Integer-forcing linear receivers
Integer-forcing linear receivers
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DOI：
10.1109/isit.2010.5513734
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发表时间：
2010-03
期刊：
影响因子：
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通讯作者：
Jiening Zhan;B. Nazer;U. Erez;M. Gastpar
中科院分区：
文献类型：
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作者：
Jiening Zhan;B. Nazer;U. Erez;M. Gastpar
线性接收机常用于降低多天线系统的实现复杂性。在传统的线性接收机结构中，接收天线用于分离每个发射天线发送的码字，然后可以单独解码。虽然很容易实现，但当信道矩阵接近奇异时，这种方法可能非常不理想。在本文中，我们开发了一种新的线性架构，它使用接收天线来创建一个具有整数项的有效信道矩阵。每个解码器不是试图直接恢复传输的码字，而是根据有效信道矩阵恢复码字的不同整数组合。如果有效信道是满秩的，这些线性方程可以对原始码字进行数字求解。通过允许接收器将信道均衡到任何具有整数项的矩阵，该方案可以在保持类似复杂性的同时优于传统的线性架构，如去相关器和MMSE接收器。此外，在每个发射天线编码独立数据流的情况下，所提出的接收机实现了最佳的分集复用权衡。
Linear receivers are often used to reduce the implementation complexity of multiple antenna systems. In a traditional linear receiver architecture, the receive antennas are used to separate out the codewords sent by each transmit antenna, which can then be decoded individually. Although easy to implement, this approach can be highly sub-optimal when the channel matrix is near singular. In this paper, we develop a new linear architecture that uses the receive antennas to create an effective channel matrix with integer-valued entries. Instead of attempting to recover a transmitted codeword directly, each decoder recovers a different integer combination of the codewords according to the effective channel matrix. If the effective channel is full rank, these linear equations can be digitally solved for the original codewords. By allowing the receiver to equalize the channel to any matrix with integer entries, this scheme can outperform traditional linear architectures such as decorrelators and MMSE receivers while maintaining a similar complexity. Furthermore, in the case where each transmit antenna encodes an independent data stream, the proposed receiver attains the optimal diversity multiplexing tradeoff.