基于MBER的联合预编码与空时编码GFDM功率分配策略

doi:10.11959/j.issn.1000-0801.2021261

摘要/Abstract

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)。

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

Abstract:

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.

Key words: generalized frequency division multiplexing, bit error rate, bandwidth efficiency, space time coding, power allocation

中图分类号:

TN911

蔡建辉, 李光球, 段彦旭. 基于MBER的联合预编码与空时编码GFDM功率分配策略[J]. 电信科学, 2021, 37(12): 25-31.

Jianhui CAI, Guangqiu LI, Yanxu DUAN. MBER power allocation for joint precoding and space-time coding GFDM[J]. Telecommunications Science, 2021, 37(12): 25-31.

图/表 5

参考文献 18

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	Tap1	Tap2	Tap3	Tap4	Tap5	Tap6
时延/ns	0	100	200	300	500	700
功率/dB	0	-3.6	-7.2	-10.8	-18.0	-25.2