Achievable Rate Region for Downlink Beamforming in the Presence of Interference
Achievable Rate Region for Downlink Beamforming in the Presence of Interference
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DOI：
10.1109/acssc.2007.4487519
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发表时间：
2007-11
期刊：
影响因子：
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通讯作者：
Xiaohu Shang;Biao Chen
中科院分区：
文献类型：
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作者：
Xiaohu Shang;Biao Chen
本文研究了在下行链路传输中存在相互干扰时的最优信令问题。限制每个接收器到一个单一的用户检测器，我们表明，计算可达到的速率区域相当于解决一个家庭的非凸优化问题。认识到在预期的接收器和干扰功率在非预期的接收器的信号功率之间的内在联系，我们将原来的家庭的非凸优化问题转化为一个新的家庭的凸优化。这个新的家庭的优化问题的封闭形式的解决方案。有趣的是，对于多天线发射机和单天线接收机，具有干扰的最佳下行链路传输总是简化为简单的波束成形方案。最后，我们注意到，类似的过程可以设计用于具有多于两对相互干扰的用户的系统。
We study in this paper optimal signaling for downlink transmission with mutual interference. Restricting each receiver to a single user detector, we show that computing the achievable rate region amounts to solving a family of non- convex optimization problems. Recognizing the intrinsic connection between the signal power at the intended receiver and the interference power at the unintended receiver, we convert the original family of non-convex optimization problems into a new family of convex optimization. Closed-form solutions to this new family of optimization problems are derived. Interestingly, with multiple-antenna transmitters and single-antenna receivers, the optimal downlink transmission with interference always reduces to a simple beamforming scheme. Finally, we note that similar procedure can be devised for systems with more than two pairs of mutually interfering users.