多载波通信系统的实用功率分配算法.PDFVIP

6 Vol .30 No. 6 2002 6 ACTA ELECTRONICA SINICA June 2002 1 1 2 郑紫微 , 朱义胜 , 杨知行 ( 1 , 116026; 2, 100084) : . , , . , , . , . : ; ; ; ; : TN911 : A : ( 2002) A Practical Power Allocation Algorithm for Multicarrier Communication Systems 1 1 2 ZHENG Ziwei , ZHU Yisheng , YANG Zhi ing ( 1College of Inf ormation Engineering, Dalian Maritime University, Dalian, Liaoning 116026, China; 2State Key Lab on Microwave Digital Comm nications , Tsingh a Univ, Beij ing 100084, China) Abstract: In this paper, an efficient table lookup method is proposed by using the relationship among biterrorrate, bits and signaltonoise. Considering the aggregate spectral density of all the channel impairments, the channel attenuation and the constraint of power spectral density to the ma imum bit rates of subchannels, a bit loading and power allocation algorithm is proposed for DMT based multicarrier communication system. During initialization, the proposed algorithm enables the system with optimal power allocation and bit loading within all constraints.The proposed algorithm converges faster to the optimal solution than some of the e isting tech niques because of more efficient computation.The system performance margin is improved by the constraint of power spectral density to the ma imum bit rates of subchannels. For tracking scenarios, the proposed algorithm makes the system with ability of fast adaptive bit swap without additional system hardware. Key words: multicarrie