The Degrees of Freedom of Full-Duplex Bidirectional Interference Networks With and Without a MIMO Relay

Cheng, Zhiyu; Devroye, Natasha; Liu, Tang

doi:10.1109/twc.2015.2512983

Cited by 25 publications

(22 citation statements)

References 44 publications

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“…(20) Proof: The proof is given in Appendix D. Equation (20) can be further simplified as in (21), shown at the top of next page.…”

Section: B Lower-bound Outage Probabilitymentioning

confidence: 99%

“…The authors in [19] analyzed the performance of MIMO FD relaying when null space projection via SVD is used to mitigate the LI interference. In [20], the degrees of freedom of bidirectional interference network is considered by utilizing interference alignment, assuming that the LI is known to the receiver and therefore can be subtracted off completely. However, to the best of our knowledge, the impact of co-channel interference ( CCI) 1 on the performance of MIMO full-duplex relaying has not been investigated yet.…”

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confidence: 99%

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MIMO Full-Duplex Relaying in the Presence of Co-Channel Interference

Almradi

Hamdi

2017

IEEE Trans. Veh. Technol.

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Abstract-This paper studies the deployment of multiple-input multiple-output (MIMO) full-duplex (FD) relaying systems in a multi-cell environment, where the source and destination nodes are equipped with single antenna and communicating via a dualhop amplify-and-forward (AF) relay station with multiple receive and transmit antennas in the presence of co-channel interference (CCI). This paper addresses the fundamental challenges of loopback self-interference (LI) and CCI when incorporating FD relaying in cellular systems. Due to the higher frequency reuse in FD relaying compared to its half-duplex (HD) relaying counterpart, the CCI is expected to double as the FD relay station simultaneously schedule uplink and downlink transmission on the same channel. The optimal design of relay receive and transmit precoding weight vectors which maximizes the overall signal-to-interefernce-plus-noise ratio (SINR) is formulated by a proper optimization problem, then a closed-form suboptimal solution based on null space projection is proposed. The proposed precoding vectors are based on the added receive and transmit zero-forcing (ZF) constraints used to suppress the co-channel interference and loopback self-interfernce, respectively. To this end, exact closed-form expressions for the outage probability and ergodic capacity are derived, where a simpler lower-bound expressions are also presented. In addition, the asymptotic high signal-to-noise ratio (SNR) outage probability approximation is also considered, through which the diversity order of the null space projection (ZF/ZF) scheme is found to achieve min (NR − M, NT − 1), where NR and NT are the number of relay receive and transmit antennas, respectively, and M is the number of CCI interferers. Numerical results sustained by Monte-Carlo simulations show the exactness of the proposed analytical expressions as well as the tightness of the proposed lower-bound expressions. In addition, simulation results for the minimum mean square error (MMSE)/ZF scheme is also considered for comparison purposes. Our results reveal that MIMO FD relaying could substantially boost the system performance compared to its conventional MIMO HD relaying counterpart.Index Terms-MIMO relaying, full-duplex relaying, halfduplex relaying, zero-forcing (ZF), minimum mean square error (MMSE), outage probability, ergodic capacity, co-channel interference.

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“…(20) Proof: The proof is given in Appendix D. Equation (20) can be further simplified as in (21), shown at the top of next page.…”

Section: B Lower-bound Outage Probabilitymentioning

confidence: 99%

mentioning

confidence: 99%

MIMO Full-Duplex Relaying in the Presence of Co-Channel Interference

Almradi

Hamdi

2017

IEEE Trans. Veh. Technol.

