基于MBER的联合预编码与空时编码GFDM功率分配策略  

MBER power allocation for joint precoding and space-time coding GFDM

作　　者：蔡建辉[1] 李光球[1] 段彦旭 CAI Jianhui;LI Guangqiu;DUAN Yanxu(Hangzhou Dianzi University,Hangzhou 310018,China)

机构地区：[1]杭州电子科技大学,浙江杭州310018

出　　处：《电信科学》2021年第12期25-31,共7页Telecommunications Science

摘　　要：为改善频率选择性衰落信道上广义频分复用(GFDM)系统的误比特率和频带利用率性能,基于最小误比特率(MBER)准则,提出一种联合预编码和空时编码(STC)的GFDM系统及其相应的功率分配策略,可将该功率分配策略的优化目标由MBER转化为最小化其噪声增强因子,并推导了联合预编码与空时编码GFDM系统的功率分配、误比特率和频带利用率性能解析表达式。数值计算和仿真结果表明,与预编码STC-GFDM系统相比,基于MBER准则的预编码STC-GFDM系统的误码性能在误比特率为10^(−3)时改善约0.4 dB,频带利用率性能在信噪比为12 dB时提高约0.24 bit/(s·Hz)。In order to improve the bit error rate(BER)and bandwidth utilization performance of generalized frequency division multiplexing(GFDM)system over frequency selective fading channels,based on the minimum bit error rate(MBER)criterion,a joint precoding and space-time coding(STC)GFDM system and its corresponding power allocation strategy were proposed.The optimization goal of the power allocation strategy for the precoding STC-GFDM system can be converted from MBER to minimizing its noise enhancement factor,and the analytical expressions of its power allocation,bit error rate(BER)and bandwidth utilization were derived.Numerical calculation and simulation results show that compared with the precoding STC-GFDM system,the BER performance of precoding STC-GFDM system based on MBER criterion can be improved by about 0.4 dB when BER is 10^(−3),and the bandwidth utilization performance can be improved by about 0.24 bit/(s·Hz)when signal to noise ratiois 12 dB.

关 键 词：广义频分复用 误比特率 频带利用率 空时编码 功率分配 

分 类 号：TN911[电子电信—通信与信息系统]