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arXiv 1012.0452cs.ITmath.IT
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实现SINR目标的平均最小发射功率:各种用户选择算法的性能比较

Average Minimum Transmit Power to achieve SINR Targets: Performance Comparison of Various User Selection Algorithms

Umer Salim, Dirk Slock

摘要:

在从一个基站(BS)到多个用户的多用户通信中,最小化发射功率以在用户处实现某些目标保证性能(速率)的问题已经在文献中得到了很好的研究。类似地,当BS必须向系统中的用户的子集发送时,已经提出并分析了各种用户选择算法,主要是为了和速率最大化的目标。我们研究的联合问题,最大限度地减少在BS的发射功率,以实现特定的信号干扰噪声比(SINR)的目标,在用户与用户调度。由于需要对波束成形向量和功率分配标量进行联合优化,即使在没有用户选择的情况下,也难以获得在用户侧满足保证性能所需的平均发射功率的一般分析结果。我们研究了各种用户选择算法,即半正交用户选择(SUS),基于范数的用户选择(NUS)和基于角度的用户选择(AUS)的发射功率最小化问题。当要实现的SINR目标相对较大时,对于任意数量的用户,推导出NUS和SUS的平均最小发射功率表达式。对于只有两个用户被选择的特殊情况下,类似的表达式进一步推导出AUS和性能上限,用于基准性能的其他选择方案。在各种设置下进行的仿真结果表明,SUS是迄今为止更好的用户选择标准。

英文摘要:

In multi-user communication from one base station (BS) to multiple users, the problem of minimizing the transmit power to achieve some target guaranteed performance (rates) at users has been well investigated in the literature. Similarly various user selection algorithms have been proposed and analyzed when the BS has to transmit to a subset of the users in the system, mostly for the objective of the sum rate maximization. We study the joint problem of minimizing the transmit power at the BS to achieve specific signal-to-interference-and-noise ratio (SINR) targets at users in conjunction with user scheduling. The general analytical results for the average transmit power required to meet guaranteed performance at the users' side are difficult to obtain even without user selection due to joint optimization required over beamforming vectors and power allocation scalars. We study the transmit power minimization problem with various user selection algorithms, namely semi-orthogonal user selection (SUS), norm-based user selection (NUS) and angle-based user selection (AUS). When the SINR targets to achieve are relatively large, the average minimum transmit power expressions are derived for NUS and SUS for any number of users. For the special case when only two users are selected, similar expressions are further derived for AUS and a performance upper bound which serves to benchmark the performance of other selection schemes. Simulation results performed under various settings indicate that SUS is by far the better user selection criterion.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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