Citation
Abstract
Based on a representation of Feher-patented quadrature-phase-shift keying (FQPSK) as a trellis-coded modulation, this article continues the investigation of the potential improvement in power e–ciency obtained from the application of simple (small number of states) outer codes to form a concatenated coding arrangement with iterative decoding. For the additional two of the three concatenation configurations previously suggested, specific numerical results are presented for rate-1/2 outer codes. These results are then compared with the coding gains previously reported for the first of the three configurations, all of which are based on using a reduced-complexity FQPSK receiver. Finally, in an attempt to trade powere–ciency improvement with the bandwidth expansion associated with the outer code rate, we consider the performance of the coded FQPSK system using rate-3/4 outer codes.
Keywords
Details
- Volume
- 42-146
- Published
- August 15, 2001
- Pages
- 1–7
- File Size
- 101.2 KB