干扰对消系统的非零带宽性能与延时匹配

doi:10.3969/j.issn.1000-436x.2014.07.014

Abstract

Abstract:

The frequency-domain and time-domain characteristics of adaptive interference cancellation system were ana-lyzed,when interference signal had nonzero bandwidth.The nonzero bandwidth interference signal made the system a time-variation system.When the bandwidth was far less than the center frequency,the interference cancellation system could be approximated as an adaptive comb filter.The average convergence speed of the system was proportional to the overall reference signal gain,and the interference cancellation ratio (ICR) decreased with the increase of the bandwidth.The theoretical and simulation analyses of couple time delay matching reveal that the precise time delay matching can improve ICR significantly.

Key words: communication theory, interference cancellation system, nonzero bandwidth, time delay matching, weight, interference cancellation ratio

Yun-hao JIANG,Wei-feng CHEN,Shui-ming ZHONG,Hong-yun JIA,Yong-juan CAO,Peng MAO. Nonzero bandwidth performance and time delay matching of interference cancellation system[J]. Journal on Communications, 2014, 35(7): 113-121.

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References 16

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2BW		BW
2BW	f₁	f₂	f₃
200 Hz	4 MHz	4 MHz+100 Hz	4 MHz～100 Hz
20 kHz	4 MHz	4 MHz+10 kHz	4 MHz～10 kHz
2 MHz	4 MHz	5 MHz	3 MHz

Nonzero bandwidth performance and time delay matching of interference cancellation system

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