The Open Electrical & Electronic Engineering Journal

2008, 2 : 62-65
Published online 2008 July 11. DOI: 10.2174/1874129000802010062
Publisher ID: TOEEJ-2-62

Hard-Decision Based Reporting Method For Limited Band Control Channel in Cooperative Cognitive Radio Networks

R.A. Mokhtar , S. Khatun , B.M. Ali and A. Ramli
Department of Computer and Communications Systems Engineering, Faculty of Engineering, University Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia.

ABSTRACT

In the context of cognitive radio the cooperative spectrum sensing has been proposed to overcome the problem associated with the local sensing for example the hidden node problem due to noise uncertainty, fading, and shadowing. However, sensing results reporting requires perfect channel to avoid the performance degradation. It also requires a large bandwidth under the hypothesis of large number of cognitive user. This paper presents a hard decision auto-correction reporting scheme that able to correct the error in the reported bit directly. This system further minimizes the average number of the reporting bits by allowing only the user with detection information (binary decision 1) to report its result. The sensing performance is investigated and the numerical result shows significant decrease in reporting bits without affecting the sensing performance.

Keywords:

Smart cards, elliptic curve digital signature algorithm, LEON2 processor.