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Retrieving Channel Reciprocity for Coordinated Multi-Point Transmission with Joint Processing

机译：联合处理检索多点协作的信道互易性

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摘要

In time division duplex coordinated multi-point transmission with joint processing (CoMP-JP) systems, the uplink-downlink channels are no longer reciprocal. Due to the difficulty of antenna calibration among the coordinated base stations (BSs), practical downlink channels differ from uplink channels by multiplicative ambiguity factors, which lead to severe performance degradation. In this paper, we propose an inter-BS antenna calibration strategy to facilitate downlink CoMP-JP transmission, whose basic idea is to estimate the ambiguity factors. To establish the observation equations for estimation, an extra uplink training frame except for the regular uplink and downlink frames is introduced, and existing signalling framework of limited feedback can also be reused. To improve the estimation performance, we can either select multiple users or employ multiple frames of one user to assist the calibration. After establishing the observation equations respectively with uplink training or limited feedback, the weighted least square criterion is used for estimation. We proceed to analyze and compare the mean square errors of the estimators, and provide a principle to select the users for assisting calibration. Simulation results show that the channel reciprocity is largely retrieved by the proposed antenna calibration strategy, which provides substantial throughput gain over the CoMP-JP systems without inter-BS calibration.
机译：在具有联合处理的时分双工协同多点传输（CoMP-JP）系统中，上行链路-下行链路信道不再是相互的。由于协作基站（BS）之间的天线校准困难，实际的下行链路信道与上行链路信道之间存在乘性歧义因子，从而导致性能严重下降。在本文中，我们提出了一种基站间天线校准策略，以促进下行链路CoMP-JP传输，其基本思想是估计歧义因子。为了建立用于估计的观测方程，除了常规的上下行帧之外，还引入了额外的上行训练帧，并且还可以重用现有的反馈受限的信令框架。为了提高估计性能，我们可以选择多个用户或使用一个用户的多个帧来协助校准。在分别通过上行链路训练或有限反馈建立观测方程后，将加权最小二乘准则用于估计。我们继续分析和比较估计量的均方误差，并提供一个原则来选择用户以帮助进行校准。仿真结果表明，所提出的天线校准策略可在很大程度上弥补信道互易性，从而在不进行BS间校准的情况下，在CoMP-JP系统上提供了可观的吞吐量增益。

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