Premium
Sensing OFDM systems with timing and frequency offset for cognitive radio networks
Author(s) -
Chen Zhong,
Yang LanJuan,
Zhang Yong,
Zhang XianDa
Publication year - 2014
Publication title -
international journal of communication systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.344
H-Index - 49
eISSN - 1099-1131
pISSN - 1074-5351
DOI - 10.1002/dac.2341
Subject(s) - cyclic prefix , computer science , cognitive radio , orthogonal frequency division multiplexing , frequency offset , multipath propagation , algorithm , offset (computer science) , likelihood ratio test , carrier frequency offset , electronic engineering , telecommunications , statistics , mathematics , wireless , channel (broadcasting) , engineering , programming language
SUMMARY In this paper, we consider the detection of orthogonal frequency division multiplexing with timing and frequency offset for cognitive radio over fast time‐varying multipath channels. By making different assumptions on the availability of the timing and frequency offset at the secondary user, we derive two algorithms based on likelihood ratio test and generalized likelihood ratio test, respectively and theoretically obtain the detection performances of them. The proposed algorithms jointly utilize energy of observations and correlation of the cyclic prefix (CP) data. The extensive simulations show that the two algorithms outperform the other CP‐based methods, perform well at very low signal to noise ratio (SNR) and are robust to the CP ratio. Copyright © 2012 John Wiley & Sons, Ltd.