Communications systems and methods employing code rate partition

Details Communications systems and methods employing code rate partition Communications systems and methods employing code rate partition

1997-03-27

1999-08-17

Elmore, Reba I.

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

714746, 714708, 714758, 714750, 714752, 714704, 714754, 714781, 370321, 370326, 370350, 371 30, 371 55, 371 377, 371 341, 371 3701, 371 51, 371 3703, 371 3707, 371 43, H03M 1300

Patent

active

059387874

ABSTRACT:
Information is processed to produce a plurality of information symbols. The plurality of information symbols are encoded according to a concatenation of an error correction code and a nonorthogonal modulation code to produce a modulated communications signal. The modulated communications signal is communicated over a communications medium, and process the communicated modulated communications signal is processed to produce information. Preferably, the information symbols are encoded according to an error correction code, preferably a convolutional code, to produce a plurality of coded symbols. The plurality of coded symbols are preferably interleaved to produce a plurality of interleaved coded symbols. The interleaved coded symbols are then modulated according to a nonorthogonal code to produce the modulated communications signal. Preferably, the coded symbols are modulated according to a proper subset of a one of a Nordstrom-Robinson code, a Reed-Muller code, or a Kerdock code, the proper subset being operable to produce a modulated communications signal from a signal set such that the communications signal noncoherently demodulates to produce a unique output for each signal in the signal set, and the communications signal processing includes noncoherent demodulating to noncoherently demodulate the communicated modulated communications signal.

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