Design of transceiver for interference channel (IC) is an important research area. Max-SINR algorithm is an iterative algorithm for multi-input multi-output (MIMO) IC. Nodes in the MIMO IC, work in a time division dup...Design of transceiver for interference channel (IC) is an important research area. Max-SINR algorithm is an iterative algorithm for multi-input multi-output (MIMO) IC. Nodes in the MIMO IC, work in a time division duplex mode, where half of them are equipped with M antennas while the others have N antennas. It is shown how the Max-SINR algorithm proposed by Gomadam et al. converges by considering an equivalent problem, i.e. a constrained maximization problem.展开更多
干扰对齐(interference alignment,IA)是一种有效的干扰处理方法.通过预编码技术在接收端的特定维度上重叠干扰信号,进而完全消除干扰信号对所需信号的影响,而且能够提高信道的空间利用自由度.在干扰对齐中,通过在相同原理的相互不同网...干扰对齐(interference alignment,IA)是一种有效的干扰处理方法.通过预编码技术在接收端的特定维度上重叠干扰信号,进而完全消除干扰信号对所需信号的影响,而且能够提高信道的空间利用自由度.在干扰对齐中,通过在相同原理的相互不同网络上的预编码器和组合器的迭代计算来检测复杂符号.本文在传统的最小二乘法(least squares,LS)、最大信干噪比(maximum signal to interference plus noise ratio,MAX-SINR)算法的基础上,提出了基于符号检测辅助的最小二乘法(symbol detection aided least squares,SDA-LS)、符号检测辅助的最大信干噪比(symbol detection aided maximum signal to interference plus noise ratio,SDA-MAX-SINR)干扰对齐迭代算法.并且根据前者性能较差、复杂度低;后者复杂度高、性能优的特点,提出了一种基于符号检测辅助的最小二乘法和最大信干噪比相结合(symbol detection aided least squares combined with maximum signal to interference and noise ratio,SDA-LS+MAX-SINR)的干扰对齐迭代算法.通过计算机仿真,文中所提出的符号检测辅助算法比传统算法有更好的性能.展开更多
在802.11ac无线局域网络中,无线智能设备(WID)需通过无线接入点(AP)连接到网络,下行传输过程中其他AP会对目标WID造成干扰.提出采用基于迭代最小化均方误差干扰对齐算法(IMMSE-IA),抑制其他AP对目标WID的干扰.该方法通过对AP端和WID端...在802.11ac无线局域网络中,无线智能设备(WID)需通过无线接入点(AP)连接到网络,下行传输过程中其他AP会对目标WID造成干扰.提出采用基于迭代最小化均方误差干扰对齐算法(IMMSE-IA),抑制其他AP对目标WID的干扰.该方法通过对AP端和WID端分别进行线性预编码和后置编码处理,在最小化均方误差准则和功率限制约束下,得到最优预编码和后置编码.仿真结果表明:本方法在信噪比为5 d B情况下,单位带宽传输速率相对于传统最大化信干噪比算法求得的传输速率增加了1 bit/s.展开更多
In wideband multi-pair two-way relay networks, the performance of beamforming at a relay station(RS) is intimately related to the accuracy of the channel state information(CSI) available. The accuracy of CSI is determ...In wideband multi-pair two-way relay networks, the performance of beamforming at a relay station(RS) is intimately related to the accuracy of the channel state information(CSI) available. The accuracy of CSI is determined by Doppler spread, delay between beamforming and channel estimation, and density of pilot symbols,including transmit power of pilot symbols. The coefficient of the Gaussian-Markov CSI error model is modeled as a function of CSI delay, Doppler spread, and signal-to-noise ratio, and can be estimated in real time. In accordance with the real-time estimated coefficients of the error model, an adaptive robust maximum signal-to-interferenceand-noise ratio(Max-SINR) plus maximum signal-to-leakage-and-noise ratio(Max-SLNR) beamformer at an RS is proposed to track the variation of the CSI error. From simulation results and analysis, it is shown that: compared to existing non-adaptive beamformers, the proposed adaptive beamformer is more robust and performs much better in the sense of bit error rate(BER); with increase in the density of transmit pilot symbols, its BER and sum-rate performances tend to those of the beamformer of Max-SINR plus Max-SLNR with ideal CSI.展开更多
文摘Design of transceiver for interference channel (IC) is an important research area. Max-SINR algorithm is an iterative algorithm for multi-input multi-output (MIMO) IC. Nodes in the MIMO IC, work in a time division duplex mode, where half of them are equipped with M antennas while the others have N antennas. It is shown how the Max-SINR algorithm proposed by Gomadam et al. converges by considering an equivalent problem, i.e. a constrained maximization problem.
