Training Optimization and Performance of Single Cell Uplink System With Massive-Antennas Base Station
Training Optimization and Performance of Single Cell Uplink System With Massive-Antennas Base Station
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DOI：
10.1109/tcomm.2018.2876416
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发表时间：
2019-02
影响因子：
8.3
通讯作者：
Songtao Lu;Zhengdao Wang
中科院分区：
文献类型：
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作者：
Songtao Lu;Zhengdao Wang
我们研究了单小区无线系统中上行链路传输的性能，其中所有的发射机都有单天线，基站有大量的天线。我们考虑最大比合并和迫零接收机和小规模和大规模衰落信道。我们还描述了可实现的总自由度（DoF）的这样一个系统，而无需假设在接收机的信道状态信息。系统的自由度结果是相同的单用户多输入多输出系统。然而，当用户的数量与接收天线的数量相同时，线性接收器不足以实现最大总DoF。量化了通过增加基站天线数量或增加相干间隔而可能节省的能源量。此外，在平均和峰值功率约束下的训练周期和训练能量分配被联合优化，以最大化可实现的和频谱效率（SE）。通过多个数值模拟验证了训练时间和能量优化对可实现SE的改善。
We study the performance of uplink transmission in single-cell wireless systems, where all the transmitters have single antennas and the base station has a large number of antennas. We consider both maximum ratio combining and zero-forcing receivers and both small- and large-scale fading channels. We also characterize the achievable total degrees of freedom (DoF) of such a system without assuming channel state information at the receiver. The system DoF turns out to be the same as that of a single-user multiple-input multiple-output system. However, when the number of users is the same as the number of receive antennas, linear receivers are not sufficient for achieving the maximum total DoF. The amount of energy savings that are possible through the increased number of base-station antennas or increased coherence interval are quantified. Furthermore, the training period and training energy allocation under the average and peak power constraints are optimized jointly to maximize the achievable sum spectral efficiency (SE). The improvement on achievable SE provided by the training duration and energy optimization is verified through multiple numerical simulations.