A frequency hopping spread spectrum transmission scheme for uncoordinated cognitive radios

Xiaohua Li, Juite Hwu
2009 2009 IEEE International Conference on Acoustics, Speech and Signal Processing  
One of the major challenges to cognitive radios is the synchronization of distributed radios onto the same spectrum white spaces which vary in time and space. In this paper, we propose a frequencyhopping spread spectrum transmission scheme which works reliably without any a priori handshaking assumption. Each cognitive radio independently detects white spaces, and then selects one of them to transmit or receive signals according to a pre-defined frequency hopping pattern. While exploiting the
more » ... le exploiting the reliability of the white space detection capability of cognitive radios, the new scheme is robust to even large detection errors. According to the accuracy of the spectrum sensing, both the secondary data rate and the interference to primary users can be optimized by adjusting the spreading gain. Its performance is analyzed and demonstrated by simulations. Index Terms-cognitive radio, dynamic spectrum access, frequency hopping, frequency shift keying, synchronization
doi:10.1109/icassp.2009.4960091 dblp:conf/icassp/LiH09 fatcat:sf6z6y3tcvh3jhottjswsnvr5a