Suboptimal Power Allocation for a Two-Path Successive Relay System with Full Interference Cancellation

Chu, Chang-Chen; Wang, Hung-Chin; Wang, Chin-Liang

doi:10.1109/vetecs.2012.6240057

Cited by 7 publications

(5 citation statements)

References 9 publications

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“…Recent works in [16], [17] considered the IRI cancellation proposed in [14] in the two-path relay scheme and tried to further improve the performance by adopting power allocation or relay selection. Chu et al [16] proposed a power allocation method in order to minimize the symbol error rate with partial channel state information (CSI) at the source.…”

Section: A Related Workmentioning

confidence: 99%

“…Chu et al [16] proposed a power allocation method in order to minimize the symbol error rate with partial channel state information (CSI) at the source. In [16], the authors assumed that the source uses the same transmit power to both the relays, and both the relays transmit with the same power to the destination. However, this approach may not be optimal in a typical/practical environment where the channel power gains of different links are often different.…”

Section: A Related Workmentioning

confidence: 99%

“…While individual power constraint represents the typical situation in practice, global power constraint can be used as a reference on the transmission power required per source-destination link for performance comparison of the two-path relay and direct point-to-point networks [18], [19]. Note that only global power constraint is considered in [16], [17].…”

Section: B Contributionsmentioning

confidence: 99%

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Rate Maximization Based Power Allocation and Relay Selection With IRI Consideration for Two-Path AF Relaying

Kim

Chaitanya

Le‐Ngoc

et al. 2015

IEEE Trans. Wireless Commun.

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We consider the power allocation and relay selection for rate maximization in a two-path amplify-and-forward (AF) relay network with inter-relay interference (IRI) consideration. We first investigate the power allocation with only a pair of relays under both the individual and global power constraints. To find the global optimum solution to this nonconvex problem, we develop a three-step approach using the rate-profiling technique together with a reformulation of the sum-rate maximization problem as a set of power-minimization geometric programming problems (GPPs). For reduced complexity, we further convert the optimization problem into a set of GPPs in a single-step by using a high signal-to-interference-plus-noise ratio approximation. Next, we consider the relay pair selection and propose an algorithm in which the achievable rate of each pair of relays with the proposed power allocation is compared. This selection criterion outperforms the conventional selection scheme in terms of the achievable rate. We further propose two low-complexity selection criteria for low and moderate IRI. For moderate IRI, the ratio of the source-relay and relay-destination channel power product to the square of inter-relay channel power can be used for relay selection to achieve a performance close to that of the selection based on the proposed power allocation.Index Terms-Two-path relay scheme, amplify-and-forward, half-duplex relaying, power allocation, relay selection. 1536-1276 (c)

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Section: A Related Workmentioning

confidence: 99%

Section: A Related Workmentioning

confidence: 99%

Section: B Contributionsmentioning

confidence: 99%

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Rate Maximization Based Power Allocation and Relay Selection With IRI Consideration for Two-Path AF Relaying

Kim

Chaitanya

Le‐Ngoc

et al. 2015

IEEE Trans. Wireless Commun.

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“…, together withx (n) r stored at TS n, another XOR operation is performed through (13). In order to recover x (n) i , g(1, 1) = g(−1, −1) = −1 and g(1, −1) = g(1, −1) = 1 are supposed to be satisfied.…”

Section: A Bpsk Modulationmentioning

confidence: 99%

“…The orthogonality of the real part and the imaginary part of the symbol was utilized to distinguish the information and interference in [12]. More research on two-path relay in recent years can be found in [13] [14].…”

Section: Introductionmentioning

confidence: 99%

High-Throughput Cooperative Communication with Interference Cancellation for Two-Path Relay in Multi-Source System

Lü

Hong

Xue

2013

IEEE Trans. Wireless Commun.

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Relay-based cooperative communication has become a research focus in recent years because it can achieve diversity gain in wireless networks. In existing works, network coding and two-path relay are adopted to deal with the increase of network size and the half-duplex nature of relay, respectively. To further improve bandwidth efficiency, we propose a novel cooperative transmission scheme which combines network coding and two-path relay together in a multi-source system. Due to the utilization of two-path relay, our proposed scheme achieves full-rate transmission. Adopting complex field network coding (CFNC) at both sources and relays ensures that symbols from different sources are allowed to be broadcast in the same time slot. We also adopt physical-layer network coding (PNC) at relay nodes to deal with the inter-relay interference caused by the twopath relay. With careful process design, the ideal throughput of our scheme achieves by 1 symbol per source per time slot (sym/S/TS). Furthermore, the theoretical analysis provides a method to estimate the symbol error probability (SEP) and throughput in additive complex white Gaussian noise (AWGN) and Rayleigh fading channels. The simulation results verify the improvement achieved by the proposed scheme.Index Terms-complex field network coding; two-path relay; inter-relay interference; physical-layer network coding; throughput.Although CFNC allows simultaneous transmissions from all sources, 2L TSs are required to complete the transmission of L symbols for each source due to the half-duplex nature of relay. On the other hand, existing researches on two-path relay only consider single-source models. With the increase of network size, the single-source models in [10]-[14] cannot be directly generalized to multi-source systems with simultaneous transmissions at sources. Therefore, in order to further improve bandwidth efficiency, we propose a novel transmission scheme based on two-path relay in multi-source wireless networks. Our scheme combines network coding and two-path relay together in a (multisource,2-relay,1-destination) system. To allow simultaneous transmissions of all sources, CFNC is operated before transmission. With the help of two-path relay, full-rate transmission of multi-source system is achieved. We use physical-layer network coding at relay nodes to deal with the IRI caused by two-path relay and the interference is successfully canceled at destination. Only L + 1 TSs are needed to send L symbols for each source. Compared with CFNC, our proposed cooperative transmission in (N S , 2, 1) system achieves ideal throughput as high as 1 sym/S/TS, twice as high as that of CFNC in [3]. Compared with [10]- [14], multi-source model, rather than single-source, is introduced to two-path relay system without requirements for additional TSs and resource blocks. Besides, theoretical analysis and simulation results also demonstrate the improvement of our scheme's performance.The rest of this paper is organized as follows: Section II depicts the system model. Section I...

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Partial Inter-Relay Interference Cancellation in Two Path Successive Relay Network

Han

Wang

et al. 2014

IEEE Commun. Lett.

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Suboptimal Power Allocation for a Two-Path Successive Relay System with Full Interference Cancellation

Cited by 7 publications

References 9 publications

Rate Maximization Based Power Allocation and Relay Selection With IRI Consideration for Two-Path AF Relaying

Rate Maximization Based Power Allocation and Relay Selection With IRI Consideration for Two-Path AF Relaying

High-Throughput Cooperative Communication with Interference Cancellation for Two-Path Relay in Multi-Source System

Partial Inter-Relay Interference Cancellation in Two Path Successive Relay Network

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