDMA satellite link. Each channel is accepted by a different interface unit which serves to format the information for communication over the system. This unit includes a compression-expansion buffer memory for allowing information received at a receive rate R.sub.s to be multiplexed and transmitted at a transmission rate T.sub.s which may be many times higher than the receive rate. In addition some units may include forward acting error correcting coding selected to provide the necessary corrected bit error rate for the type of information accepted by the unit and the capacity of the communication link over which the information is to be transmitted. The transmitter may employ differential encoding. To avoid increasing the error rate, which would normally result from this type of encoding, the encoded data is interleaved at the transmit side such that adjacent errors, after de-interleaving, on the receive side, are sufficiently displaced such that they may be corrected by the error decoding.

REFERENCES:
patent: 3303333 (1967-02-01), Massey
patent: 3534264 (1970-10-01), Blasbalg et al.
patent: 3707680 (1972-12-01), Gabbard et al.
patent: 3825899 (1974-07-01), Haeberle et al.
patent: 3838221 (1974-09-01), Schmidt et al.
"IBM Technical Disclosure Bulletin," by Clark & Frey, vol. 11, No. 8, Jan. 1969, pp. 910 & 911.
"A TDM System for Asynchronous High-Rate Telemetry," by Appel & Pardoe, APL Technical Digest, Oct. 1971, pp. 2-12.

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