Revisiting Incremental Relaying and Relay Selection for Underlay Cognitive Radio

Cooperative relaying combined with selection exploits spatial diversity to improve the performance of interference-constrained secondary users in an underlay cognitive radio network. While a relay improves the signal-to-interference- plus-noise ratio, it requires two hops and also generates interference to the primary. Therefore, in underlay cognitive radio, new criteria are needed to determine which relay to select. We present an optimal relay selection rule that maximizes the fading-averaged transmission rate of an average interference-constrained underlay secondary network. It differs from the many rules proposed in the literature. We then analyze its fading-averaged channel capacity. Numerical results show that the proposed rule outperforms direct transmission and several other rules, such as incremental relaying, proposed in the literature.

[1]  Abbas Jamalipour,et al.  Wireless communications , 2005, GLOBECOM '05. IEEE Global Telecommunications Conference, 2005..

[2]  M. Abramowitz,et al.  Handbook of Mathematical Functions With Formulas, Graphs and Mathematical Tables (National Bureau of Standards Applied Mathematics Series No. 55) , 1965 .

[3]  Mohamed-Slim Alouini,et al.  Outage Analysis for Underlay Cognitive Networks Using Incremental Regenerative Relaying , 2013, IEEE Transactions on Vehicular Technology.

[4]  Min Chen,et al.  Centralized Scheme for Joint Relay Selection and Channel Access in Partially-Sensed Cognitive Radio Cooperative Networks , 2011, 2011 IEEE Global Telecommunications Conference - GLOBECOM 2011.

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

[6]  Neelesh B. Mehta,et al.  Power Gain Estimation and Its Impact on Binary Power Control in Underlay Cognitive Radio , 2015, IEEE Wireless Communications Letters.

[7]  Neelesh B. Mehta,et al.  Optimal timer based selection schemes , 2010, IEEE Transactions on Communications.

[8]  Moe Z. Win,et al.  Outage Behavior of Cooperative Diversity with Relay Selection , 2008, IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference.

[9]  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.

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

[11]  B. Gedik,et al.  Two channel estimation methods for amplify-and-forward relay networks , 2008, 2008 Canadian Conference on Electrical and Computer Engineering.

[12]  Kerstin Vogler,et al.  Table Of Integrals Series And Products , 2016 .

[13]  Salama Ikki,et al.  Performance of Multiple-Relay Cooperative Diversity Systems with Best Relay Selection over Rayleigh Fading Channels , 2008, EURASIP J. Adv. Signal Process..

[14]  Neelesh B. Mehta,et al.  Novel Relay Selection Rules for Average Interference-Constrained Cognitive AF Relay Networks , 2015, IEEE Transactions on Wireless Communications.

[15]  Neelesh B. Mehta,et al.  Direct Link-Aware Optimal Relay Selection and a Low Feedback Variant for Underlay CR , 2015, IEEE Transactions on Communications.

[16]  Vo Nguyen Quoc Bao,et al.  Incremental cooperative diversity for wireless networks under opportunistic spectrum access , 2011, The 2011 International Conference on Advanced Technologies for Communications (ATC 2011).

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

[18]  Neelesh B. Mehta,et al.  Accurate Performance Analysis of Single and Opportunistic AF Relay Cooperation with Imperfect Cascaded Channel Estimates , 2013, IEEE Transactions on Communications.

[19]  Keith W. Ross,et al.  Computer networking - a top-down approach featuring the internet , 2000 .

[20]  Milton Abramowitz,et al.  Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables , 1964 .

[21]  Salama Ikki,et al.  Performance Analysis of Cooperative Diversity with Incremental-Best-Relay Technique over Rayleigh Fading Channels , 2011, IEEE Transactions on Communications.

[22]  Zan Li,et al.  Outage Analysis of Underlay Cognitive Multiple Relays Networks with a Direct Link , 2013, IEEE Communications Letters.

[23]  Vahid Tarokh,et al.  The Primary Exclusive Region in Cognitive Networks , 2008, 2008 5th IEEE Consumer Communications and Networking Conference.

[24]  Mohamed-Slim Alouini,et al.  Performance analysis of incremental opportunistic relaying over identically and non-identically distributed cooperative paths , 2009, IEEE Transactions on Wireless Communications.