The coding gains including self-gain, mutual-gain and their variations for coding memory are denned, and the formulas for computing the gains are derived. The coding gains, used as the criteria, will be enable us to s...The coding gains including self-gain, mutual-gain and their variations for coding memory are denned, and the formulas for computing the gains are derived. The coding gains, used as the criteria, will be enable us to select an efficient code for memory system design quantitatively. Finally, the numerical results of some examples are analysed and discussed.展开更多
A method of space-time block coding （STBC） system based on adaptive beamforming of cyclostationarity signal algorithm is proposed.The method uses cyclostationarity of signals to achieve adaptive beamforming,then con...A method of space-time block coding （STBC） system based on adaptive beamforming of cyclostationarity signal algorithm is proposed.The method uses cyclostationarity of signals to achieve adaptive beamforming,then constructs a pair of low correlated transmit beams based on beamform estimation of multiple component signals of uplink.Using these two selected transmit beams,signals encoded by STBC are transmitted to achieve diversity gain and beamforming gain at the same time,and increase the signal to noise ratio （SNR） of downlink.With simple computation and fast convergence performance,the proposed scheme is applicable for time division multiple access （TDMA） wireless communication operated in a complex interference environment.Simulation results show that the proposed scheme has better performance than conventional STBC,and can obtain a gain of about 5 dB when the bit error ratio （BER） is 10-4.展开更多
提出一种基于卢卡斯数列构造围长至少为8的规则(j,k)卢卡斯QC-LDPC(L-QC-LDPC)码的方法。该方法构造的码字围长较大,能够有效地消除短环。循环置换子矩阵维数p值的下界允许连续取值,且在硬件实现方面可节省存储空间,进而降低硬件实现成...提出一种基于卢卡斯数列构造围长至少为8的规则(j,k)卢卡斯QC-LDPC(L-QC-LDPC)码的方法。该方法构造的码字围长较大,能够有效地消除短环。循环置换子矩阵维数p值的下界允许连续取值,且在硬件实现方面可节省存储空间,进而降低硬件实现成本以及复杂度。仿真结果表明,在码率为1/2、码长为1 302和误码率为10?6时,L-QC-LDPC码与OCS-LDPC码相比,净编码增益(NCG)提高了约2 d B,比确定性码的NCG提高了约0.8 d B;与二次函数相比,性能略优于二次函数LDPC(QF-LDPC)码,有约0.1 d B NCG的改善。同时,在相同码率、相近码长和误码率为10^(-6)时,L-QC-LDPC码与基于有限域的循环子集构造的QC-LDPC码相比,提高了约0.5 d B的净编码增益。展开更多
文摘The coding gains including self-gain, mutual-gain and their variations for coding memory are denned, and the formulas for computing the gains are derived. The coding gains, used as the criteria, will be enable us to select an efficient code for memory system design quantitatively. Finally, the numerical results of some examples are analysed and discussed.
文摘A method of space-time block coding （STBC） system based on adaptive beamforming of cyclostationarity signal algorithm is proposed.The method uses cyclostationarity of signals to achieve adaptive beamforming,then constructs a pair of low correlated transmit beams based on beamform estimation of multiple component signals of uplink.Using these two selected transmit beams,signals encoded by STBC are transmitted to achieve diversity gain and beamforming gain at the same time,and increase the signal to noise ratio （SNR） of downlink.With simple computation and fast convergence performance,the proposed scheme is applicable for time division multiple access （TDMA） wireless communication operated in a complex interference environment.Simulation results show that the proposed scheme has better performance than conventional STBC,and can obtain a gain of about 5 dB when the bit error ratio （BER） is 10-4.
文摘提出一种基于卢卡斯数列构造围长至少为8的规则(j,k)卢卡斯QC-LDPC(L-QC-LDPC)码的方法。该方法构造的码字围长较大,能够有效地消除短环。循环置换子矩阵维数p值的下界允许连续取值,且在硬件实现方面可节省存储空间,进而降低硬件实现成本以及复杂度。仿真结果表明,在码率为1/2、码长为1 302和误码率为10?6时,L-QC-LDPC码与OCS-LDPC码相比,净编码增益(NCG)提高了约2 d B,比确定性码的NCG提高了约0.8 d B;与二次函数相比,性能略优于二次函数LDPC(QF-LDPC)码,有约0.1 d B NCG的改善。同时,在相同码率、相近码长和误码率为10^(-6)时,L-QC-LDPC码与基于有限域的循环子集构造的QC-LDPC码相比,提高了约0.5 d B的净编码增益。
