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首页> 外文期刊>Wireless Communications, IEEE Transactions on >Near-Optimal Downlink Precoding for Two-Tier Priority-Based Wireless Networks
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Near-Optimal Downlink Precoding for Two-Tier Priority-Based Wireless Networks

机译：基于两层优先级的无线网络的近乎最佳下行链路预编码

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摘要

In this paper, we study a two-tier priority-based wireless cellular network in which the primary base station (BS) has multiple antennas and the other terminals have a single antenna. We assume that we have two classes of users: high priority users and low priority users. We consider a rate maximization problem of the low priority users under signal-to-interference-plus-noise-ratio constraints on the high priority user to guarantee a certain quality-of-service for the high priority user. Since the interference due to the low priority users which communicate with each other via direct transmission may severely degrade the performance of the high priority user, we propose a BS-aided two-way relaying approach in which the BS helps relay the low priority users' signals instead of allowing them to communicate with each other via a direct path between them. In addition, an algorithm to find a near-optimal beamforming solution at the BS is proposed. The asymptotic results in the high power regime are derived to verify the average sum rate performance in the proposed scheme. Finally, based on some selected numerical results, we show that the proposed scheme outperforms the direct transmission scheme over a wide transmit power range.
机译：在本文中，我们研究了一个基于两层优先级的无线蜂窝网络，其中主基站（BS）具有多个天线，而其他终端具有单个天线。我们假设我们有两类用户：高优先级用户和低优先级用户。考虑高优先级用户在信号干扰加噪声比约束下低优先级用户的速率最大化问题，以保证高优先级用户一定的服务质量。由于低优先级用户通过直接传输相互通信造成的干扰可能会严重降低高优先级用户的性能，因此我们提出了一种BS辅助的双向中继方法，其中BS可以帮助中继低优先级用户的中继。信号，而不是让它们通过它们之间的直接路径相互通信。另外，提出了一种在基站处寻找最佳波束成形解决方案的算法。推导了高功率状态下的渐近结果，以验证所提出方案的平均求和速率性能。最后，基于一些选定的数值结果，我们表明，该方案在较宽的发射功率范围内优于直接传输方案。

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