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稀疏多径信道中单载波频域均衡系统的联合干扰抵消和均衡
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作者 魏胜群 吴启晖 王金龙 《信号处理》 CSCD 北大核心 2007年第2期250-255,共6页
针对大时延稀疏多径信道条件下的单载波频域均衡系统(SC-FDE),本文提出了一种新的迭代均衡结构,记为IC-FDE-DFE。IC-FDE-DFE可以缩短频域均衡所需的循环前缀(CP)的长度,提高稀疏多径信道下SC-FDE系统的带宽效率和功率效率。与单纯的时... 针对大时延稀疏多径信道条件下的单载波频域均衡系统(SC-FDE),本文提出了一种新的迭代均衡结构,记为IC-FDE-DFE。IC-FDE-DFE可以缩短频域均衡所需的循环前缀(CP)的长度,提高稀疏多径信道下SC-FDE系统的带宽效率和功率效率。与单纯的时频域混合判决反馈均衡器(H-DFE)相比,IC-FDE-DFE能够充分利用信道的‘稀疏’特性,其中的均衡器具有较低的运算复杂度和设计复杂度。仿真结果表明,IC-FDE-DFE能够在迭代过程中逐渐抵消大时延多径的影响,逼近H-DFE的理想性能。 展开更多
关键词 分组间干扰(IBI) 符号间干扰(ISI) 干扰抵消(ic) 频域均衡(FDE) 判决反馈均衡(DFE)
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Adaptive Step Size Control of LMS-based Interference Cancellation for ICS Repeater in Wibro Environment 被引量:1
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作者 Jeong-gon KIM Won-geon BAE Won-seok CHOI 《Journal of Measurement Science and Instrumentation》 CAS 2010年第1期98-102,共5页
The use of repeater for the support of high rate data trans- mission and the extension of cell coverage is imperative for the Wibro system, which based on the IEEE 802.16e standardization. Generally, if the separation... The use of repeater for the support of high rate data trans- mission and the extension of cell coverage is imperative for the Wibro system, which based on the IEEE 802.16e standardization. Generally, if the separation between transmitting and receiving antennas is not sufficient, the oscillation of repeater and the interference due to the feedback signals from original transmitted signal may be oectLrr. Hence, the Interference Cancellation System (ICS) should be implemented as the important part of the repeater system for the mobile cellular systems in order to eliminate unwanted signals from the corrupted signals in the receiver. In this paper, we propose an adaptive technique for the Least Mean Square(LMS)-based interference cancellation methods by changing the step size according to the variation of channel envirorauent in onter to improve the performance degradation which occta-rs by using the fixed step size approach. Simulation results show that the proposed scheme attains a little lower Ber Error Rate(BER) performance and much faster convergence speed compared to the conventional LMS-based interference cancellation techniques. The proposed scheme can be applied to other Orthogonal Frequency Division Multiple(OFDM)-based cellular systenas and also be expected to achieve a similar performance improvement to IMT-advanced system, which is called as the next generation mobile communication standards. 展开更多
关键词 WIBRO mobile communication repeater adaptive inter-ference cancellation
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