论文标题
高动细胞无细胞大规模MIMO-OFDM系统的上行链路性能
Uplink Performance of High-Mobility Cell-Free Massive MIMO-OFDM Systems
论文作者
论文摘要
近年来，与正交频分复（OFDM）技术的高速列车（HST）通信受到了极大的关注。此外，无细胞（CF）庞大的多输入多输出（MIMO）被认为是达到最终性能限制的有前途的技术。在本文中，我们专注于HST Communications中匹配过滤器和大规模褪色解码器（LSFD）接收器的CF大量MIMO-OFDM系统的性能。还分析了与小细胞和细胞大量MIMO-OFDM系统的HST通信以进行比较。考虑到多普勒频率偏移（DFO）对系统性能的不良影响，因此得出了所有系统的上行光谱效率（SE）的精确闭合形式表达式。根据仿真结果，我们发现具有LSFD的CF大量MIMO-OFDM系统比其他系统达到了更大的SE和SE下降百分比。此外，增加访问点（AP）和每个AP的天线的数量可以有效地补偿DFO的性能损失。此外，AP和HST之间存在最佳的垂直距离，以达到最大SE。
High-speed train (HST) communications with orthogonal frequency division multiplexing (OFDM) techniques have received significant attention in recent years. Besides, cell-free (CF) massive multiple-input multiple-output (MIMO) is considered a promising technology to achieve the ultimate performance limit. In this paper, we focus on the performance of CF massive MIMO-OFDM systems with both matched filter and large-scale fading decoding (LSFD) receivers in HST communications. HST communications with small cell and cellular massive MIMO-OFDM systems are also analyzed for comparison. Considering the bad effect of Doppler frequency offset (DFO) on system performance, exact closed-form expressions for uplink spectral efficiency (SE) of all systems are derived. According to the simulation results, we find that the CF massive MIMO-OFDM system with LSFD achieves both larger SE and lower SE drop percentages than other systems. In addition, increasing the number of access points (APs) and antennas per AP can effectively compensate for the performance loss from the DFO. Moreover, there is an optimal vertical distance between APs and HST to achieve the maximum SE.
