The exact closed-form expressions for outage probability and bit error rate of spectrum sharing-based multi-hop decodeand-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. Index Terms: Amplify-and-forward, cognitive radio, decode-andforward (DF), ergodic capacity, Rayleigh fading channels, underlay relay networks.
The exact outage probability and BER, and approximate expressions for ergodic capacity of multi-hop underlay DF CRNs in non-identical Rayleigh fading channels are derived in REF .
Spectrum sharing-based multi-hop decode-and-forward relay networks under interference constraints: Performance analysis and relay position optimization
Journal of Communications and Networks
Journal of Communications and Networks
Mathematics Computer Science