Abstract
In this paper, we analyze the performance of cooperative diversity using adaptive Decode and Forward (DF) relaying over independent but non-necessarily identical flat composite fading channels which include multipath fading and shadowing simultaneously. We have considered the transmission of M-QAM modulated signals over Generalized-K channel model which is very versatile and accurately approximates many of the commonly used channel models as Nakagami-m, Log-Normal distributions and the mixture of the two distributions for the composite fading. Using an approximation of the Generalized-K pdf by a Gamma pdf, we derive analytical expressions for the outage probability and the Average Symbol Error Probability (ASEP) of the proposed scenario and analyze their dependence on the channel parameters. We assume in our context that the relay decides independently whether or not to forward the signal to the destination based on the received signal quality. Simulations are provided for 16-QAM modulation for both the outage and the ASEP. The obtained results are discussed and proved to be in good agreement with our theoretical analysis.
Highlights
Multiple-Input Multiple-Output (MIMO) communication schemes have been widely studied to achieve diversity advantages, increased data rate, and interference suppression
We analyze the performance of cooperative diversity using adaptive Decode and Forward (DF) relaying over independent but non-necessarily identical flat composite fading channels which include multipath fading and shadowing simultaneously
We have considered the transmission of M-QAM modulated signals over Generalized-K channel model which is very versatile and accurately approximates many of the commonly used channel models as Nakagami-m, Log-Normal distributions and the mixture of the two distributions for the composite fading
Summary
Multiple-Input Multiple-Output (MIMO) communication schemes have been widely studied to achieve diversity advantages, increased data rate, and interference suppression. It has been shown that cooperative diversity or user cooperation offers spatial diversity when multiple users cooperate to build a virtual antenna array [1,2], benefiting on MIMO advantages Such a system aims to increase the channel capacity and to improve the link reliability of the wireless communications [2]. In [10], the authors have derived the outage probability, the average channel capacity and the ASEP for different modulated signals over the Generalized-K distribution. We have evaluated the outage probability [19], and the ASEP for M-QAM modulated signals [20], of a DF relaying technique over a Generalized-K channel.
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