Abstract—Cognitive radio (CR) is a promising technology for improving the utilization of wireless spectrum resources. The key characteristic of CR system is that allowing unlicensed user to use licensed spectrum bands opportunistically without affecting their performance. The use of cooperative relay networks can help cognitive radios system to improve their utilization by reducing their transmit power. Here High Altitude Aeronautical Platforms (HAAP) cognitive relay are introduced in order to achieve cooperative diversity in the cognitive radar (CRs) system. This system typically consists of the Primary Radar, Target, the Cognitive HAAP Relays, and the Cognitive Controller. In this paper, the cooperative (Amplify and Forward AAF) strategy will be considered, which achieves diversity by using Maximal Ratio Combining (MRC). Performance metrics like probability of false alarm (Pf), probability of detection (Pd) and signal to noise ratio are evaluated. Matlab software simulations were carried out and the results illustrate that notable performance improvements compared to direct transmission (i.e., without HAAP cognitive relay assistance) are achieved by the proposed schemes, especially substantial performance improves with the increase of the number of HAAPs cognitive relay nodes.
 

Index Terms—cognitive radio, cooperative protocol, HAAP, radar, energy detection, relay
 

Cite: Ashagrie Getnet Flattie, "Effect of High Altitude Aeronautical Platforms with Cognitive Relay for Radar Performance," International Journal of Signal Processing Systems, Vol. 3, No. 2, pp. 159-165, December 2015. doi: 10.12720/ijsps.3.2.159-165