This paper provides the performance analysis of multiuser Vertical Bell Laboratories Layered Space-Time (V-BLAST) system receiver structures for Multiple-input Multiple-Output (MIMO) channel at a base station with ass...This paper provides the performance analysis of multiuser Vertical Bell Laboratories Layered Space-Time (V-BLAST) system receiver structures for Multiple-input Multiple-Output (MIMO) channel at a base station with assumption of perfect channel estimation and perfect timing delay estimation. In MIMO channels the receivers such as decorrelator, Minimum Mean Square Error (MMSE) and Multistage Parallel Interference Cancellation (MPIC) receiver outperform the conventional receiver. Withal, since the multiple antenna interference led to a strong impact on the performance degradation of a multistage interference cancellation receiver, the performance of MPIC receiver was highly degraded based on system loading.展开更多
MIMO-DFE(Multiple-Input-Multiple-Output Decision Feedback Equalizer) based receiver architectures are researched recently to detect signals in BLAST(Bell laboratories LAyered Space-Time) over frequency-selective chann...MIMO-DFE(Multiple-Input-Multiple-Output Decision Feedback Equalizer) based receiver architectures are researched recently to detect signals in BLAST(Bell laboratories LAyered Space-Time) over frequency-selective channels. Due to their recursive structure, these receivers may suffer from error propagation which results in an overall mean square error degradation. An MIMO-DFE based BLAST receiver with limited error propagation to combat frequencyselective channel is proposed, which employs both norm constraint on feedback filter taps and soft decision device. Simulation results show that the proposed receiver outperforms conventional ones in various frequency selective channels.展开更多
为了提高大规模MIMO系统的分集增益、降低译码复杂度,构建了一种码率为1的满分集贝尔实验室垂直分层空时码,并采用最大比合并算法(MRC)检测接收信号.分别计算了MRC算法的平均输出信干噪比(SINR)和传统迫零算法(ZF)的平均信噪比(SNR),分...为了提高大规模MIMO系统的分集增益、降低译码复杂度,构建了一种码率为1的满分集贝尔实验室垂直分层空时码,并采用最大比合并算法(MRC)检测接收信号.分别计算了MRC算法的平均输出信干噪比(SINR)和传统迫零算法(ZF)的平均信噪比(SNR),分析了性能相等时应满足的条件,并且比较了2种算法的计算复杂度和BER性能.结果表明,当BER=10-5,收发天线数为400和40、调制方式分别为BPSK和QPSK时,最大比合并算法的BER性能较迫零算法分别存在0.4和0.3 d B的增益.采用所提算法对接收信号进行检测,不但能够降低系统的计算复杂度,而且能保证系统的误比特率性能.展开更多
在多输入输出(Multiple-Input Multiple-Output,MIMO)系统中提出一种块分组编码与VBLAST的联合编码方案,该方案对最先检测的2层数据流采用块分组编码,其余层采用垂直分层空时码(Vertical Bell Layered Space-Time Code,VBLAST)的编码方...在多输入输出(Multiple-Input Multiple-Output,MIMO)系统中提出一种块分组编码与VBLAST的联合编码方案,该方案对最先检测的2层数据流采用块分组编码,其余层采用垂直分层空时码(Vertical Bell Layered Space-Time Code,VBLAST)的编码方式,MIMO系统同时具有了空时分组码(Space Time Block Code,STBC)可以降低误码率的优点与VBLAST能够提高系统容量的优点。块分组编码将数据符号按层分块后交叉通过不同的天线对发射,数据流之间产生了一定交织效果,使编码获得了更好的分集增益,在接收端结合QR分解的最大似然解码算法进行解码。仿真结果表明该联合编码方案与传统的Alamouti编码和VBLAST的联合编码方案相比误码率性能有较大改善。展开更多
针对BLAST(Bell labs layered space time)系统中其他小区的干扰会影响本小区BLAST接收机性能的缺点,提出一种基于博弈论的干扰避免算法.该算法为避免交互干扰,以最大化每个小区的平均信息量代替最大化所有小区的总信息量,并将BLAST系...针对BLAST(Bell labs layered space time)系统中其他小区的干扰会影响本小区BLAST接收机性能的缺点,提出一种基于博弈论的干扰避免算法.该算法为避免交互干扰,以最大化每个小区的平均信息量代替最大化所有小区的总信息量,并将BLAST系统中多个小区的干扰进行博弈论数学建模.仿真结果表明,该算法可减少小区间相互干扰,提高BLAST接收机的解码性能,增加BLAST接收机的互信息量.展开更多
