Channel equalization for filter bank based transmultiplexer system for wireless communications

Authors:
Jian Dang;Zaichen Zhang
Affiliations:
National Mobile Communications Research Laboratory, Southeast University, Nanjing, China;National Mobile Communications Research Laboratory, Southeast University, Nanjing, China
Venue:
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Year:
2009

Citing 6
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Abstract

This paper studies the subband equalization issues of filter bank based transmultiplexer system for wireless communications. The zero ISI/ICI and minimum MSE conditions for subband equalization are formulated from a fullband equalizer in a simple way by utilizing multirate filter bank theory. Then a pointwise equalization method that uses a complex FIR filter is employed to approximate the conditions for each subband. In the formulation process a response jump phenomenon is found in previous work which limits the equalization performance. A two-step decimation equalizer structure is then proposed to eliminate the phenomenon and a polyphase representation is applied to keep the computational complexity unchanged. Simulation results performed in a quasi-static Rayleigh fading channel show that the proposed subband equalizer with two-step decimation structure outperforms the existing one-step decimation equalizers.