基于虚拟时间反转镜的水声OFDM信道均衡

doi:10.11959/j.issn.1000-436x.2015011

Abstract

Abstract:

To solve the problem of the severe inter-symbol interference of orthogonal frequency division multiplexing (OFDM) communication caused by underwater acoustic multipath channel,a virtual time reversal channel equalization scheme was proposed.VTRM was able to shorten the channel impulse response and alleviate the phase distortion caused by the acoustic channel for its characteristic of the temporal compression and phase conjugation in frequency domain.The matching pursuit (MP) algorithm was applied to estimate the channel impulse response which could estimate the channel amplitude,time delay and phase accurately.It provided the channel information for the VTRM channel equalization.It also improved a lot compared to the traditional matching correlation channel estimation method which couldn't estimate the channel phase and the estimation precision was low.The simulation,pool trail and Songhua lake experiment show that the performance of VTRM channel equalization is better than that of the PTRM and LS channel equalization in the OFDM underwater acoustic communication.

Key words: virtual time reversal mirror, channel equalization, matching pursuit, orthogonal frequency division multi-plexing

Yan-ling YIN,Gang QIAO,Song-zuo LIU. Underwater acoustic OFDM channel equalization based on virtual time reversal mirror[J]. Journal on Communications, 2015, 36(1): 90-99.

Figures/Tables 11

References 31

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估计信噪比/dB	估计速度/(m·s^?1)	LS解码前误码率/%	LS解码后误码率/%	PTRM解码前误码率/%	PTRM解码后误码率/%	VTRM解码前误码率/%	VTRM解码后误码率/%
21.7	0.45	10.04	6.77	8.50	5.35	6.92	2.67
20.6	0.41	8.58	4.39	7.26	0.4	6.92	0.59
21.1	0.37	10.67	13.98	7.95	4.46	8.57	3.86
21.4	0.39	10.11	9.23	8.58	2.60	7.44	1.19
23.1	0.48	7.66	2.16	7.07	1.78	5.27	0
22.5	0.35	8.50	5.88	8.02	4.31	7.77	3.57
22.7	0.37	8.42	6.28	7.07	3.83	7.71	2.22
22.1	0.29	8.65	4.53	8.72	3.79	7.47	2.08

Underwater acoustic OFDM channel equalization based on virtual time reversal mirror

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