When two users transmit signals to a common receiver, one can design precoders to cancel the interference for each user if each user knows all the channel information perfectly. Also the diversity for each user is full. However, in practice, perfect channel information is not available. In this paper, we design precoders for two users with two transmit antennas and one receiver with two receive antennas using quantized feedback. We propose to construct a codebook using Grassmannian line packing. By choosing precoders from the codebook properly, our proposed scheme can cancel the interference and achieve full diversity for each user. Simulation results confirm our analytical proof.
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机译：当两个用户向公共接收器发送信号时，如果每个用户都完全了解所有信道信息，则可以设计预编码器以消除每个用户的干扰。每个用户的多样性也很丰富。但是，实际上，没有完美的频道信息。在本文中，我们使用量化反馈为两个用户设计了两个带有两个发射天线的用户和一个接收器带有两个接收天线的预编码器。我们建议使用Grassmannian Line Packing构建一本密码本。通过从码本中正确选择预编码器，我们提出的方案可以消除干扰并为每个用户实现完全分集。仿真结果证实了我们的分析证明。
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