How to obtain accurate channel state information(CSI)at the transmitter with less pilot overhead for frequency division duplexing(FDD) massive multiple-input multiple-output(MIMO)system is a challenging issue due to t...How to obtain accurate channel state information(CSI)at the transmitter with less pilot overhead for frequency division duplexing(FDD) massive multiple-input multiple-output(MIMO)system is a challenging issue due to the large number of antennas. To reduce the overwhelming pilot overhead, a hybrid orthogonal and non-orthogonal pilot distribution at the base station(BS),which is a generalization of the existing pilot distribution scheme,is proposed by exploiting the common sparsity of channel due to the compact antenna arrangement. Then the block sparsity for antennas with hybrid pilot distribution is derived respectively and can be used to obtain channel impulse response. By employing the theoretical analysis of block sparse recovery, the total coherence criterion is proposed to optimize the sensing matrix composed by orthogonal pilots. Due to the huge complexity of optimal pilot acquisition, a genetic algorithm based pilot allocation(GAPA) algorithm is proposed to acquire optimal pilot distribution locations with fast convergence. Furthermore, the Cramer Rao lower bound is derived for non-orthogonal pilot-based channel estimation and can be asymptotically approached by the prior support set, especially when the optimized pilot is employed.展开更多
移动通信在二十世纪九十年代便显示出强劲的发展势头,近几年,随着微电子和通信技术的快速发展,各种新技术和新设备层出不穷。3G结合了因特网技术,引领移动通信进入移动互联网时代;4G融合了无线局域网(Wireless Local Area Network,WLAN...移动通信在二十世纪九十年代便显示出强劲的发展势头,近几年,随着微电子和通信技术的快速发展,各种新技术和新设备层出不穷。3G结合了因特网技术,引领移动通信进入移动互联网时代;4G融合了无线局域网(Wireless Local Area Network,WLAN)技术,扩大了用户规模,使数据网络传输速率更高;5G将深度融合社会各行行业,渗透到社会的各个领域,将实现人、机、物万物互联。基于此,概述移动通信系统中的双工技术,对5G新型双工技术进行了展望。展开更多
基金supported by the National Natural Science Foundation of China(61671176 61671173)the Fundamental Research Funds for the Center Universities(HIT.MKSTISP.2016 13)
文摘How to obtain accurate channel state information(CSI)at the transmitter with less pilot overhead for frequency division duplexing(FDD) massive multiple-input multiple-output(MIMO)system is a challenging issue due to the large number of antennas. To reduce the overwhelming pilot overhead, a hybrid orthogonal and non-orthogonal pilot distribution at the base station(BS),which is a generalization of the existing pilot distribution scheme,is proposed by exploiting the common sparsity of channel due to the compact antenna arrangement. Then the block sparsity for antennas with hybrid pilot distribution is derived respectively and can be used to obtain channel impulse response. By employing the theoretical analysis of block sparse recovery, the total coherence criterion is proposed to optimize the sensing matrix composed by orthogonal pilots. Due to the huge complexity of optimal pilot acquisition, a genetic algorithm based pilot allocation(GAPA) algorithm is proposed to acquire optimal pilot distribution locations with fast convergence. Furthermore, the Cramer Rao lower bound is derived for non-orthogonal pilot-based channel estimation and can be asymptotically approached by the prior support set, especially when the optimized pilot is employed.
文摘移动通信在二十世纪九十年代便显示出强劲的发展势头,近几年,随着微电子和通信技术的快速发展,各种新技术和新设备层出不穷。3G结合了因特网技术,引领移动通信进入移动互联网时代;4G融合了无线局域网(Wireless Local Area Network,WLAN)技术,扩大了用户规模,使数据网络传输速率更高;5G将深度融合社会各行行业,渗透到社会的各个领域,将实现人、机、物万物互联。基于此,概述移动通信系统中的双工技术,对5G新型双工技术进行了展望。
