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http://dx.doi.org/10.1109/JCN.2013.000049

Spectrum Sharing-Based Multi-Hop Decode-and-Forward Relay Networks under Interference Constraints: Performance Analysis and Relay Position Optimization  

Bao, Vo Nguyen Quoc (Posts and Telecommunications Institute of Technology (PTIT))
Thanh, Tran Thien (Ho Chi Minh City University of Technology (HCMUT), Vietnam National University Ho Chi Minh City (VNUHCM))
Nguyen, Tuan Duc (International University (IU), Vietnam National University Ho Chi Minh City (VNUHCM))
Vu, Thanh Dinh (Ho Chi Minh City University of Technology (HCMUT), Vietnam National University Ho Chi Minh City (VNUHCM))
Publication Information
Journal of Communications and Networks / v.15, no.3, 2013 , pp. 266-275 More about this Journal
Abstract
The exact closed-form expressions for outage probability and bit error rate of spectrum sharing-based multi-hop decode-and-forward (DF) relay networks in non-identical Rayleigh fading channels are derived. We also provide the approximate closed-form expression for the system ergodic capacity. Utilizing these tractable analytical formulas, we can study the impact of key network parameters on the performance of cognitive multi-hop relay networks under interference constraints. Using a linear network model, we derive an optimum relay position scheme by numerically solving an optimization problem of balancing average signal-to-noise ratio (SNR) of each hop. The numerical results show that the optimal scheme leads to SNR performance gains of more than 1 dB. All the analytical expressions are verified by Monte-Carlo simulations confirming the advantage of multihop DF relaying networks in cognitive environments.
Keywords
Amplify-and-forward; cognitive radio; decode-and-forward (DF); ergodic capacity; Rayleigh fading channels; underlay relay networks;
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