MB_OFDM认知无线电子载波编码技术.pdfVIP

2010 12 Dec. 2010 33 6 Journal of Beijing University of Posts andTelecommunications Vol. 33 o. 6 : 2010) MBOFDM 赵成林, 张学川, 孙学斌, 蒋 挺 ((), 100876) : (OFDM ), OFDM . 2, 2 ,. , , . : ; ; : T 91121 : A A Subcarriers Coding Technique forMBOFDM Cognitive Radio ZHAO Chenglin, ZHA G Xuechuan, SU Xuebin, JIA G Ting (K ey Laboratory ofU niversalW ireless Communication ( BeijingUniversity of Posts and Telecommunications), M inistry of Education, Beijing 100876, China) Abstract: For the problem of intercarrier interference in orthogonal frequency division multiplexing (OFDM ) signalsof cognitive radio systems, a codingm ethod for enhancing spectrum notch ofOFDM sig nals is proposed. The sam e dates are transm itted on the wt o adjacent subcarriers, and then weight the dates on the two adjacent subcarriers to m ake their sidelobes cancel each other out at the frequency of spectrum notch, so as to reduce thepower spectrum at specific frequency. Theoretic analysis and smi ula tion results show that, not only themethod can enhance the spectrum notch but also has a good perform ance of antinoise. K ey words: orthogonal frequency divisionmultiplexing; spectrum notch; cognitive radio , ; [ 4] . . (MB . [ 5] OFDM) , [ 1] , . , . , . 1 MBOFDM, Sinc , 1T , OFDM . , [ 2] N- 1 j2(f c+f k ) t+