江苏大学学报（自然科学版）2011，Vol.32Issue(4)：443-448,6.DOI:10.3969/j.issn.1671-7775.2011.04.014
SOQPSK信号的定时相位联合估计算法
Joint timing and phase estimation algorithm for SOQPSK signals
摘要
Abstract
To solve the difficulty and complexity of synchronization problem in ternary shaped -offset quadrature phase shift keying( SOQPSK) , a decision-directed joint timing and carrier phase estimation algorithm was proposed. Based on Laurent representation of SOQPSK, the symbol sequence was recovered by maximum likelihood sequence detection ( MLSD). The joint likelihood functions of timing and carrier phase parameter were simplified into the likelihood function of timing parameter. The estimated timing value was then recovered by parallel searching method to obtain the estimated value of carrier phase. According to the common signals of full response SOQPSK-MIL and partial response SOQPSK-TG, the complexity-reduction implementation scheme of joint timing and carrier phase estimation algorithm was proposed. Simulation was completed under additive white Gaussian noise(AWGN) channel. The results show that the proposed algorithm is suitable for SOQPSK-MIL and SOQPSK-TG. The timing error variance, curve is close to the theoretical limit. The carrier phase error variance is at 10-3 - 10-4 order of magnitude with timing offset, and close to theoretical limit without timing offset. Carrier phase error has little effect on the timing recovery algorithm.关键词
SOQPSK/定时恢复/载波相位估计/Laurent分解/最大似然/面向判决Key words
SOQPSK/ liming recovery/ carrier phase estimation/ Laurent expansion/ maximum likelihood/ decision-directed分类
信息技术与安全科学引用本文复制引用
刘晓明,汪梦柔,吴皓威,何徽..SOQPSK信号的定时相位联合估计算法[J].江苏大学学报（自然科学版）,2011,32(4):443-448,6.基金项目
国家自然科学基金资助项目(51035008) （51035008）