针对实际中信道估计存在误差,从阵列信号处理的角度提出了V-BLAST(Vertical Bell Labs Layered Space-Time)OFDM系统中一种稳健的检测算法.将接收数据的协方差矩阵进行特征值分解,得到信号子空间,将存在估计误差的信道矢量向该子空间投...针对实际中信道估计存在误差,从阵列信号处理的角度提出了V-BLAST(Vertical Bell Labs Layered Space-Time)OFDM系统中一种稳健的检测算法.将接收数据的协方差矩阵进行特征值分解,得到信号子空间,将存在估计误差的信道矢量向该子空间投影,就可以得到较为准确的信道矢量,然后利用波束形成计算出检测滤波器的系数.仿真结果表明,当信道估计存在误差时,该方法性能显著优于ZF(Zero-Forcing)和MMSE(Minimum Mean Square Error)算法.展开更多
文摘This paper provides the performance analysis of multiuser Vertical Bell Laboratories Layered Space-Time (V-BLAST) system receiver structures for Multiple-input Multiple-Output (MIMO) channel at a base station with assumption of perfect channel estimation and perfect timing delay estimation. In MIMO channels the receivers such as decorrelator, Minimum Mean Square Error (MMSE) and Multistage Parallel Interference Cancellation (MPIC) receiver outperform the conventional receiver. Withal, since the multiple antenna interference led to a strong impact on the performance degradation of a multistage interference cancellation receiver, the performance of MPIC receiver was highly degraded based on system loading.
文摘MIMO-DFE(Multiple-Input-Multiple-Output Decision Feedback Equalizer) based receiver architectures are researched recently to detect signals in BLAST(Bell laboratories LAyered Space-Time) over frequency-selective channels. Due to their recursive structure, these receivers may suffer from error propagation which results in an overall mean square error degradation. An MIMO-DFE based BLAST receiver with limited error propagation to combat frequencyselective channel is proposed, which employs both norm constraint on feedback filter taps and soft decision device. Simulation results show that the proposed receiver outperforms conventional ones in various frequency selective channels.
文摘为了提高大规模MIMO系统的分集增益、降低译码复杂度,构建了一种码率为1的满分集贝尔实验室垂直分层空时码,并采用最大比合并算法(MRC)检测接收信号.分别计算了MRC算法的平均输出信干噪比(SINR)和传统迫零算法(ZF)的平均信噪比(SNR),分析了性能相等时应满足的条件,并且比较了2种算法的计算复杂度和BER性能.结果表明,当BER=10-5,收发天线数为400和40、调制方式分别为BPSK和QPSK时,最大比合并算法的BER性能较迫零算法分别存在0.4和0.3 d B的增益.采用所提算法对接收信号进行检测,不但能够降低系统的计算复杂度,而且能保证系统的误比特率性能.
文摘在多输入输出(Multiple-Input Multiple-Output,MIMO)系统中提出一种块分组编码与VBLAST的联合编码方案,该方案对最先检测的2层数据流采用块分组编码,其余层采用垂直分层空时码(Vertical Bell Layered Space-Time Code,VBLAST)的编码方式,MIMO系统同时具有了空时分组码(Space Time Block Code,STBC)可以降低误码率的优点与VBLAST能够提高系统容量的优点。块分组编码将数据符号按层分块后交叉通过不同的天线对发射,数据流之间产生了一定交织效果,使编码获得了更好的分集增益,在接收端结合QR分解的最大似然解码算法进行解码。仿真结果表明该联合编码方案与传统的Alamouti编码和VBLAST的联合编码方案相比误码率性能有较大改善。
文摘针对BLAST(Bell labs layered space time)系统中其他小区的干扰会影响本小区BLAST接收机性能的缺点,提出一种基于博弈论的干扰避免算法.该算法为避免交互干扰,以最大化每个小区的平均信息量代替最大化所有小区的总信息量,并将BLAST系统中多个小区的干扰进行博弈论数学建模.仿真结果表明,该算法可减少小区间相互干扰,提高BLAST接收机的解码性能,增加BLAST接收机的互信息量.
文摘针对实际中信道估计存在误差,从阵列信号处理的角度提出了V-BLAST(Vertical Bell Labs Layered Space-Time)OFDM系统中一种稳健的检测算法.将接收数据的协方差矩阵进行特征值分解,得到信号子空间,将存在估计误差的信道矢量向该子空间投影,就可以得到较为准确的信道矢量,然后利用波束形成计算出检测滤波器的系数.仿真结果表明,当信道估计存在误差时,该方法性能显著优于ZF(Zero-Forcing)和MMSE(Minimum Mean Square Error)算法.
