Low-Complexity End-to-End Performance Optimization in MIMO Full-Duplex Relay Systems

Suraweera, Himal A.; Krikidis, Ioannis; Zheng, Gan; Yuen, Chau; Smith, Peter J.

doi:10.1109/twc.2013.122313.130608

Cited by 257 publications

(209 citation statements)

References 35 publications

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“…In this section, closed-form expression for the outage probability of the overall SINR upper-bound (lower-bound outage probability expression for the exact overall SINR) is derived. The outage probability of the overall SINR upper-bound is given as (21) and…”

Section: A Outage Probability Analysismentioning

confidence: 99%

The Performance of Wireless Powered MIMO Relaying With Energy Beamforming

Almradi

Hamdi

2016

IEEE Trans. Commun.

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Abstract-This paper analyzes the performance of energyconstrained dual-hop amplify-and-forward (AF) relaying systems with multi-antenna nodes, in the presence of multiple co-channel interferers (CCI) at the destination. To maximize the overall signal-to-interference-plus-noise ratio (SINR) as well as the harvested energy so as to mitigate the severe effects of fading and enable long-distance wireless power transfer, hop-by-hop information and energy beamforming is proposed where the transmitted signal is steered along the strongest eigenmode of each hop. The wirelessly powered relay scavenge energy from the source information radio-frequency (RF) signal through energy beamforming, where both the time-switching receiver (TSR) and power-splitting receiver (PSR) are considered, then uses the harvested energy to forward the source message to the destination. To this end, tight lower and upper bound expressions for the outage probability and ergodic capacity are presented in closed-form. These are employed to investigate the throughput of the delay-constrained and delay-tolerant transmission modes. In addition, the asymptotic high signal-to-noise ratio (SNR) outage probability and ergodic capacity approximations are derived, where the achievable diversity order is also presented. Numerical results sustained by Monte Carlo simulations show the tightness of the proposed analytical expressions. The impact of various parameters such as energy harvesting time, power-splitting ratio, source transmit power and the number of antennas on the system throughput is also considered.Index Terms-MIMO relaying, half-duplex relaying, beamforming, maximum ratio transmission (MRT), maximum ratio combining (MRC), zero-forcing (ZF), wireless power transfer, energy harvesting, outage probability, ergodic capacity.

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Section: A Outage Probability Analysismentioning

confidence: 99%

The Performance of Wireless Powered MIMO Relaying With Energy Beamforming

Almradi

Hamdi

2016

IEEE Trans. Commun.

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“…Lately, full-duplex (FD) relaying received upsurge of research interest due to its capability to increase spectral efficiency (see e.g., [1]- [8]), which is solely because of the fact that full-duplex nodes receive and re-transmit the information symbol over the same time and frequency, consequently, efficiently employing the spectrum resources of the network. However, the main hurdle of FD terminals is the loopback self-interference (LI) brought about by the signal infiltration from the terminal's transmission to its own reception, specifically, the huge power differences between the one transmitted from the FD terminal and its received signal (the received signal is extremely weaker than that of the transmitted one due to the heavy path loss and fading), which surpass the dynamic range of the analoge-to-digital converter.…”

Section: Introductionmentioning

confidence: 99%

“…Synergistic conjunction of multiple-input-multiple-output (MIMO) techniques with FD relaying systems delivers a new dimension of LI suppression in the spatial domain, and also can provide higher capacity in contrast to its HD relaying rival (see e.g., [7], [8], [10], [13]). Hence, when a FD relaying networks with multi-antenna terminals is present, joint optimization of precoding and decoding at the transmitter and receiver, respectively, can be utilized to diminish the LI impact at the relay.…”

Section: Introductionmentioning

confidence: 99%

Hop-by-Hop ZF Beamforming for MIMO Full-Duplex Relaying With Co-Channel Interference

Almradi

Xiao

Hamdi

2018

IEEE Trans. Commun.