文摘干扰对齐(interference alignment,IA)是一种有效的干扰处理方法.通过预编码技术在接收端的特定维度上重叠干扰信号,进而完全消除干扰信号对所需信号的影响,而且能够提高信道的空间利用自由度.在干扰对齐中,通过在相同原理的相互不同网络上的预编码器和组合器的迭代计算来检测复杂符号.本文在传统的最小二乘法(least squares,LS)、最大信干噪比(maximum signal to interference plus noise ratio,MAX-SINR)算法的基础上,提出了基于符号检测辅助的最小二乘法(symbol detection aided least squares,SDA-LS)、符号检测辅助的最大信干噪比(symbol detection aided maximum signal to interference plus noise ratio,SDA-MAX-SINR)干扰对齐迭代算法.并且根据前者性能较差、复杂度低;后者复杂度高、性能优的特点,提出了一种基于符号检测辅助的最小二乘法和最大信干噪比相结合(symbol detection aided least squares combined with maximum signal to interference and noise ratio,SDA-LS+MAX-SINR)的干扰对齐迭代算法.通过计算机仿真,文中所提出的符号检测辅助算法比传统算法有更好的性能.
文摘在802.11ac无线局域网络中,无线智能设备(WID)需通过无线接入点(AP)连接到网络,下行传输过程中其他AP会对目标WID造成干扰.提出采用基于迭代最小化均方误差干扰对齐算法(IMMSE-IA),抑制其他AP对目标WID的干扰.该方法通过对AP端和WID端分别进行线性预编码和后置编码处理,在最小化均方误差准则和功率限制约束下,得到最优预编码和后置编码.仿真结果表明:本方法在信噪比为5 d B情况下,单位带宽传输速率相对于传统最大化信干噪比算法求得的传输速率增加了1 bit/s.
基金Project supported by the Open Research Fund of National Mobile Communications Research Laboratory,Southeast University,China(No.2013D02)the Open Research Fund of National Key Laboratory of Electromagnetic Environment,China Research Institute of Radiowave Propagation(No.201500013)+2 种基金the National Natural Science Foundation of China(Nos.61271230,61472190,and 61501238)the Research Fund for the Doctoral Program of Higher Education of China(No.20113219120019)the Jiangsu Provincial Science Foundation Project,China(No.BK20150786)
文摘In wideband multi-pair two-way relay networks, the performance of beamforming at a relay station(RS) is intimately related to the accuracy of the channel state information(CSI) available. The accuracy of CSI is determined by Doppler spread, delay between beamforming and channel estimation, and density of pilot symbols,including transmit power of pilot symbols. The coefficient of the Gaussian-Markov CSI error model is modeled as a function of CSI delay, Doppler spread, and signal-to-noise ratio, and can be estimated in real time. In accordance with the real-time estimated coefficients of the error model, an adaptive robust maximum signal-to-interferenceand-noise ratio(Max-SINR) plus maximum signal-to-leakage-and-noise ratio(Max-SLNR) beamformer at an RS is proposed to track the variation of the CSI error. From simulation results and analysis, it is shown that: compared to existing non-adaptive beamformers, the proposed adaptive beamformer is more robust and performs much better in the sense of bit error rate(BER); with increase in the density of transmit pilot symbols, its BER and sum-rate performances tend to those of the beamformer of Max-SINR plus Max-SLNR with ideal CSI.
