Multi-H phase-coded modulations with asymmetric modulation indexes

Abstract

Multi4 phase-coded modulation (MHPM) is a bandwidth efficient modulation scheme which offers substantial coding gain over conventional digital modulations. In this paper, a new concept of MHPM with asymmetric modulation indices corresponding to the bipolar data + 1 and -1 is considered, and numerical results of the minimum Euclidean distances for such asymmetric binary multi-h schemes are provided. It is shown that performance improvements on the error probability are gained over conventional MHPM with essentially the same bandwidth and a very slight modification in implementation. The upper bounds of error probabilities as functions of observation intervals and received Eb/No are also investigated in detail.

Asymmetric modulation indices in full/partial response multi-H phase-coded modulations with different phase pulse functions

“…It was also shown [ll] that essentially no bandwidth expansion and only a slight modification in implementation will be the result of this approach. However, the analysis and results [11] are only for full response systems with linear phase pulse functions. In this paper, the above concept of asymmetric indices for MHPM is extended in two directions.…”