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Abstract-In this paper, a comprehensive design and analysis of multiple-input multiple-output (MIMO) full-duplex (FD) relaying systems in a multi-cell environment are investigated, where a multi-antenna amplify-and-forward (AF) FD relay station serves multiple half-duplex (HD) multi-antenna users. The pivotal obstacles of loopback self-interference (LI) and multiple co-channel interferers (CCI) at the relay and destination when employing FD relaying in cellular networks are addressed. In contrast to the HD relaying mode, the CCI in the FD relaying mode is predicted to double since the uplink and downlink communications are simultaneously scheduled via the same channel. In this paper, the optimal layout of transmit (receive) precoding (decoding) weight vectors which maximizes the overall signal-to-interefernce-plusnoise ratio (SINR) is constructed by a suitable optimization problem, then a closed-form sub-optimal formula based on null space projection is presented. The proposed hop-by-hop rank-1 zero-forcing (ZF) beamforming vectors are based on added ZF constraints used to suppress the LI and CCI channels at the relay and destination, i.e., the source and relay perform transmit ZF beamforming, while the relay and destination employ receive ZF combining. To this end, unified accurate expressions for the outage probability and ergodic capacity are derived in closed-form. In addition, simpler tight lower-bound formulas for the outage probability and ergodic capacity are presented. Moreover, the asymptotic approximations for outage probability is considered to gain insights into system behavior in terms of the diversity order and array gain. Numerical and simulation results show the accuracy of the presented exact analytical expressions and the tightness of the lower-bound expressions. The case of hopby-hop maximum-ratio transmission/maximal-ratio combining beamforming is included for comparison purposes. Furthermore, our results show that while multi-antenna terminals improve the system performance, the detrimental effect of CCI on FD relaying is clearly seen. Therefore, our findings unveil that MIMO FD relaying could significantly improve the system performance compared to its conventional MIMO HD relaying counterpart.Index Terms-MIMO relaying, full-duplex relaying, halfduplex relaying, beamforming, zero-forcing (ZF), outage probability, ergodic capacity, co-channel interference.

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“…A group of recent papers such as [23,24] and [25][26][27][28][29][30][31][32][33] address full-duplex relays. But none of them addresses multicarrier fullduplex decode-forward relay with direct link even though it is well known that a decode-forward relay generally yields a higher capacity than an amplify-forward relay [9] .…”

Section: Introductionmentioning

confidence: 99%

Optimal power allocation for a full-duplex multicarrier decode-forward relay system with or without direct link

2017

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a b s t r a c tThis paper addresses power allocation problems for a dual-hop full-duplex multicarrier decode-forward relay system with or without a direct link from the source to the destination. The full-duplex relay has a residual self-interference proportional to its transmitted power. We consider two schemes of decodeforward at the relay: carrier-wise decode-forward (CDF) and group-wise decode-forward (GDF). For the CDF scheme, we consider problems of optimal power allocation subject to system-wise total power constraint, node-wise individual power constraint and system-wise rate constraint, respectively. All these problems are shown to be equivalent to convex problems, and fast algorithms for finding the exact solutions are developed. For the GDF scheme, we focus on the case of node-wise individual power constraint. This problem is non-convex for which we develop fast algorithms for finding locally optimal solutions. Using the algorithms developed in this paper, we are able to show that the system capacity with optimal power allocation based on either CDF or GDF is higher than that of the half-duplex relay (HDR) system at power levels where HDR outperforms the direct transmission via the direct link. Furthermore, the system capacity based on GDF is consistently higher than that of HDR for all power levels while both have the same degree of freedom. This paper also shows new insights of algorithmic development, which should be useful for other related problems.

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Low-Complexity End-to-End Performance Optimization in MIMO Full-Duplex Relay Systems

Cited by 257 publications

References 35 publications

The Performance of Wireless Powered MIMO Relaying With Energy Beamforming

The Performance of Wireless Powered MIMO Relaying With Energy Beamforming

Hop-by-Hop ZF Beamforming for MIMO Full-Duplex Relaying With Co-Channel Interference

Optimal power allocation for a full-duplex multicarrier decode-forward relay system with or without direct link

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