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针对正交频分复用系统对载波偏移非常敏感的问题,在分析基于类MUSIC载频偏移估计的基础上,提出了一种用遗传算法来实现类MUSIC的快速算法。在类MUSIC算法得到包含频偏的代价函数后,使用遗传算法求解代价函数获得频偏值。解决了使用空载波算法的多项式根运算量大、收敛速度慢的问题。仿真结果表明,在载频偏移初值相同的情况下,使用遗传算法的运算量是类MUSIC算法的1/4.5。
Aiming at the problem that the Orthogonal Frequency Division Multiplexing (OFDM) system is very sensitive to the carrier offset, a fast MUSIC algorithm based on MUSIC carrier frequency offset estimation is proposed. After the class MUSIC algorithm obtains the cost function containing the frequency offset, the genetic algorithm is used to solve the cost function to obtain the frequency offset value. It solves the problem of large amount of polynomial root operation and slow convergence speed using the null carrier algorithm. The simulation results show that the computational complexity using genetic algorithm is 1 / 4.5 of that of MUSIC algorithm under the same initial value of carrier frequency offset.