Citation
Abstract
We examine several properties of n-pulse M-slot multipulse pulse-position modulation (MPPM) [6] on discrete memoryless channels (DMCs). First, we derive the maximum-likelihood decision rule and an exact expression for the symbol-error rate when n ≥ 1. This extends work on the Poisson channel which considered n = 1 [4], n = 2 [15], and which bounded the symbol-error rate for n ≥ 1 [3]. Next, we present an expression for the capacity of MPPM and show how to choose n ∈ {1,2,···} and M ∈ {2,3,···} to maximize capacity when average power, peak power, and bandwidth constraints are simultaneously imposed. The capacity of MPPM can be significantly higher, up to two times, than conventional pulseposition modulation (PPM) in a high average-power region for which the optimal M for conventional PPM is approximately 16 or lower. In lower average-power regions where the optimal M is higher, MPPM offers a negligible increase in capacity.
Keywords
Details
- Volume
- 42-161
- Published
- May 15, 2005
- Pages
- 1–13
- File Size
- 179.1 KB