In MIMO-OFDM systems, knowledge of the precoding matrix enables effective resource allocation for high rates and low BER. However, feeding back precoders for all subcarriers introduces large overheads. Past work has shown that the orthonormal structure of the precoder enables effective parameterization and quantization using Givens rotations and Householder transformations. Also, the use of temporal and frequency correlations can further reduce the feedback requirements. We present a framework that utilizes adaptive feedback with joint time-frequency prediction for precoder construction at the transmitter. Simulations reveal that the proposed method achieves significantly lower BERs for various channel profiles compared to other approaches.

中文翻译：

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用于 MIMO-OFDM 系统的基于标量反馈的联合时频预编码器内插

在 MIMO-OFDM 系统中，预编码矩阵的知识能够为高速率和低 BER 进行有效的资源分配。然而，所有子载波的反馈预编码器引入了大量开销。过去的工作表明，预编码器的正交结构可以使用 Givens 旋转和 Householder 变换实现有效的参数化和量化。此外，时间和频率相关性的使用可以进一步降低反馈要求。我们提出了一个框架，该框架利用自适应反馈和联合时频预测来构建发射机的预编码器。仿真表明，与其他方法相比，所提出的方法针对各种信道配置文件实现了显着较低的 BER。