摘要
幅相键控调制系统中,为消除码间干扰,并解决高阶调制信号多模值的匹配问题,本文基于均衡器输出功率的线性变换定义新的代价函数,使用抑制低误差函数项的方法构造新的梯度函数,进而提出了新的均衡算法。该算法通过解决信号多模值与算法散度常量的匹配问题,提高收敛速度和降低稳态均方误差;通过抑制低误差函数项的方法,保证收敛过程的稳定。仿真结果表明,针对16-APSK调制信号,本文算法在保证收敛稳定性的同时,其均衡性能较恒模算法也有显著的提高。
To eliminate inter-symbol interference and match the multi-modulus of high-ordered modulation signals, a new constant modulus algorithm is proposed for the Amplitude Phase Shift Keying system. The algorithm includes both a new cost function de-fined by changing the power of equalizer output and a new gradient function defined by restraining the low error function. The per-formance of proposed algorithm is improved by matching the dispersion constant of algorithm and the multi-modulus of high-order modulation signals. The algorithm becomes robust by restraining low error function term. Simulation results with 16-APSK modu-lation models demonstrate that the proposed algorithm obtains better performance on the residual inter-symbol interference and the convergence rate than other algorithms.
出处
《燕山大学学报》
CAS
2014年第3期259-266,共8页
Journal of Yanshan University
基金
河北省自然科学基金资助项目(D2013203363)
关键词
恒模算法
盲均衡
功率变换
误差函数
constant modulus algorithm
blind equalization
power transform
error function
