Computing Amplify-and-Forward Relay Amplification Factor to Improve Total Capacity at Destination

Abstract

In this study, we propose a new Amplify-and-Forward (AF) amplification factor to improve the error performances of the current AF schemes and thus enhance the total capacity at the destination terminal. The proposed scheme has two degrees of freedom, meaning that it contains two variable parameters that can simultaneously vary the amplification factor instead of one as in traditional variable-gain or semi-blind relaying. The numerical results show that the proposed AF scheme outperforms some current ones with which it is compared in terms of average capacity and probability of outage and thus brings AF relaying performances closer to that of Decode-and Forward (DF) strategy which hitherto outperforms it. The results also show that by increasing or decreasing the power share of the relay, the optimal location of the relay is not only moved closer to or farther away from the destination, the total average capacity at that location is also correspondingly increased or decreased.

Stochastic geometry modelling and analysis for cooperative NOMA with large transmit antennas for 5G applications and beyond

“…And 𝛽 i is the path-loss between the relay and i-th user. Here, G is the amplifying factor [41] given by…”

Reliability-Aware Cooperative Routing with Adaptive Amplification for Underwater Acoustic Wireless Sensor Networks

“…In cooperative routing, data packets are broadcasted by a source node S and are received by a relay node R and a destination node D. At least a single relay node R between S and D also receives the broadcasted information. Such information is then transferred from R to D that combines the two copies of information to extract the desired information [20].…”

“…A data symbol x broadcasted by S is received by D as [20] y SD = h SD x + n SD (6) where y SD is the signal received at D, h SD is the gain of the channel from S to D and n SD represents the additive white Gaussian noise (AWGN) along the S − D link. The source broadcasted data symbol x, when received by R, is given as [20]…”

“…where y SR is the signal received at R, h SR is the gain of the channel from S to R and n SR is the AWGN along the S − R link. Adaptive amplification implies that at R, the received signal is amplified before transferring it to D when the error probability is above 50% (a certain threshold) and is given by [20]…”

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