Joint Optimization of Power Allocation and Relay Location for Decode-and-Forward Dual-Hop Systems over Nakagami-m Fading Channels

Abstract

We consider power allocation (PA) and relay positioning in a dual-hop decode-and-forward relaying system over Nakagami-m fading channels. We investigate adaptive power allocation (PA) with fixed relay location, optimal relay location with fixed power allocation and joint optimization of the PA and relay location under transmit power constraint in order to minimize outage probability and average error probability upper bound. Results show that the analyzed adaptive algorithms outperform uniform algorithms and direct transmission. It is also found that as the source destination channel is getting better, the less power will be needed to allocate to the relay node in order to satisfy the optimization criteria. Numerical results are presented to verify our analysis 1 .

Optimal power allocation and relay location for decode-and-forward dual-hop systems over Weibull fading channels

“…It also exhibits an excellent fit to experimental fading channel measurements for both indoor and outdoor environments [9] [10]. Considering related work on PA or optimal relay location in Weibull fading, the authors in [11] have extend the work in [7] to amplifyand-forward dual-hop networks over Weibull fading channels. However, the case of decode-and-forward (DF) relaying over Weibull fading channels is not considered before and the work in [11] aims to minimize the outage probability or the average error probability upper bound.…”

“…In [6], the authors have studied the optimal relay location to maximize the relay-enhanced cell coverage or system ergodic capacity in Rayleigh fading channels. The optimization problems, such as PA with fixed relay location, optimal relay location with fixed power allocation and joint optimization of the PA and relay location in order to minimize the outage probability and the average error probability upper bound, are discussed over Nakagami-m fading channel in [7].…”

Joint optimization of power allocation and relay position for regenerative relaying in the presence of co-channel interference

“…In [1], the optimal transmit power allocation at the source node and the relays was addressed in order to minimize the outage probability in dual-hop and multi-hop relaying systems for Rayleigh fading channels and then extended to Nakagamim and Weibull fading in [4] and [5]. In [6], the optimum power allocation for parallel regenerative two-relayed transmission in order to minimize the bit error probability of the system under power constraints and multi-level quadrature amplitude modulation (M-QAM) was derived.…”

Joint power and location optimization for analog network coding with multi-antenna sources

“…The case of relay power optimization with no power control at the sources was studied under Nakagami-m fading in [8]- [10]. For one-way decode-and-forward scheme, the problem of joint optimization of power (at source and relay nodes) and relay location over Nakagami-m fading channels was investigated in [11]. However, to the best of our knowledge, the problem of joint optimization of power allocation and relay location for ANC has not been discussed so far, even for the popular Rayleigh links.…”