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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 WPDM system is analyzed, and a SNR estimation method suitable for WPDM system is proposed. According to the tightness of the subcarrier structure of the system, the noise power is estimated outside the support period of the wavelet packet subcarrier, and the estimated SNR of each subcarrier is obtained. Finally, the average signal to noise ratio of the system is obtained. Under the time-frequency selective fading channel, the simulation results show that the proposed method has high estimation accuracy and wide estimation range, and the estimation performance is less affected by the channel fading characteristics.