M-APSK鉴相算法与并行载波同步方法  

M-APSK phase detection algorithm and parallel carrier synchronization method

作　　者：郇浩[1] 任科学 HUAN Hao;REN Kexue(School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学信息与电子学院,北京100081

出　　处：《通信学报》2024年第3期104-116,共13页Journal on Communications

基　　金：国家自然科学基金资助项目(No.62027801)。

摘　　要：为实现M进制幅相调制(M-APSK)体制下高阶调制信号的相位精细校正,将DVB-S2标准推荐的16APSK和32APSK的Q次方无数据辅助鉴相算法进行了扩展,以应用于64APSK、128APSK和256APSK等高阶调制。针对高阶调制的有效鉴相星座点占比较低时环路工作不稳定的问题提出了改进算法,通过对功率归一化后接收符号的幅值进行阈值判决,仅在高于阈值时进行鉴相,低于阈值时则不改变滤波器状态和相位补偿值,以提高星座点的鉴相有效性和可靠性,从而降低入锁门限。针对高速数传的符号速率非常高,而处理器的工作时钟频率相对较低的问题,提出了一种适用于M-APSK的并行载波同步方法,可以满足接收机工作时钟处理需要。相对于传统固定编码调制(CCM)的载波同步环路,该并行方法还可应用于可变编码调制(VCM)体制的频率跟踪。In order to realize the precise phase correction of high order modulation in M-APSK modem,the Q-power non-data aided phase detection method recommended by DVB-S2 standard for 16APSK and 32APSK was extended to 64APSK,128APSK and 256APSK.An improved algorithm was proposed to solve the problem of unstable loop operation when the proportion of constellation points used for phase detection in high-order modulation was low.By using threshold judgment on the amplitude of the received symbol after power normalization,phase detection was performed only when the amplitude was higher than the threshold,and the filter state and phase compensation value were not changed when the amplitude was lower than the threshold,so as to improve the phase detection effectiveness and reliability of constellation points and reduce the lock threshold.Aiming at the problem that the symbol rate of high-speed data transmission was very high but the working clock frequency of the processor was relatively low,a parallel carrier synchronization method for M-APSK was proposed,which could meet the needs of the receiver’s working clock.Compared with the traditional constant coding and modulation(CCM)carrier synchronization loop,the parallel method could also be applied to the frequency tracking of variable coding and modulation(VCM)system.

关 键 词：M进制幅相调制 鉴相 并行 载波同步 

分 类 号：TN911.8[电子电信—通信与信息系统]