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考虑无线信道的时间相关性,提出了2种多天线广播系统中降低复杂度的用户选择方案.根据信道相干时间和多普勒频率的关系,将发送信息序列划分为数据段.在每个数据段的开始时刻,利用贪婪用户选择算法做选择.在基于时间相关的用户选择算法SUSTC中,其余时隙仍然保持该段开始时刻的选择结果.而在改进的基于时间相关的用户选择算法ISUSTC中,在其余时刻,保留信道条件较好的一些用户仍被选中,然后在备选用户集合中更新其他用户.仿真结果表明,与贪婪用户选择方法相比,所提出的算法降低了用户选择复杂度而只需损失少许系统和容量.
Considering the time correlation of wireless channels, a scheme to reduce the complexity of two kinds of multi-antenna broadcast systems is proposed. According to the relationship between channel coherence time and Doppler frequency, the information sequence is divided into data segments. Segment start time, the use of greedy user selection algorithm to make a choice.In the time-dependent user selection algorithm SUSTC, the remaining time slots still maintain the selection of the beginning of the segment results in the improved time-based user selection algorithm ISUSTC , And for the rest of the time, some users who retain better channel conditions are still selected and then update other users in the candidate user set.The simulation results show that compared with the greedy user selection method, the proposed algorithm reduces the user selection complexity Just lose a little system and capacity.