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ERGODIC Capacity analysis of cooperative amplify-and-forward relay networks over rice and nakagami fading channels

ISSN : 0975-3834
Journal from gdlhub / 2017-08-14 11:52:34
Oleh : Bhuvan Modi1, A. Annamalai1, O. Olabiyi1 and R. Chembil Palat2, International Journal of Wireless & Mobile Networks (IJWMN)
Dibuat : 2012-07-02, dengan 1 file

Keyword : cooperative diversity, source-adaptive transmission strategies, ergodic capacity, moment generating function technique, amplify-and-forward relay networks
Subjek : ERGODIC Capacity analysis of cooperative amplify-and-forward relay networks over rice and nakagami fading channels
Url : http://airccse.org/journal/jwmn/0212wmn07.pdf
Sumber pengambilan dokumen : Internet

This article investigates the efficacy of a novel moment generating function (MGF) based analytical


framework for calculating the ergodic channel capacities of cooperative dual-hop amplify-and-forward


(CAF) relay networks under three distinct source-adaptive transmission policies in Rice and Nakagami-


m fading environments. The proposed analytical approach relies on a new exponential-type integral


representation for the logarithmic function 1 2 2


0


ln ( ) ( ) , 0,x xx e e dxγγ γ
∞
− − −= − >∫ that facilitates the task of


averaging it over the probability density function (PDF) of end-to-end signal-to-noise ratio (SNR) in a


myriad of stochastic fading environments. We also resort to a well-known bounding technique to derive


closed-form formulas for the upper and lower bounds for the MGF of dual-hop CAF relayed path SNR in


Rice and Nakagami-m channels (since exact evaluation of the MGF of half-harmonic mean SNR in Rice


fading is known to be very complicated and numerically unstable). These two attributes dramatically


reduces the computational complexity of evaluating the ergodic capacities of CAF multi-relay networks


with the optimal joint power-and-rate adaptation (when the channel side information is available at both


the transmitter and the receiver) and the optimal rate-adaptation with a constant transmit power (when


channel side information is available at the receiver only) policies.

Deskripsi Alternatif :

This article investigates the efficacy of a novel moment generating function (MGF) based analytical


framework for calculating the ergodic channel capacities of cooperative dual-hop amplify-and-forward


(CAF) relay networks under three distinct source-adaptive transmission policies in Rice and Nakagami-


m fading environments. The proposed analytical approach relies on a new exponential-type integral


representation for the logarithmic function 1 2 2


0


ln ( ) ( ) , 0,x xx e e dxγγ γ
∞
− − −= − >∫ that facilitates the task of


averaging it over the probability density function (PDF) of end-to-end signal-to-noise ratio (SNR) in a


myriad of stochastic fading environments. We also resort to a well-known bounding technique to derive


closed-form formulas for the upper and lower bounds for the MGF of dual-hop CAF relayed path SNR in


Rice and Nakagami-m channels (since exact evaluation of the MGF of half-harmonic mean SNR in Rice


fading is known to be very complicated and numerically unstable). These two attributes dramatically


reduces the computational complexity of evaluating the ergodic capacities of CAF multi-relay networks


with the optimal joint power-and-rate adaptation (when the channel side information is available at both


the transmitter and the receiver) and the optimal rate-adaptation with a constant transmit power (when


channel side information is available at the receiver only) policies.

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