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Low-Complexity Iterative Channel Estimation for Turbo Receivers

机译：Turbo接收机的低复杂度迭代信道估计

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摘要

This letter discusses a receiver-side channel estimation algorithm well-suited to turbo equalizers for multiple-input multiple-output (MIMO) systems. The proposed technique is a Kalman-based channel estimator that runs on parallel single-input single-output (SISO) channels. Soft-decision-feedback interference cancellation is utilized to reduce the MIMO channel estimation problem into multiple SISO channel estimation problems. Unlike existing methods, however, the inherent correlation that exists among the output samples of the successive interference canceller is suppressed via careful puncturing of observation samples. The quality of soft decisions and channel estimates are also continuously monitored and incorporated in the Kalman filter update process.
机译：这封信讨论了一种适用于多输入多输出（MIMO）系统的Turbo均衡器的接收机侧信道估计算法。所提出的技术是基于卡尔曼的信道估计器，其在并行单输入单输出（SISO）信道上运行。利用软决策反馈干扰消除将MIMO信道估计问题简化为多个SISO信道估计问题。但是，与现有方法不同，通过仔细地对观察样本进行打孔来抑制连续干扰消除器的输出样本之间存在的固有相关性。软决策和信道估计的质量也得到持续监控，并纳入卡尔曼滤波器更新过程。

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