【摘要】 FQPSK是针对高频谱效率和高功率效率要求产生的一种调制方式。分析了其调制原理,和体制性能,与其他体制作了简单比较,并针对解调结合现有算法,提出了载波同步和定时同步的实现。其中位定时与载波频偏的联合估计基于高速样点法,而初始相位差的估计通过非线性变换并取模实现。计算机仿真结果表明,该方法是可行的,适合DSP实现。更多还原

【Abstract】 FQPSK is a modulation technique that fits for high spectrum efficiency and high power efficiency request. The technical principle and performance of the modulation system were analyzed. Then the performance of the system was compared with the other systems, and a kind of time synchronization and carrier wave synchronization method was introduced. The combined estimate of time synchronization and frequency offset is based on high-speed sample method, and the estimate of initial phase is based on non-linear transform. The results of computer simulation indicate that this method is feasible and suits the implement in DSP.更多还原