针对8移相键控(PSK)和16振幅移相键控(APSK)信号的频偏估计及误比特率，介绍了高阶的恒包络数字调制方式8PSK和16APSK，重点研究2种调制信号的频偏估计，并搭建通信链路模型。采用Matlab对8PSK,16APSK调制信号在加性高斯白噪声下的频偏估计进行仿真分析，并使用频偏估计得到的载波频率进行相干解调，最后对比分析实际误比特率与理论误比特率。仿真结果表明：在不同信噪比的加性高斯白噪声信道条件下，8PSK的抗噪声性能比16APSK好；采用本文给出的频偏估计方法能够较好地接近理论误比特率，为设计通信系统提供依据。

In order to study frequency offset estimation and Bit Error Rate(BER) of 8 Phase Shift Keying(8PSK) and 16 Amplitude Phase Shift Keying(16APSK) signals，two high-order constant envelope digital modulation methods 8PSK and 16APSK are introduced firstly，and then their frequency offset estimation is investigated. The communication link model is built to simulate the performance. Matrix Laboratory(Matlab) is utilized to simulate and analyze the frequency offset estimation of 8PSK and 16APSK modulation signals, under Additive Gaussion White Noise. Then coherent demodulation is conducted with the carrier frequency obtained by the frequency offset estimation. Finally, the actual bit error rate and theoretical bit error rate are compared and analyzed. Simulation results demonstrate that the noise immunity of 8PSK is better than that of 16APSK, under the condition of Additive Gaussion White Noise channel with different Signal-Noise Ratios(SNR). The performance of the frequency offset estimation method proposed in this paper approaches the theoretical value. This paper provides a reference for the design of communication systems.