基于TD-LTE系统的新型信噪比估计算法

针对TD-LTE系统频域映射时域加噪的特性,采用频域分离噪声的方法进行信噪比(SNR)估计,并将经典的盲估计二阶四阶矩(M2M4)算法推广到适合TD-LTE系统中,最后在AWGN和EPA信道模型下进行仿真。结果表明,推广的M2M4算法可以应用于TD-LTE系统AWGN信道,频域去噪算法不仅能够准确地估计SNR,而且可以适用于不同信道环境。该实现方法已应用于LTE-TDD无线综合测试仪表的开发中。

Novel SNR estimation based on TD-LTE systems

Based on the character, mapping to resource elements in frequence domain and adding noise in time domain, in TD-LTE systems, this paper presented signal to noise ratio SNR estimation algorithm by using separating noise from received signal in frequency domain to estimate noise average power. What is more, non-data estimation M2M4 was extended to the systems of TD-LTE . Finally, simulation result shows that extended M2M4 algorithm can be used in AWGN channel model, and the novel algorithm not only has more accurately estimate SNR, but also can satisfy performance requirement under different channel environment. The method had been applied to LTE-TDD wireless integrated test instrument development.