In this paper, the secrecy performance and power allocation of the signal-to-noise ratio-based hybrid decode-amplify-forward (HDAF) relaying protocol in wireless cooperative network are investigated to get security at physical layer. The performance metrics considered are secrecy rate and intercept probability. The Ergodic secrecy rate is approximated theoretically. The effect of relay and eavesdropper locations on the secrecy performance of the system is analyzed. It is found that maximum secrecy rate is obtained for the relay close-to-destination case and minimum for the relay close-to-eavesdropper case. Jamming schemes are superior in secrecy rate performance than without jamming schemes. To enhance the secrecy rate further with the optimized relay and jammer powers, invasive weed optimization (IWO) algorithm-based power allocation is proposed. Here, maximizing the secrecy rate is defined as the cost function for the proposed IWO algorithm-based power allocation. Comparative study is done over the conventional equal and proposed power allocation schemes for validation. The proposed power allocation scheme proved to be superior.In recent times, information security [1, 2] improvement at the physical layer is a promising research area. The difference of link capacities between direct (source-to-destination) and eavesdropper links is called as secrecy rate, and in another way, it also represents the rate at which the source sends the information to the destination securely in the company of unauthorized users, that is eavesdroppers. To achieve a non-zero secrecy rate, the signal-to-noise ratio (SNR) at the eavesdropper has to degrade when compared to the destination [3]. The secrecy rate is derived and discussed in basic Gaussian channel [4]. RELATED WORKThe main objective is to improve the capacity of main confidential link by lower the capacity of eavesdropper link. The relays cooperate with the source to transmit data to destination and jammer which provide interference in the form of noise to mislead the eavesdropper to enhance the system's secrecy rate performance. The more preferable relaying protocols are amplify-and-forward (AF) and decode-and-forward (DF). The secrecy rate analysis of relaying schemes is mentioned and compared in [5]. The physical layer security is examined in wireless cooperative networks [6]. The secure communication between a source and destination with multiple relays in a wireless cooperative network in company of multiple malicious nodes is studied in [7]. The relay and jammer selection schemes are proposed in [8] for DF relay-based cooperative network for jamming, non-jamming and hybrid cases. The different types of selection schemes to select relays and jammer for one way decode and forward relay cooperative network consisting of multiple eavesdroppers are proposed in [9]. The recent work related to conventional relaying schemes (AF and DF) for secure communication is mentioned in [10][11][12][13].Maximization of secrecy rate in wireless cooperative network using power allocation...

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