一种改进的水声信道盲均衡算法

Modified Blind Equalization Algorithm for Underwater Acoustic Channel

针对多径水声信道会产生严重码间干扰的问题,提出了一种改进的恒模盲均衡算法,该算法结合变步长思想和动量算法的原理加快收敛速度,利用代价函数的实、虚部分别计算来校正水声信道引入的相位旋转。通过仿真,验证了该算法能够恢复水声信道引起的相位旋转而且具有较快的收敛速度和较低的剩余码间干扰。

For the multipath underwater acoustic channel producing serious inter symbol interference problem, an im- proved constant modulus blind equalization algorithm is proposed. The algorithm combines the variable step size theory and momentum algorithm to accelerate the convergence rate, and uses the real part and imaginary part of cost function calculat- ing respectively to correct the phase rotation caused by the underwater acoustic channel. The simulation result shows that, the algorithm is able to recover the phase rotation caused by the underwater acoustic channel and has faster convergence rate and lower residual inter symbol interference.