In this chapter, combined trellis coded quantization/modulation scheme is introduced for wireless local loop environment modelled with realizable and practical medium parameters. The performance analysis of the combined system is carried out through the evaluation of signal-to-quantization noise ratio (SQNR) versus signal-to-noise ratio (SNR) curves and bit error probability upper bounds. Simulation studies confirm the analytical results. | Wireless Local Loops Theory and Applications Peter Stavroulakis Copyright 2001 John Wiley Sons Ltd ISBNs 0-471-49846-7 Hardback 0-470-84187-7 Electronic 4 Combined Trellis Coded Quantization Modulation over a Wireless Local Loop Environment O. N. Uçan M. Uysal and S. Paker Introduction In this chapter combined trellis coded quantization modulation scheme is introduced for wireless local loop environment modelled with realizable and practical medium parameters. The performance analysis of the combined system is carried out through the evaluation of signal-to-quantization noise ratio SQNR versus signal-to-noise ratio SNR curves and bit error probability upper bounds. Simulation studies confirm the analytical results. Fundamentals of Trellis Coded Modulation There is a growing need for reliable transmission of high quality voice and digital data for wireless communication systems. These systems which will be part of an emerging alldigital network are both power and band limited. To satisfy the bandwidth limitation one can employ bandwidth efficient modulation techniques such as those that have been developed over the past several years for microwave communication systems. Examples of these are multiple phase-shift keying MPSK quadrature amplitude modulation QAM and varius forms of continous phase frequency modulation CPM . In the past coding and modulation were treated as separate operations with regard to overall system design. In particular most earlier works on coded digital communication systems are independently optimized 1 conventional block or convolutional coding with maximized minimum Hamming distance 2 conventional modulation with maximally separated signals. In a bandwidth limited environment higher-order modulation schemes may be employed to improve the performance of the system however this choice results in consumption of larger signal power needed to maintain the same signal separation and thus the same error probability. In a power-limited .
