Adaptive error encoding in multiple access systems

Details Adaptive error encoding in multiple access systems Adaptive error encoding in multiple access systems

H - Electricity

04

B

363/11

H04B 7/185 (2006.01) H03M 13/35 (2006.01) H04J 3/00 (2006.01) H04L 1/00 (2006.01) H04L 1/02 (2006.01)

Patent

CA 1141493

ADAPTIVE ERROR ENCODING IN MULTIPLE ACCESS SYSTEMS Abstract Of The Disclosure In a time division multiple access (TDMA) system, for "multi-path" data communication via satellite repeater, the form of transmitted data is varied adaptively to main- tain error-free transmission under varying noise condi- tions. Adjustments are made on a path selective and chan- nel selective basis to protect only the most vulnerable data in specific transmission paths experiencing noise deterioration. Accordingly any multi-channel burst may contain channels of data in both protected and unprotec- ted forms. A predetermined portion of each channel con- taining data in unprotected format is used explicitly to designate the destination of the accompanying data and implicitly to distinguish the data format as unprotected. In protected format data including error protective cod- ing is transmitted in two contiguous channels along with information in the first channel explicitly distinguish- ing the protected format This format-distinguishing information occupies the space allotted in the unprotec- ted format for designating the data destination. The destination of protectively encoded data is explicitly designated in a separate predetermined space in the asso- ciated double-channel slot. MA9-77-019

331678

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