参考信号耦合有用信号对干扰对消系统的影响及其抑制

doi:10.11959/j.issn.1000-436x.2015205

Abstract

Abstract:

The time-domain characteristics of adaptive interference cancellation system with desired signal coupling to reference signal were analyzed.The analyses reveal the desired signal makes the system a time-variation system and the optimal weights were changed,which made the performance of cancellation system decreased and infulence the reception of the desired signal.According to the coupling characteristics of common platform communication system,the formulas of (ICR) interference cancellation ratio and (DCR) desired cancellation ratio were gained in time-domain.The law of ICR and DCR varying with relative delay phase was got.The method of delay time matching was brought forward.Through matching the delay time of the extraction point of the reference signal to the output of the orthogonal divider and the receiv-ing antenna to the injection point of the synthetic signal could suppress the decrease of ICR for the reference signal coupling desired signal.The simulation results reveal that the delay time matching can not only prevent the decrease of ICR for de-sired signal in reference signal but also improve the performance of cancellation system.

Key words: communication theory, interference cancellation system, desired signal, delay time matching, interference cancellation ratio, desire cancellation ratio

Yun-hao JIANG,Zhi-hua ZHAO. Influence and its suppression of desired signal coupling to reference signal to interference cancellation system[J]. Journal on Communications, 2015, 36(9): 98-108.

Figures/Tables 8

E_d/V	α,β		ICR/dB	DCR/dB
0	α=0,β=0		60	0
＞0	α=0.01 β=0.004	η=π	51.7	?0.08
		$η = \frac{π}{2}$	54.5	0
		$η = \frac{π}{25}$	64.4	0.08
		η=0	64.7	0.08
	α=0.01 β=0.003 2	$η = \frac{π}{25}$	77.8	0.08
	α=0.01 β=0.003 2	η=0	Inf	0.08

References 12

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