Convolutional coding combined with continuous phase modulation
Abstract
Background theory and specific coding designs for combined coding/modulation schemes utilizing convolutional codes and continuous-phase modulation (CPM) are presented. In this paper the case of r = 1/2 coding onto a 4-ary CPM is emphasized, with short-constraint length codes presented for continuous-phase FSK, double-raised-cosine, and triple-raised-cosine modulation. Coding buys several decibels of coding gain over the Gaussian channel, with an attendant increase of bandwidth. Performance comparisons in the power-bandwidth tradeoff with other approaches are made.
- Publication:
-
IEEE Transactions on Communications
- Pub Date:
- January 1985
- Bibcode:
- 1985ITCom..33...20P
- Keywords:
-
- Convolution Integrals;
- Error Correcting Codes;
- Frequency Shift Keying;
- Phase Modulation;
- Phase Shift Keying;
- Signal Encoding;
- Bandwidth;
- Channel Noise;
- Performance Prediction;
- Power Gain;
- Communications and Radar