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Study on feedback reduction techniques in MIMO-OFDM beamforming systems

机译:MIMO-OFDM波束成形系统中的反馈减少技术研究

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摘要

In multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM) systems, the recursive feedback encoding method is proposed to reduce the feedback overhead by using a small-size codebook. However, the recursive feedback encoding method will introduce error propagation in the case where the channel frequency response (CFR) has abrupt changes between adjacent subcarriers. In order to overcome this problem, we propose a periodic recursive feedback encoding method in this paper. Through using a full-size codebook periodically across subcarriers, the error propagation problem can be avoided. Additionally, we propose a modified clustering method to reduce the feedback load. In this method, the receiver informs the transmitter of new optimal precoding matrix only when the current optimal precoding matrix is different from the former, which makes the feedback more efficient. Simulation results demonstrate the effective of our proposed approaches.
机译:在多输入多输出正交频分复用(MIMO-OFDM)系统中,提出了一种递归反馈编码方法,以通过使用小型码本来减少反馈开销。然而,在信道频率响应(CFR)在相邻子载波之间具有突然变化的情况下,递归反馈编码方法将引入误差传播。为了克服这个问题,本文提出了一种周期性的递归反馈编码方法。通过周期性地跨子载波使用全尺寸码本,可以避免错误传播问题。另外,我们提出了一种改进的聚类方法来减少反馈负载。在这种方法中,只有当当前最优预编码矩阵与前者不同时,接收机才将新的最优预编码矩阵通知给发射机,从而使反馈更加有效。仿真结果证明了我们提出的方法的有效性。

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