CAJ | 학술논문

针对现有盲均衡算法大多仅适用于方形或十字形 QAM信号的问题，本文提出了一种适用于圆形高阶 QAM信号的混合盲均衡算法。该算法首先对区域多模盲均衡算法进行改进，提出了新的区域划分方法并将其与改进的多模盲均衡算法相结合，构造了新的误差模型使之与圆形星座匹配程度大大提高；然后将其与判决引导算法和数据重用技术有机结合，构成低稳态误差的快速混合盲均衡算法。与其他同类型盲均衡算法相比，本文算法对于圆形星座高阶 QAM信号尤为有效，不仅降低了稳态误差，且大幅度减少了收敛所需符号数。仿真结果验证了该算法的有效性。
침대현유맹균형산법대다부괄용우방형혹십자형 QAM신호적문제，본문제출료일충괄용우원형고계 QAM신호적혼합맹균형산법。해산법수선대구역다모맹균형산법진행개진，제출료신적구역화분방법병장기여개진적다모맹균형산법상결합，구조료신적오차모형사지여원형성좌필배정도대대제고；연후장기여판결인도산법화수거중용기술유궤결합，구성저은태오차적쾌속혼합맹균형산법。여기타동류형맹균형산법상비，본문산법대우원형성좌고계 QAM신호우위유효，불부강저료은태오차，차대폭도감소료수렴소수부호수。방진결과험증료해산법적유효성。
Aiming at equalizing circle high-order QAMsignals,a hybrid blind equalization algorithm based on region is proposed.The algorithm modified a region based multi-modulus blind equalization algorithm suitable for square QAM sig-nals by redividing the constellation and combines it with modified multi-modulus blind equalization algorithm to construct a new error function which matches the circle constellation well.Decision directed algorithm and data reusing are brought in to make up a hybrid blind equalization algorithm with low residual error and high convergence rate.Compared with other blind equalization algorithms,the new algorithm is more suitable for circle high-order QAMsignals.It not only reduces the residual error but also cut down the number of symbols needed to get convergence greatly.Simulation results prove the fea-sibility of the new algorithm.