Outage probability analysis of cognitive relay network with four relay selection and end-to-end performance with modified quasi-orthogonal space-time coding

In this study, the authors evaluate the outage probability performance of an amplify-and-forward cooperative relay network where the relays are equipped with cognitive radios. When the number of available relays is more than four the authors use the channel conditions in order to select the best four cognitive relays from a set of M cognitive relay nodes and then they are used for cooperation between the source and the destination nodes. Expressions for outage probability are determined for a frequency flat Rayleigh-fading environment from the received signal-to-noise ratio with perfect and imperfect spectrum acquisition. In addition, a modified distributed quasi-orthogonal space–time block coding scheme with increased code gain distance is considered for use within the proposed cognitive relay network. To utilise the available spectrum opportunities with the modified quasi-orthogonal space–time block code, the code matrix can be adapted to the number of available relays. Simulation results show that the four relay selection improves the system performance. This is confirmed by the outage probability analysis. The simulations also show that the modified code can significantly enhance the performance of the system and improve the reliability of the link as compared with the conventional distributed quasi-orthogonal space–time block coding.

[1]  P.J. Smith,et al.  Exact Outage Probability of Cooperative Diversity with Opportunistic Spectrum Access , 2008, ICC Workshops - 2008 IEEE International Conference on Communications Workshops.

[2]  Mohamed-Slim Alouini,et al.  Performance analysis of two-hop relayed transmissions over Rayleigh fading channels , 2002, Proceedings IEEE 56th Vehicular Technology Conference.

[3]  Hamid Jafarkhani,et al.  Super-quasi-orthogonal space-time trellis codes for four transmit antennas , 2005, IEEE Transactions on Wireless Communications.

[4]  Dongwoo Kim,et al.  Outage Probability and Achievable Diversity Order of Opportunistic Relaying in Cognitive Secondary Radio Networks , 2012, IEEE Transactions on Communications.

[5]  Gregory W. Wornell,et al.  Cooperative diversity in wireless networks: Efficient protocols and outage behavior , 2004, IEEE Transactions on Information Theory.

[6]  H. Vincent Poor,et al.  Performance of selection relaying and cooperative diversity , 2009, IEEE Transactions on Wireless Communications.

[7]  Hyundong Shin,et al.  Cooperative Communications with Outage-Optimal Opportunistic Relaying , 2007, IEEE Transactions on Wireless Communications.

[8]  Yu Gong,et al.  Study of Relay Selection in a Multi-Cell Cognitive Network , 2013, IEEE Wireless Communications Letters.

[9]  Raviraj S. Adve,et al.  Outage Probability of Selection Cooperation in the Low to Medium SNR Regime , 2007, IEEE Communications Letters.

[10]  Andrea J. Goldsmith,et al.  Breaking Spectrum Gridlock With Cognitive Radios: An Information Theoretic Perspective , 2009, Proceedings of the IEEE.

[11]  Aggelos Bletsas,et al.  A simple Cooperative diversity method based on network path selection , 2005, IEEE Journal on Selected Areas in Communications.

[12]  Jonathon A. Chambers,et al.  Distributed quasi-orthogonal type space-time block coding with maximum distance property for two-way wireless relay networks , 2011, 2011 7th International Wireless Communications and Mobile Computing Conference.

[13]  Aria Nosratinia,et al.  Generalized block space-time trellis codes: set-partitioning and code design , 2005, IEEE Wireless Communications and Networking Conference, 2005.

[14]  Yindi Jing,et al.  Using Orthogonal and Quasi-Orthogonal Designs in Wireless Relay Networks , 2007, IEEE Transactions on Information Theory.

[15]  Kyounghwan Lee,et al.  Outage Performance of Cognitive Wireless Relay Networks , 2006 .

[16]  Qian Zhang,et al.  Cooperative relay to improve diversity in cognitive radio networks , 2009, IEEE Commun. Mag..

[17]  Aria Nosratinia,et al.  Efficient Space-Time Block Codes Derived from Quasi-Orthogonal Structures , 2007, IEEE Transactions on Wireless Communications.

[18]  Umberto Spagnolini,et al.  Cooperation and Cognitive Radio , 2007, 2007 IEEE International Conference on Communications.

[19]  Mostafa Kaveh,et al.  Exact symbol error probability of a Cooperative network in a Rayleigh-fading environment , 2004, IEEE Transactions on Wireless Communications.

[20]  Gregory W. Wornell,et al.  Energy-efficient antenna sharing and relaying for wireless networks , 2000, 2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540).

[21]  Amir Ghasemi,et al.  Fundamental limits of spectrum-sharing in fading environments , 2007, IEEE Transactions on Wireless Communications.

[22]  Wei Zhang,et al.  Power Control in Cognitive Radio Systems Based on Spectrum Sensing Side Information , 2007, 2007 IEEE International Conference on Communications.

[23]  Khaled Ben Letaief,et al.  Cooperative Communications for Cognitive Radio Networks , 2009, Proceedings of the IEEE.

[24]  Joseph Mitola,et al.  Cognitive radio: making software radios more personal , 1999, IEEE Wirel. Commun..

[25]  M. Faulkner,et al.  Outage probability analysis of a diamond relay network with opportunistic spectrum access , 2008, 2008 2nd International Conference on Signal Processing and Communication Systems.

[26]  A. Ghasemi,et al.  Collaborative spectrum sensing for opportunistic access in fading environments , 2005, First IEEE International Symposium on New Frontiers in Dynamic Spectrum Access Networks, 2005. DySPAN 2005..