Adaptive error encoding in multiple access systems

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

1978-08-10

1982-11-02

Stewart, David L.

Multiplex communications

Wide area network

Packet switching

370 79, 370 84, 370104, H04J 316

Patent

active

043577008

ABSTRACT:
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 maintain error-free transmission under varying noise conditions. Adjustments are made on a path selective and channel 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 unprotected forms. A predetermined portion of each channel containing 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 coding is transmitted in two contiguous channels along with information in the first channel explicitly distinguishing the protected format. This format-distinguishing information occupies the space allotted in the unprotected format for designating the data destination. The destination of protectively encoded data is explicitly designated in a separate predetermined space in the associated double-channel slot.

REFERENCES:
patent: 2962213 (1960-11-01), Namian
patent: 3207851 (1965-09-01), Fukinuki
patent: 3591722 (1971-07-01), Palsa
patent: 3700820 (1972-10-01), Blasbalg
patent: 4009344 (1977-02-01), Flemming
patent: 4047151 (1977-09-01), Ryobeck
Ericsson Technics, No. 4, 1975, "Techniques for Introducing Error Correcting Codes . . . " by Ryobeck et al.

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