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Hierarchy precoder design for multi-cell multiuser multiple-input–multiple-output wireless networks with interference alignment

机译:具有干扰对准的多小区多用户多输入多输出无线网络的分层预编码器设计

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摘要

A hierarchy precoding approach is proposed in this study for multi-cell multiuser systems with any number of base stations and that of users, which is suitable for any number of data streams. The key feature of this approach is aligning the inter-user interferences within the same cell to the room spanned by the inter-cell interferences, by which both the inter-cell and inter-user interferences are cancelled simultaneously. Then, the inter-stream interference for each user can be easily tackled. It is found that the interference alignment-based hierarchy precoder achieves to the full freedom of degree. With interference-free transmissions achieved by the proposed precoder, the transmit power is optimised in an analytical expression by maximising the sum rate and minimising the sum weighted mean square error. Extensive simulations demonstrate the effectiveness of the proposed method.
机译:在这项研究中,提出了一种分层预编码方法,适用于具有任意数量的基站和用户数量的多小区多用户系统,适用于任意数量的数据流。该方法的关键特征是将同一小区内的用户间干扰与小区间干扰所跨越的房间对齐,从而同时消除小区间干扰和用户间干扰。然后,可以容易地解决每个用户的流间干扰。发现基于干扰对准的分层预编码器达到了完全的自由度。利用所提出的预编码器实现的无干扰传输,可以通过使总和率最大化和总和加权均方误差最小化,在解析表达式中优化发射功率。大量的仿真证明了该方法的有效性。

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