MIMO单载波分数阶傅里叶域均衡系统及最优阶次选择方法
发布时间：2019-04-13 17:43
【摘要】：单载波频域均衡(SC-FDE)技术可以有效地克服无线传输中的多径衰落,而多输入多输出(MIMO)能大大提高频谱利用率.两者的结合已成为下一代无线通信系统上行链路的传输方案.然而,当无线信道是快速时变时,MIMO SC-FDE系统的频域信道矩阵将为非对角矩阵,形成严重的频域子信道间干扰,使系统性能急剧下降.针对这一问题,本文采用在分数阶傅里叶域均衡代替传统频域均衡,提出MIMO单载波分数阶傅里叶域均衡(MIMO SC-FrFDE)系统.通过选择合适的分数阶傅里叶变换阶次,实现分数阶傅里叶域信道矩阵的近似对角化.仿真结果表明,在快速时变信道下,本文提出的MIMO SC-Fr FDE系统比传统MIMO SC-FDE具有更好的误码率性能.
[Abstract]:Single carrier frequency domain equalization (SC-FDE) technique can effectively overcome multipath fading in wireless transmission, while multi-input multiple-output (MIMO) can greatly improve spectrum efficiency. The combination of the two has become the uplink transmission scheme of the next generation wireless communication system. However, when the wireless channel is fast time-varying, the frequency-domain channel matrix of the MIMO SC-FDE system will be non-diagonal matrix, resulting in a serious inter-channel interference between the frequency-domain subchannels, resulting in a sharp degradation of the system performance. In order to solve this problem, the fractional Fourier domain equalization (MIMO SC-FrFDE) system of MIMO single carrier is proposed in this paper, which replaces the traditional frequency domain equalization in fractional Fourier domain equalization. The approximate diagonalization of the fractional Fourier domain channel matrix is realized by selecting the appropriate fractional Fourier transform order. The simulation results show that the proposed MIMO SC-Fr FDE system has better bit error rate (BER) performance than the traditional MIMO SC-FDE system in fast time-varying channels.
【作者单位】： 郑州大学信息工程学院;
【基金】：国家自然科学基金(No.61201251,No.61172086,No.61210005,No.61331021)
【分类号】：TN919.3
[Abstract]:Single carrier frequency domain equalization (SC-FDE) technique can effectively overcome multipath fading in wireless transmission, while multi-input multiple-output (MIMO) can greatly improve spectrum efficiency. The combination of the two has become the uplink transmission scheme of the next generation wireless communication system. However, when the wireless channel is fast time-varying, the frequency-domain channel matrix of the MIMO SC-FDE system will be non-diagonal matrix, resulting in a serious inter-channel interference between the frequency-domain subchannels, resulting in a sharp degradation of the system performance. In order to solve this problem, the fractional Fourier domain equalization (MIMO SC-FrFDE) system of MIMO single carrier is proposed in this paper, which replaces the traditional frequency domain equalization in fractional Fourier domain equalization. The approximate diagonalization of the fractional Fourier domain channel matrix is realized by selecting the appropriate fractional Fourier transform order. The simulation results show that the proposed MIMO SC-Fr FDE system has better bit error rate (BER) performance than the traditional MIMO SC-FDE system in fast time-varying channels.
【作者单位】： 郑州大学信息工程学院;
【基金】：国家自然科学基金(No.61201251,No.61172086,No.61210005,No.61331021)
【分类号】：TN919.3
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