多径衰落信道下QOTDM系统的盲均衡算法

Abstract

Abstract:

An efficient blind equalization scheme for the Quasi-Orthogonal Time Division Multiplexed (QOTDM) system is presented. At the transmitter, the transmitted signal with a white frequency spectrum can be obtained by adding one group of QTODM sample sequences with a frequency shift to the other group, and the receiver can get two group sample sequences by filtering the received signal and the received signal with a frequency shift using a comb filter. Firstly, two groups of sample sequences are equalized blindly by the modified constant modulus algorithm (MCMA), then the output of the primary equalizer is equalized by MCMA before the deferent error is larger than the gate, and finally the equalizer adopts the algorithm of lease mean square combined with the decision feedback technique. After equalization, the inter symbol interference (ISI) can be cancelled. It is shown by Monte Carlo simulation that the new scheme can cancel the “ground effect” of the QOTDM system in the ground-air multi-path fading channel. When the Rice fading factor is 10dB, the signal-to-noise ratio of 4dB or so for SER of 10^-3 can be achieved by the scheme proposed compared with OFDM.

Key words: quasi-orthogonal time division multiplexed, orthogonal frequency division multiplexed, constant modulus algorithm, decision feedback

CLC Number:

TN929

WANG Jie-ling;LIU Zu-jun;YANG Hong;YI Ke-chu. Blind equalization algorithm for the QOTDM system in multi-path fading channels[J].J4, 2009, 36(5): 767-770+787.

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Blind equalization algorithm for the QOTDM system in multi-path fading channels

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