Citation
Abstract
Based on a representation of Feher-patented quadrature-phase-shift keying (FQPSK) as a trellis-coded modulation, this article investigates the potential improvement in power e–ciency obtained from the application of simple (a small number of states) outer codes to form a concatenated coding arrangement with iterative decoding. Several possible configurations for the concatenation are suggested, and specific numerical results are presented for one of these in order to demonstrate the large coding gains that are achievable even when using a reducedcomplexity FQPSK receiver. The end result of these investigations is a system that has application in scenarios requiring a high degree of both power and bandwidth e–ciency.
Keywords
iterative decoding
turbo codes
bandwidth eficient modulation
FQPSK
Details
- Volume
- 42-145
- Published
- May 15, 2001
- Pages
- 1–17
- File Size
- 246.3 KB