Abstract
A significant challenge of cognitive radio (CR) is to perform wideband spectrum sensing in a fading environment. In this paper, a novel multi-rate sub-Nyquist spectrum detection(MSSD) system is introduced for cooperative wideband spectrum sensing in a distributed CR network. Using only a few sub- Nyquist samples, MSSD is able to sense the wideband spectrum without full spectrum recovery. Specifically, given the low spectral occupancy, sub-Nyquist sampling is performed in each sampling channel and a test statistic is formed by using sub-Nyquist samples from multiple sampling channels. Furthermore, the use of different sub-Nyquist sampling rates is proposed to improve the system detection performance, and the performance of MSSD over both non-fading and Rayleigh fading channels is analyzed. Numerical results show that MSSD can considerably improve the wideband spectrum sensing performance in a fading scenario, with a relatively low implementation complexity and a low computational complexity.
| Original language | English |
|---|---|
| Title of host publication | 2011 IEEE Global Telecommunications Conference - GLOBECOM 2011 |
| Publisher | IEEE |
| ISBN (Electronic) | 978-1-4244-9268-8 |
| ISBN (Print) | 978-1-4244-9266-4 |
| DOIs | |
| Publication status | Published - 19 Jan 2012 |
Keywords
- cognitive radio
- cooperative communication
- Rayleigh channels
- statistical analysis
- distributed cognitive radio networks
- fading environment
- multirate sub-Nyquist spectrum detection system
- MSSD system
- cooperative wideband spectrum sensing
- CR network
- test statistic
- sub-Nyquist sampling rates
- Rayleigh fading channels
- computational complexity
- Wideband
- Sensors
- Fading
- Signal to noise ratio
- Educational institutions
- Cognitive radio
- Computational complexity