Block Turbo code modulation for MB-OFDM-based cognitive radio to suppress its side-band interferences  

作　　者：YANG Cheng 

机构地区：[1]Key Laboratory of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China [2]Wireless Network Laboratory, Beijing University of Posts and Telecommunications, Beijing 100876, China

出　　处：《The Journal of China Universities of Posts and Telecommunications》2009年第2期29-34,共6页中国邮电高校学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(60432040,60772021);the Research Fund forthe Doctoral Program of Higher Education(20060013008);University IT Research Center Project(INHA UWB-ITRC),Korea,and the Project iCHIP financed by Italian Ministry of Foreign Affairs,the Innovation Fund for Graduate Student of Bupt,China

摘　　要：To suppress the side-band interferences caused by multiband orthogonal frequency division multiplexing （MB-OFDM）-based cognitive radio systems, a mathematical expression of the side-band signal is derived. Based on this expression, the constraints among the transmitted symbols, which help to suppress the interferences, are obtained. Combined with the constraints, a type of block Turbo code modulation scheme is proposed. In the modulation scheme, the side-band interferences are attenuated quickly. Compared with other techniques, in this scheme, the interference suppression is implemented more easily and sufficiently. Simultaneously, the bit error rate （BER） performance can be improved. Theoretical analyses and simulation results show that it is highly applicable for MB-OFDM-based cognitive radio systems to suffer from Rayleigh fading.To suppress the side-band interferences caused by multiband orthogonal frequency division multiplexing （MB-OFDM）-based cognitive radio systems, a mathematical expression of the side-band signal is derived. Based on this expression, the constraints among the transmitted symbols, which help to suppress the interferences, are obtained. Combined with the constraints, a type of block Turbo code modulation scheme is proposed. In the modulation scheme, the side-band interferences are attenuated quickly. Compared with other techniques, in this scheme, the interference suppression is implemented more easily and sufficiently. Simultaneously, the bit error rate （BER） performance can be improved. Theoretical analyses and simulation results show that it is highly applicable for MB-OFDM-based cognitive radio systems to suffer from Rayleigh fading.

关 键 词：MB-OFDM cognitive radio block Turbo code modulation BER performance 

分 类 号：TN911.22[电子电信—通信与信息系统] TN925.93[电子电信—信息与通信工程]