摘要
针对时分复用(TDM)-正交频分复用(OFDM)自适应调制系统,提出一种通过统计星座点分布特征对调制方式进行识别的方法。并针对载波同步时初相跳变导致的锁相环失锁问题,通过预置相位参数纠正该相位差,使锁相环稳定入锁。仿真结果表明,该方法能有效地解决该类自适应调制信号的子载波调制模式识别和载波同步问题,易于软硬件实现。
A demodulation algorithm is proposed for adaptive modulation Time Division Multiplexing （TDM） - Orthogonal Frequency Division Multiplexing （ OFDM ） system. The modulation modes of subcarrier are recognized through constellation points statistics. To solve the losing lock problem of phase - locked loop during carder synchronization which is caused by the initial phase jump, the parameter is preset to correct the phase error and to ensure the steadily locking of the loop. The simulation result indicates that the proposed method is able to achieve recognition of the subcarrier modulation modes and the carrier synchronization for this certain adaptive modulation signals effectively and is easy to implement in software and hardware platforms.
出处
《系统仿真技术》
2015年第2期137-143,共7页
System Simulation Technology
关键词
针对时分复用-正交频分复用
自适应调制
调制模式识别
载波同步
time division multiplexing-orthogonal freguency division multiplexing
adaptivemodulation
recognition of modulation mode
carrier synchronization
