Optimization of relay placement and power allocation for decode-and-forward cooperative relaying over correlated shadowed fading channels

Abstract

In this paper, we investigate the relay placement and power allocation for decode-and-forward (DF) cooperative relaying over correlated lognormal shadowed Rayleigh fading channels. Assuming that maximum-ratio combining is performed at the destination, we first derive an upper bound of symbol error rate (SER) with M-phase-shift keying (PSK) modulation. Then, three optimization problems are formulated to minimize the obtained SER upper bound, namely optimal relay placement with fixed power allocation, optimal power allocation with fixed relay location, and joint optimization of relay placement and power allocation. It is shown by the analytical results that the correlation coefficients and the standard deviations of shadowing have significant impacts on the optimal relay placement and power allocation. The simulation results validate our analysis and show that the SER upper bound is asymptotically tight in the high signal-to-noise ratio (SNR) regime.

A binary artificial bee colony algorithm for constructing spanning trees in vehicular ad hoc networks

“…Cornejo et al studied a reliable neighbor discovery layer for MANETs, which could be applied in regular square region or hexagonal tiling region [13]. Han et al investigated the relay placement and power allocation for cooperative relaying [14]. Lachowski et al implemented distributed algorithms for building routing spanning trees in wireless sensor networks [15].…”

On the Performance of SR and FR Protocols for OSTBC-Based AF-MIMO Relay System With Channel and Noise Correlations

“…ZMCSCG random variables. Substituting H m from (25) into α m yields α m = 8 The derivation of the exact expression in the FR protocol turns to be mathematically intractable, and, as in the SR protocol, it is very much likely that such exact expression does not provide insights into diversity and CGs. 9 The proposed performance analysis also holds true when mutual coupling matrices [22] are lumped to spatial channel correlation matrices.…”

“…This is due to the fact that we need to deal with the product of the functions of two random processes. The related complexity is also evident from[25] which limits the analysis to a single-antenna decode-andforward relay system for obtaining the upper bound of the system symbol error rate.…”

Outage Performance Analysis of Underlay Cognitive Radio Networks with Decode‐and‐Forward Relaying

“…Most of the previous publications have studied the performance of cooperative communications techniques over different fading channels and under different constraints [18][19][20][21][22][23][24][25][26]. In [18], the authors derive the analytical error rate expressions to develop power allocation, relay selection and placements with generic noise and interference in a cooperative diversity system employing AF relaying under Rayleigh fading.…”

“…Furthermore, Refs. [21][22][23][24][25][26] investigate the relay node placements minimizing the outage probability where the performance improvement is quantified. Although cooperative transmissions have greatly been considered in the above manuscripts, to the best of the our knowledge, there has not been any notable research for the relay-assisted CR networks based on the DE optimization algorithm.…”