Optimal Source and Relay Design for Multiuser MIMO AF Relay Communication Systems With Direct Links and Imperfect Channel Information

He, Zhiqiang; Zhang, Xiaonan; Bi, Yunqiang; Jiang, Wan; Rong, Yue

doi:10.1109/twc.2015.2497683

Cited by 16 publications

(17 citation statements)

References 18 publications

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“…In DT, there are two source nodes S 1 and S 2 . In RT, there is also a relay node R except for two source Table 1 Existing literature comparison with this paper Optimal transmit power (OTP) [15][16], [19][20][21][22][23], [25][26][27][28], this paper…”

Section: System Modelmentioning

confidence: 99%

“…Power amplifier (PA) efficiency [15], [20][21][22][23], [26][27][28], this paper Direct links (DLs) [18], [24][25][26][27][28], this paper…”

Section: System Modelmentioning

confidence: 99%

“…The noise at the node S 1 is n 1 , the noise at the node S 2 is n 2 , and the noise at the node R is n r . Meanwhile, the DLs between two source nodes S 1 and S 2 in RT are existed and they can be exploited to convey information [25]. The noises are zero-mean symmetric complex Gaussian vector with variance 1.…”

Section: System Modelmentioning

confidence: 99%

“…Actually, consideration of DLs that are existed in RT can achieve further SE performance gain, and some works have been done on it. For example, cellular communication scenario involving the coexistence of one-hop DT and two-hop relaying has been studied in [24], optimal source and relay design for multiuser MIMO AF relay communication system with DLs and imperfect channel state information (CSI) has been investigated in [25], EE optimization for a twohop AF relay network with DLs over Rayleigh fading channels has been considered in [26], RT considering DLs and aiming at maximizing EE has been discussed in [27], and the optimization for energy-efficient FD transmissions with DLs has been studied in our recent work [28]. As for the comparisons between the half-duplex and FD technique of the related works, they have been given in [28].…”

Section: Introductionmentioning

confidence: 99%

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Energy-efficiency maximization bidirectional direct and relay transmission

Cai

Qiu

Jiang

et al. 2020

J Wireless Com Network

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Energy-efficient transmission (EET) has become a very important problem in wireless communication. Optimal power allocation (OPA) is one of the general methods to achieve EET. But when OPA is only considered in EET, it maybe cannot analyze EET problems accurately. This paper aims at analyzing energy-efficient bidirectional direct and relay transmission (RT) through joint optimization of transmit power (TP) and transmit time (TT) allocation. In RT, direct links (DLs) are existed. The EET problems are given with three optimization cases: (i) maximizing sum throughput (ST) to maximize energy efficiency (EE), in such case, optimal TT (OTT), optimal relay position (ORP), and outage probability analysis are given; (ii) minimizing total energy consumption (TEC) to maximize EE, in such case, optimal TP (OTP), OTT with gradient-descent algorithm, and influences of asymmetry and asymmetry transmission tasks are given; and (iii) maximizing ST and minimizing TEC simultaneously to maximize EE, in such case, Dinkelbach's algorithm and one-by-one optimal algorithm are given. Simulation results are presented to validate theoretical analysis. Results reveal that relay technique and DLs in RT can improve system's EE.

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Section: System Modelmentioning

confidence: 99%

“…Power amplifier (PA) efficiency [15], [20][21][22][23], [26][27][28], this paper Direct links (DLs) [18], [24][25][26][27][28], this paper…”

Section: System Modelmentioning

confidence: 99%

Section: System Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Energy-efficiency maximization bidirectional direct and relay transmission

Cai

Qiu

Jiang

et al. 2020

J Wireless Com Network

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“…He et al present statistically robust design for multiuser MIMO relay systems with direct source‐destination links and Imperfect Channel State Information (CSI). The Minimum Mean‐Squared Error (MMSE) of the signal waveform estimation at the destination node is amended as the design criterion.…”

Section: Literature Reviewmentioning

confidence: 99%

A novel enhanced bat optimization based energy efficiency and imperfect channel state information in cooperative MIMO‐AF systems

Kanithan¹,

Tamilselvan²

2018

Concurrency and Computation

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Summary Energy Efficiency (EE) is a vital design standard for the future generation of communication systems. Similarly, cooperative communication is extremely efficient for improving the performance of such systems. Current research presents a relay precoding optimization algorithm in order to resolve EE problem in the Multiple‐Input‐Multiple‐Output (MIMO) Amplify‐And‐Forward (AF) Relay Networks containing correct Channel State Information (CSI) only. With the intension of focus on imperfect, this work presents a novel design of MIMO AF Relay Networks under Imperfect CSI (ICSI) by taking Channel Estimation (CE) errors and feedback delay errors, deprived of taking the straight link from source to destination. For this reason, we present a Hidden Semi Markov Model (HSMM) under ICSI, in which the source and destination based relay links are identified through destination. After that, we implement an Enhanced Bat Optimization (EBO) algorithm to enhance the EE of MIMO relay‐based non‐regenerative cooperative communication systems by means of improving the source and relay precoders by taking relay and direct links into consideration. Simulation outcomes prove that the EE‐ EBO optimization is capable of enhancing the outcomes of MIMO‐AF systems while matched up with direct/relay link with EE precoding optimization and precoding optimization algorithms.

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