对小波包分复用(WPDM)系统结构进行了分析, 提出了一种适用于WPDM系统的信噪比(SNR)估计方法。根据系统子载波结构的紧支性, 在小波包子载波支撑区间外估计噪声功率, 求出各子载波信噪比估计值, 最后得到系统的平均信噪比。在时间和频率选择性衰落信道下, 仿真结果表明, 该方法估计精度高, 估计范围广, 且估计性能受信道衰落特性影响较小。

The structure of wavelet packet division multiplexing (WPDM) system was analyzed, and a new signal-to-noise ratio(SNR) estimation method for WPDM system was proposed. According to the tight supporting nature of subcarrier, noise power was estimated outside the supporting interval of wavelet-packet subcarrier, and the SNR estimated value of each subcarrier was calculated and the SNR mean value of the system was obtained finally. In the time and frequency selective fading channel, simulation results show that the proposed method has high precision and wide estimation range, and the estimation performance is less affected by channel fading.