We analyze the performance of direct-sequence spread spectrum multiple access (DS/SSMA) systems, which use trellis coding with asymmetric phase shift keying (PSK) modulation. By designing the signal constellation to be asymmetric, we obtain a performance gain for the DS/SSMA system over the systems using the traditional symmetric signal constellation. Bit error probability analysis of the proposed system is carried out for some cases. Examples are given to show the performance gain due to the asymmetry of the signal constellation.
Bibliographical noteFunding Information:
This research was supported by Korea Science and Engineering Foundation (KOSEF) under Grant 961-0923-134-2, for which the authors would like to express their thanks. The authors also wish to thank the anonymous reviewers for their constructive and helpful comments and suggestions.
All Science Journal Classification (ASJC) codes
- Control and Systems Engineering
- Signal Processing
- Computer Vision and Pattern Recognition
- Electrical and Electronic Engineering