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A novel low rank LMMSE channel estimation method in OFDM systems

机译:OFDM系统中的新型低级LMMSE信道估计方法

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Orthogonal frequency division multiplexing (OFDM) has been widely used in modern wireless communication systems. In OFDM scheme, channel estimation method is a key technology in improving the accuracy of the channel estimation and the system performance. There are many channel estimation methods in OFDM system. The least square (LS) channel estimation method is relatively simple but it is susceptible to the noise of the wireless channel. The linear minimum mean square error (LMMSE) and approximate LMMSE (ALMMSE) channel estimation methods provide good performance but are much more complex than conventional LS method. This paper proposes a novel low rank LMMSE method to simplify the filtering matrix in LMMSE method and diagonal matrix in ALMMSE method. Performance comparison is shown to verify the effectiveness of the proposed low rank channel estimation method. LMMSE and ALMMSE channel estimation methods are better than LS method, and LS method is the worst. Except the ideal channel estimation method, the low rank LMMSE channel estimation method provides the best bit error rate (BER) performance in cyclic prefix - OFDM (CP-OFDM) system. It simplifies the calculation of channel auto-correlation matrix and provides superior system performance over multipath channel conditions.
机译:正交频分复用(OFDM)已广泛用于现代无线通信系统。在OFDM方案中,信道估计方法是提高信道估计准确性和系统性能的关键技术。 OFDM系统中有许多信道估计方法。最小二乘(LS)信道估计方法相对简单,但它易于无线信道的噪声影响。线性最小均方误差(LMMSE)和近似LMMSE(ALMMSE)信道估计方法提供良好的性能,但比传统LS方法更复杂。本文提出了一种新的低级LMMSE方法,以简化LMMSE方法中的滤波矩阵和ALMMSE方法中的对角矩阵。显示性能比较显示验证所提出的低秩信道估计方法的有效性。 LMMSE和ALMMSE信道估计方法优于LS方法,而LS方法是最糟糕的。除了理想的信道估计方法外,低等级LMMSE信道估计方法提供了循环前缀 - OFDM(CP-OFDM)系统中的最佳比特错误率(BER)性能。它简化了信道自相关矩阵的计算,并通过多径信道条件提供卓越的系统性能。

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