一种适用于电缆通信的自适应比特分配算法  

An adaptive bit allocation algorithm suitable for cable communication

作　　者：刘豆豆 刘得军[1] 程星 闫松[1] 王辰 LIU Doudou;LIU Dejun;CHENG Xing;YAN Song;WANG Chen(China University of Petroleum,Beijing 102249,China)

机构地区：[1]中国石油大学(北京),北京102249

出　　处：《现代电子技术》2018年第21期21-24,共4页Modern Electronics Technique

基　　金：国家重大科研装备研制项目:深部资源探测核心装备研发(ZDYZ2012-1-07-02-01)~~

摘　　要：在研究电缆通信系统特性的基础上,提出一种新的算法——比例贪婪算法。该算法根据信噪比及信噪比间隔求得功率分配比例系数,然后求得各子信道功率分配方案,再进一步求得离散整数比特及对应功率,最后将因比特取整剩余的功率用贪婪算法逐比特分配,将求得的离散比特分配用于信息的调制与解调。该算法考虑到了信噪比间隔在不同调制方式下的变化,经过Matlab仿真,在相同信噪比条件下该算法的误码率比固定调制方式算法小,并且该算法迭代次数少,计算量小。A new proportional greedy algorithm is presented on the basis of studying the characteristics of cable communication system.The power distribution proportionality coefficient is obtained according to the signal-to-noise ratio(SNR)and SNR gap,then the power allocation scheme of each sub-channel is acquired,and the disperse integer bit and its corresponding power are gotten.The greedy algorithm is used to perform the bit-by-bit allocation for the residual power obtained by bit integer.The obtained disperse bit allocation is used to the modulation and demodulation of information.The change of SNR gap in different modulation modes is taken into account in the algorithm.The Matlab simulation results show that,in comparison with the algorithm with fixed modulation mode,the proposed algorithm has lower bit error rate(BER),less iteration times and calculation amount under the same SNR condition.

关 键 词：信噪比 信噪比间隔 比例贪婪算法 功率分配 电缆通信 自适应 

分 类 号：TN914-34[电子电信—通信与信息系统]