一种改进载波相位恢复算法

为了解决载波相位恢复算法频偏估计范围小、估计精度低、计算复杂度高等问题,提出了一种基于Q次方的极性环与极性判决(Polar Decision,PD)算法相结合的Q次方极性判决(Q-th Power Polarity Decision,QPD)算法.首先对判决导向(Decision Directed,DD)算法、PD算法、基于Q次方的极性环进行性能分析;然后结合基于Q次方的极性环和PD算法的优点,提出性能更好的QPD算法,并分别在不同频偏和不同信噪比条件下对这四种载波相位恢复算法进行性能仿真与性能比较;最后,在QPSK、8PSK、16APSK和32APSK这四种调制方式下,分析QPD算法的误码率、资源消耗和吞吐率.仿真结果表明,该算法相比于DD算法、PD算法、基于Q次方的极性环具有频偏估计范围较大、估计精度较高、资源消耗相对较少、吞吐率较高等特点,且适用于多种调制方式.

An improved carrier phase recovery algorithm

In order to solve the problems such as small frequency offset estimation range,low estimation accuracy,and high computational complexity of the carrier phase recovery algorithm,a Q-th power polarity decision(QPD) algorithm based on the combination of polar decision(PD) algorithm and polar ring based on Q-th power is proposed.Firstly,the performance of decision directed(DD) algorithm,PD algorithm and polar ring based on Q-th power is analyzed.Then,by combining the advantages of polar ring based on Q-th power and PD algorithm,the QPD algorithm with better performance is proposed.In addition,the performance of these four carrier phase recovery algorithms is simulated and compared under different frequency offsets and different signal-to-noise ratio(SNR) conditions.Finally,the error symbol rate,resource consumption and throughput rate of the QPD algorithm are analyzed under the four modulation modes of QPSK,8PSK,16APSK and 32APSK.The simulation results show that compared with the DD algorithm,PD algorithm and the polar ring based on Q-th power,the algorithm has the characteristics of larger frequency offset estimation range,higher estimation accuracy,relatively less resource consumption,higher throughput rate,and is suitable for multiple modulation modes.