A novel scheme for relay cooperation in interweave cognitive radio systems

Author

Naguib, Ahmed A. ; Elezabi, Ayman ; Nafie, Mohammed

Author_Institution

Cairo Univ., Cairo, Egypt

fYear

2010

fDate

7-10 Nov. 2010

Firstpage

1

Lastpage

5

Abstract

In this paper, we investigate the benefits of using cooperative relays in interweave (opportunistic) cognitive radio systems. A novel distributed space frequency (DSF) code for relay cooperation is presented. The code is designed to be a multi-user multi-OFDM channels code. It achieves a cooperative diversity gain of order NL for all users, where N is the number of relays and L is the number of paths in the multi-path fading channel. Simulation results show that using this DSF code by relays in the proposed system significantly increases system throughput. This code depends on transmitting the signal of each secondary user on a number of channels. Hence, each source will be less sensitive to spatial and temporal variations in channels availability which is one of the main problems in interweave cognitive radio systems.

Keywords

OFDM modulation; channel coding; cognitive radio; cooperative communication; diversity reception; fading channels; modulation coding; multipath channels; cooperative diversity gain; distributed space frequency code; interweave cognitive radio systems; multi-user multi-OFDM channels code; multipath fading channel; relay cooperation; system throughput; Interweave cognitive radio; cooperative relays; distributed space frequency code;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Sciences in Biomedical and Communication Technologies (ISABEL), 2010 3rd International Symposium on

Conference_Location

Rome

Print_ISBN

978-1-4244-8131-6

Type

conf

DOI

10.1109/ISABEL.2010.5702764

Filename

5702764