On the Performance of Optical Wireless Cooperative Systems over the DGG Fading Channel

There is a growing research interests in hybrid optical and microwave wireless communications, which could be adpted in the next generation wireless networks. In this paper, based on the decode-and-forwardrelaying protocol and statistical behavior of the overall link's signal-to-noise-ratio, we consider five different practical scenarios by dering closed-form expressions for the outage and the bit error probabilities. Using Monte Carlo simulation we verify the predicted results. It is demonstrated that, decreasing the semi-angle of LED or increasing the filed of view of VLC receiver enhance the performance

On the performance of multi-antenna AF relaying systems over Nakagami-m fading channels

We analyze the performance of a dual-hop selection combining amplify-and-forward cooperative system over independent and identically distributed Nakagami-m fading channels, where multiple antennas are deployed in the receive side of relays and the destination. The outage probability, symbol error probability and average channel capacity are derived at arbitrary signal to noise ratios (SNRs). In order to obtain additional physical insights, we derive the above mentioned performance metrics in the high SNR regime; this enables us to parameterize the performance of the system in terms of diversity order and coding gain. Furthermore, some special cases of interest (e.g., Nakagami-0.5 and Rayleigh fading channels) are also studied. It is demonstrated that the analytical expressions, expressed via infinite series, match precisely with the Monte-Carlo simulations using only a small number of terms

Multi-relay MIMO systems with OSTBC over Nakagami-m fading channels

We investigate the performance of a dual-hop amplify-and-forward (AF) multi-relay system over independent and identically distributed (i.i.d.) Nakagami-m fading channels, where all nodes in the system are equipped with multiple antennas, and space-time block codes are used in both transmissions. By assuming that the number of source-relay spatial subchannels is equal to the number of relay-destination subchannels, new analytical expressions for the most important figures of merit, namely, outage probability, symbol error probability (SEP), and average channel capacity, are derived for arbitrary signal-to-noise ratios (SNRs) and for arbitrary values of the m parameter. We also present simplified expressions in the high-SNR regime that enable us to quantify the system performance in terms of diversity order and coding gain. Two different scenarios have been considered. First, each relay and destination combine the received signal, and then, the harmonic mean of the source-relay and relay-destination channels is computed. After that, the relay with the best harmonic mean is selected. In the second scenario, each relay and destination combine the received signal, and then, the relay with the best source-relay SNR is selected. After that, the harmonic mean of the source-to-selected-relay channel and selected-relay-to-destination channel is computed. For both considered scenarios, some special cases of interest (e.g., Nakagami-0.5 and Rayleigh) are examined. Our results explicitly demonstrate that the first scheme has higher diversity order than the second scheme, whereas the coding gain of the second scheme is always greater for the multi-relay case

On the performance of multi-antenna AF relaying systems over Nakagami-m fading channels

We analyze the performance of a dual-hop selection combining amplify-and-forward cooperative system over independent and identically distributed Nakagami-m fading channels, where multiple antennas are deployed in the receive side of relays and the destination. The outage probability, symbol error probability and average channel capacity are derived at arbitrary signal to noise ratios (SNRs). In order to obtain additional physical insights, we derive the above mentioned performance metrics in the high SNR regime; this enables us to parameterize the performance of the system in terms of diversity order and coding gain. Furthermore, some special cases of interest (e.g., Nakagami-0.5 and Rayleigh fading channels) are also studied. It is demonstrated that the analytical expressions, expressed via infinite series, match precisely with the Monte-Carlo simulations using only a small number of terms

Two-Way Interference-Limited AF Relaying With Selection-Combining

We investigate the performance of two-way interference-limited amplify-and-forward (AF) relaying systems with selection-combining (SC) over Nakagami-m fading channels. In particular, a tight lower bound on the end-to-end outage probability (OP) is derived in closed-form, while a useful expression is presented for the asymptotically low outage regime. Some special cases of practical interest (e. g., no interference power and Rayleigh fading channels) are also studied. The numerical results provide important physical insights into the implications of model parameters on the system performance

Sum-Rate Based Opportunistic Relay Selection Method For A Dual-Hop Multiple Half/Full-Duplex Bi-directional Wireless Relaying Networks

This paper investigates the opportunistic relay selection method for bi-directional wireless relaying networks. The investigation considers a dual-hop network with a multiple half/ full-duplex two-way relay terminal in the system model. The sum-rate based opportunistic relay selection (SR-ORS) strategy selects the best relay terminal based on maximum sum-rate of user-pair and related relay terminal. According to analytical, asymptotic and Monte-Carlo simulation results, the SR-ORS strategy provides better performance results when the relay terminal operates in full-duplex mode