| US 7,333,571 B2 | ||
| Reduced complexity coding system using iterative decoding | ||
| Marvin K. Simon, La Canada, Calif. (US); and Dariush Divsalar, Pacific Palisades, Calif. (US) | ||
| Assigned to California Institute of Technology, Pasadena, Calif. (US) | ||
| Filed on Apr. 23, 2002, as Appl. No. 10/131,611. | ||
| Claims priority of provisional application 60/285903, filed on Apr. 23, 2001. | ||
| Prior Publication US 2003/0053557 A1, Mar. 20, 2003 | ||
| Int. Cl. H04L 27/22 (2006.01); H04L 27/06 (2006.01); H04L 27/20 (2006.01) | ||
| U.S. Cl. 375—329 [375/341; 375/308] | 34 Claims |
| 1. A method of encoding, comprising:
performing a first outer encoding on a first portion of an input sequence of bits to produce first outer encoded bits;
performing a second outer encoding on a second portion of the input sequence of bits to produce second outer encoded bits;
bit interleaving said first outer encoded bits to produce first interleaved encoded bits;
bit interleaving said second outer encoded bits to produce second interleaved encoded bits;
performing a modified FQPSK modulation on said first interleaved encoded bits and said second interleaved encoded bits to
produce I and Q waveform sequences, wherein said performing the modified FQPSK modulation realizes a modulation with memory,
wherein said performing the modified FQPSK modulation includes:
performing an I-channel recursive encoding on the first interleaved encoded bits to generate I encoder outputs;
performing a Q-channel recursive encoding on the second interleaved encoded bits to generate Q encoder outputs;
performing a signal mapping on the I encoder outputs and the Q encoder outputs to generate said I and Q waveform sequences;
wherein said I and Q waveform sequences are continuous in time.
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