Optimized Relay Selection and Power Allocation by an Exclusive Method in Multi-Relay AF Cooperative Networks

Bao, Jianrong; Jiang, Bin; Liu, Chao; Jiang, Xianyang; Sun, Minhong

doi:10.3837/tiis.2017.07.012

Cited by 2 publications

(3 citation statements)

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“…In recent years, there are a lot of researches about cooperative communications to improve diversity capacity, and hence to increase the coverage and rate of wireless networks [7][8][9][10]. In the first timeslot, the sources broadcast their data to the relays while in the second timeslot, the relays assist the sources to transfer the received signals to the destinations by solutions as amplify-and-forward (AF) and decode-and-forward (DF) relaying techniques [11][12][13][14]. The opeartion of the DF technique is to decode data from received signals and forward re-coded data to the intended destinations whereas the relays in the AF technique only amplify the received data-carried signals and forward all to the destinations.…”

Section: Introductionmentioning

confidence: 99%

Exact Outage Probability of Two-Way Decode-and-Forward NOMA Scheme with Opportunistic Relay Selection

Huynh¹,

Vozňák²

2019

KSII TIIS

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In this paper, we propose a two-way relaying scheme using non-orthogonal multiple access (NOMA) technology. In this scheme, two sources transmit packets with each other under the assistance of the decode-and-forward (DF) relays, called as a TWDFNOMA protocol. The cooperative relays exploit successive interference cancellation (SIC) technique to decode sequentially the data packets from received summation signals, and then use the digital network coding (DNC) technique to encrypt received data from two sources. A max-min criterion of end-to-end signal-to-interference-plus-noise ratios (SINRs) is used to select a best relay in the proposed TWDFNOMA protocol. Outage probabilities are analyzed to achieve exact closed-form expressions and then, the system performance of the proposed TWDFNOMA protocol is evaluated by these probabilities. Simulation and analysis results discover that the system performance of the proposed TWDFNOMA protocol is improved when compared with a conventional three-timeslot two-way relaying scheme using DNC (denoted as a TWDNC protocol), a four-timeslot two-way relaying scheme without using DNC (denoted as a TWNDNC protocol) and a two-timeslot two-way relaying scheme with amplify-and-forward operations (denoted as a TWANC protocol). Particularly, the proposed TWDFNOMA protocol achieves best performances at two optimal locations of the best relay whereas the midpoint one is the optimal location of the TWDNC and TWNDNC protocols. Finally, the probability analyses are justified by executing Monte Carlo simulations.

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Section: Introductionmentioning

confidence: 99%

Exact Outage Probability of Two-Way Decode-and-Forward NOMA Scheme with Opportunistic Relay Selection

Huynh¹,

Vozňák²

2019

KSII TIIS

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“…Numerous researches have been addressed for different kinds of wireless relay technology, such as amplify-and-forward (AF), decode-and-forward (DF) and compress-and-forward (CF). For AF system, the relays are utilized to amplify and forward signal, whereas the noise is also amplified [1]- [5]. For DF system, the relays firstly demodulate and decode the received signal, and then re-encode and transmit it to the destination.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, wireless relay technology has also been studied from other aspects, such as outage probability [11] [12], relay selection [13]- [15], minimizing the bit error ratio (BER) [16] [17] and spatial channel pairing strategy [18]. It should be noted that power allocation has long been playing an important role in wireless relay technology [3] [5], [19]- [22], since a better system performance can be achieved by appropriately allocating limited power between the source and relays.…”

Section: Introductionmentioning

confidence: 99%

Design and Optimization for Distributed Compress-and-Forward System based on Multi-Relay Network

Bao¹,

Xu²,

Luo³

et al. 2019

KSII TIIS

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A novel distributed compress-and-forward (CF) system based on multi-relay network is presented. In this system, as the direct link between the source and destination is invalid due to some reasons, such as the limited power, special working environment, or even economic factors, relays are employed to receive analog signals and carry on distributed compressed encoding. Subsequently, the digital signals are transmitted to the destination via wireless channel. Moreover, a theoretical analysis for the system is provided by utilizing the Chief Executive Officer (CEO) theory and Shannon channel capacity theory, and the rate-distortion function as well as the connection between the transmission rate and the channel capacity are constructed. In addition, an optimal signal-to-noise ratio (SNR)-based power allocation method is proposed to maximize the quantization SNR under the limited total power. Simulation result shows that the proposed CF system outperforms the amplify-and-forward (AF) system versus the SNR performance.

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Optimized Relay Selection and Power Allocation by an Exclusive Method in Multi-Relay AF Cooperative Networks

Cited by 2 publications

References 0 publications

Exact Outage Probability of Two-Way Decode-and-Forward NOMA Scheme with Opportunistic Relay Selection

Exact Outage Probability of Two-Way Decode-and-Forward NOMA Scheme with Opportunistic Relay Selection

Design and Optimization for Distributed Compress-and-Forward System based on Multi-Relay Network

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