DocumentCode :
3237630
Title :
Hybrid Combination of N-Continuous and Null-Space Precoding for Out-of-Band Emission Suppression
Author :
Zihao You ; Fang, Jianwu ; I-Tai Lu
Author_Institution :
Dept. of ECE, Polytech. Inst. of NYU, New York, NY, USA
fYear :
2013
fDate :
18-20 Nov. 2013
Firstpage :
1576
Lastpage :
1580
Abstract :
Orthogonal frequency division multiplexing (OFDM) based cognitive radio (CR) systems suffer from the large out-of-band emission (OOBE) that interferes with other users. Among the schemes that have been proposed to reduce the OOBE, precoding techniques encode the input data vectors before the inverse fast Fourier transform (IFFT) process, and decode them at the receiver after the fast Fourier transform (FFT) process. They provide significant OOBE suppression and do not cause any degradation of bit error rate (BER) performance. Therefore, two existing precoding techniques, which in this paper are called SVD precoding and N-continuous precoding, are investigated in this paper. Then a combined approach which maintains the merits of these two techniques is proposed. Numerical results show that, no matter whether there is a cyclic prefix (CP) or not, the proposed method gives significant further improvement on OOBE suppression and almost no extra degradation in the system performances such as the increase of BER or peak-to-average power ratio (PAPR) than either of the two original techniques.
Keywords :
OFDM modulation; cognitive radio; interference suppression; precoding; radiofrequency interference; singular value decomposition; N-continuous precoding; OFDM; SVD precoding; bit error rate performance; cognitive radio systems; fast Fourier transform process; input data vector; inverse fast Fourier transform; null space precoding; orthogonal frequency division multiplexing; out-of-band emission suppression; precoding technique; singular value decomposition; Bit error rate; Decoding; Encoding; Iterative decoding; Peak to average power ratio; Vectors; OFDM; cognitive radio; out-of-band emission; precoding;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Military Communications Conference, MILCOM 2013 - 2013 IEEE
Conference_Location :
San Diego, CA
Type :
conf
DOI :
10.1109/MILCOM.2013.266
Filename :
6735848
Link To Document :
بازگشت