PERFORMANCE ANALYSIS OF TRELLIS CODED MODULATION SCHEMES WITH ASYMMETRIC QPSK IN LAND MOBILE SATELLITE FADING CHANNELS

Document Type : Original Article

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Egyptian Armed Forces.

Abstract

ABSTRACT
This paper is concerned with evaluating the performance of trellis coded modulation
schemes with asymmetric QPSK when transmitted through a land mobile satellite channel.
The channel exhibits fading and shadowing as well as additive white Gaussian noise. Fading
and shadowing cause both envelope and phase variations of the received signal. However, it is
assumed that the effect of the fading on the phase of received signal is fully compensated
using a pilot tone calibration technique. The paper provides an upper bound of pairwise error
probability of TCM schemes with both asymmetric and symmetric QPSK modulations.
Numerical results show that TCM with asymmetric QPSK provides better performance in
terms of bit error probability over TCM with symmetric constellations in Nakagami-m
distribution fading channel.

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