| 双向中继网络中基于正交预编码的盲干扰抵消 |
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| 引用本文： | 何宪文,窦高奇,高俊. 双向中继网络中基于正交预编码的盲干扰抵消[J]. 系统工程与电子技术, 2018, 40(8): 1855-1860. DOI: 10.3969/j.issn.1001-506X.2018.08.26 |
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| 作者姓名： | 何宪文 窦高奇 高俊 |
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| 作者单位： | 海军工程大学电子工程学院, 湖北 武汉 430033 |
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| 摘 要： | 双向中继网络(two way relay network, TWRN)在提高频谱效率的同时会引入额外的自干扰,针对放大转发模式下的自干扰抵消问题,从消除非理想信道估计带来的剩余自干扰着手,提出一种基于正交预编码的盲干扰抵消方案。新方案通过对端节点信号进行“右乘”正交预编码,将期望目标信号与自干扰信号映射到不依赖于信道状态信息的正交子空间,实现未知信道状态下自干扰抵消和期望信号分离,从而消除非理想信道估计带来的剩余自干扰对TWRN性能的影响,提高了系统的鲁棒性。在此基础上,通过推导平均误比特率(bit error rate, BER)的闭合表达式和渐进表达式,分析不同方案下信道估计误差对平均BER的影响,并通过仿真对比验证了理论推导的正确性。
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Blind interference cancelation for two way relay network using orthogonal precoding |
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| HE Xianwen,DOU Gaoqi,GAO Jun. Blind interference cancelation for two way relay network using orthogonal precoding[J]. System Engineering and Electronics, 2018, 40(8): 1855-1860. DOI: 10.3969/j.issn.1001-506X.2018.08.26 |
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| Authors: | HE Xianwen DOU Gaoqi GAO Jun |
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| Affiliation: | Institute of Electronic Engineering, Naval University of Engineering, Wuhan 430033, China |
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| Abstract: | In the two way relay network (TWRN), it brings the additional self interference when improving the spectrum effectiveness. The self interference cancellation for amplify and forward TWRN is considered. In order to cancel the residual self interference with the imperfect channel estimation, a blind interference cancelation scheme for TWRN using orthogonal precoding is proposed. In the new scheme, the transmit data blocks at the source node are precoded in postmultiplying,with the target signal and self interference signal projected onto the different orthogonal subspace that is independent of channel state information (CSI). With unknown CSI, the target signal and self interference are decoupled, and the residual self interference is canceled to improve the system robustness in TWRN with the imperfect channel estimation. Moreover, the close form expression and asymptotic expression of the average bit error rate (BER) are derived and the impact of imperfect channel estimation of different schemes is analysed. Numerical results validate the correctness of the derived expression. |
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