## 2 Related Work  
Some important works on relay selection include [PERSON] et al. [7; 8], where the authors present a simple approach to select the best possible candidate to support the source node in forwarding its information with the help of the measurement of the instantaneous channel conditions. [PERSON] et al. [9] have proposed a threshold selection based relaying scheme for a cooperative decode and forward system. [PERSON] [10] has presented an optimized user selection approach for amplifying and forward relaying method. The performance of cooperative diversity systems can be further enhanced through proper resource selection. In this regards, [PERSON] and [PERSON] have derived a closed form of expression for the outage probability for a transmit antenna selection MIMO system under a \(K-\mu\) fading channel [11]. Practical application of the cooperative relaying technique in a cellular network is discussed by [PERSON] and [PERSON]. Authors have evaluated the performance of proactive and reactive relay selection in cooperative relaying techniques over a dynamic Nakagami-m fading channel in the presence of inter channel interference for a cellular network for an adaptive transmission scenario and calculated the simulation results based on the average system capacity and outage probability for various cases of fading [12]. In another work, [PERSON] et al. [13] presented a generalized framework for a DF relaying scheme and derived a closed-form expression for outage probability and symbol error rate for repetitive transmission technique and relay selection technique for different modulation schemes under a Nakagami-m fading channel. The authors have shown that relay selection based techniques are useful only when the channel state information for relay node is perfect. [PERSON] has analyzed the performance of a decode and forward relaying scheme for transmit antenna selection. The authors have also analyzed the outage probability of a system for a Nakagami fading environment [14]. To improve the performance of a multi-user cooperative AF system, a user-relay assignment based antenna selection scheme is presented by [PERSON] et al. [15]. The proposed scheme uses best relay selection in conjunction with an antenna selection to improve the throughput performance of the system. The application of a cooperative relay selection to overcome the problem of data transmission in a power line communication (PLC) system is presented by [PERSON] and [PERSON] [16]. The authors have proposed a two-hop communication scenario to overcome the transmission losses in a PLC system. In other work, the application of a relay selection scheme is used to improve the secrecy outage probability in half-duplex cognitive radio networks [17]. The authors have proposed a K-best relay selection scheme for optimal relay selection and partial relay selection and derived a closed form of expression for secrecy outage probability in the case of multiple eavesdroppers and multiple primary users. [PERSON] et al. have analyzed the performance of dual hop-DF relaying scheme with pure and rate-selective relay selection over a Nakagami fading environment. It is assumed that the direct link between source-to-destination is active and relay selection is done only when the direct link is weak. The authors have also derived closed-form expression for outage probability and average symbol error probability (ASEP) using MGF (moment gathering function) and CDF (cumulative distribution function) [18]. In another seminal work, [PERSON] analyzed the performance of a dual-hop DF relaying scheme over an arbitrary Nakagami fading channel and derived the closed-form expression for (ASEP) using MGF [19]. [PERSON] et al. [20] presented the application of a cooperative relay selection scheme to improve the data rate and throughput performance of a LTE system. The proposed relay selection scheme uses error rate performance as a selection criterion.