Trellis-coded CPFSK and soft-decision feedback equalization for micro-cellular wireless applications |
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| Authors: | W Zhuang W A Krzymien P A Goud |
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| Affiliation: | (1) Department of Electrical and Computer Engineering, University of Waterloo, N2L 3G1 Waterloo, Ontario, Canada;(2) Telecommunications Research Laboratories, 800 Park Plaza, 10611-98 Avenue, T5K 2P7 Edmonton, Alberta, Canada;(3) Department of Electrical Engineering, University of Alberta, T6G 2G7 Edmonton, Alberta, Canada |
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| Abstract: | In this paper, trellis-codedM-ary CPFSK with noncoherent envelope detection and adaptive channel equalization are investigated to improve the bit error rate (BER) performance of microcellular digital wireless communications systems. For the same spectral efficiency, the trellis-coded modulation (TCM) schemes studied outperform minimum shift keying (MSK) with noncoherent or differentially coherent detection in Rayleigh fading channels. For the case of frequency-selective fading channels, adaptive channel equalization is applied to mitigate the time-variant intersymbol interference (ISI). A new equalizer structure is proposed which, in its feedback path, makes use of fractionally spaced signal samples instead of symbol-spaced hard decisions on transmitted symbols. Computer simulation results indicate that the soft-decision feedback equalizer (SDFE) can significantly improve the system's performance. |
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