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“…With the above definitions and assumptions, the average transmission powers in (11) and (12), average transmission data rates in (13) and (14), and the outage probabilities in (7), (8), (9), and (10) should be manipulated to incorporate the effect of noisy feedback channel. Note that, choosing the transmit power level from a code book only depends on the corresponding channel region index which is feedbacked by the respective transmitter.…”

Section: B Noisy Feedback Channelmentioning

confidence: 99%

“…To perform interference management in D2D underlaying cellular network, one approach is to consider cooperative communications. In this way, a D2D user equipped with multiple antennas acts as an in-band relay to a cellular link where the multi-antenna relay is able to help decoding messages, cancelling interference, and providing multiplexing gain in the network [7]- [9]. In [10], power control problem for the D2D users is investigated in order to optimize the energy efficiency of the user equipments (UEs) as well as to ensure that the quality of service (QoS) of D2D devices and UEs does not fall below the acceptable target.…”

Section: Introduction a Background And Motivationmentioning

confidence: 99%

Limited Feedback Scheme for Device-to-Device Communications in 5G Cellular Networks with Reliability and Cellular Secrecy Outage Constraints

Alavi

Yamchi

Javan

et al. 2017

IEEE Trans. Veh. Technol.

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In this paper, we propose a device to device (D2D) communication scenario underlaying a cellular network where both D2D and cellular users (CUs) are discrete power-rate systems with limited feedback from the receivers. It is assumed that there exists an adversary which wants to eavesdrop on the information transmission from the base station (BS) to CUs. Since D2D communication shares the same spectrum with cellular network, cross interference must be considered. However, when secrecy capacity is considered, the interference caused by D2D communication can help to improve the secrecy communications by confusing the eavesdroppers. Since both systems share the same spectrum, cross interference must be considered. We formulate the proposed resource allocation into an optimization problem whose objective is to maximize the average transmission rate of D2D pair in the presence of the cellular communications under average transmission power constraint. For the cellular network, we require a minimum average achievable secrecy rate in the absence of D2D communication as well as a maximum secrecy outage probability in the presence of D2D communication which should be satisfied. Due to high complexity convex optimization methods, to solve the proposed optimization problem, we apply Particle Swarm Optimization (PSO) which is an evolutionary approach. Moreover, we model and study the error in the feedback channel and the imperfectness of channel distribution information (CDI) using parametric and nonparametric methods. Finally, the impact of different system parameters on the performance of the proposed scheme is investigated through simulations. The performance of the proposed scheme is evaluated using numerical results for different scenarios.

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“…For Signal Alignment II described below, we will only consider the projection of user signals into a subspace of the signal space at each relay. This will relax the signal alignment constraint in (26) at the cost of certain loss of freedom for each relay to process its received signal. A convenient way to select a subspace of dimension N is to deactivate the last N − N antennas at each relay.…”

Section: Signal Alignment IImentioning

confidence: 99%

On the Degrees of Freedom of the Symmetric Multi-Relay MIMO Y Channel

Ding

Yuan

Liew

2017

IEEE Trans. Wireless Commun.

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In this paper, we study the degrees of freedom (DoF) of the symmetric multi-relay multiple-input multiple-output (MIMO) Y channel, where three user nodes, each with M antennas, communicate via K geographically separated relay nodes, each with N antennas. For this model, we establish a general DoF achievability framework based on linear precoding and post-processing methods. The framework poses a nonlinear problem with respect to user precoders, user post-processors and relay precoders. To solve this problem, we adopt an uplink-downlink asymmetric strategy, where the user precoders are designed for signal alignment and the user post-processors are used for interference neutralization. With the user precoder and post-processor designs fixed as such, the original problem then reduces to a problem of relay precoder design. To address the solvability of the system, we propose a general method for solving matrix equations. Together with the techniques of antenna disablement and symbol extension, an achievable DoF of the considered model is derived for an arbitrary setup of (K, M, N ). We show that for K ≥ 2, the optimal DoF is achieved for, ∞ . We also show that the uplink-downlink asymmetric design proposed in this paper considerably outperforms the conventional approach based on uplink-downlink symmetry.

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The Degrees of Freedom of Full-Duplex Bidirectional Interference Networks With and Without a MIMO Relay

Cited by 25 publications

References 44 publications

MIMO Full-Duplex Relaying in the Presence of Co-Channel Interference

MIMO Full-Duplex Relaying in the Presence of Co-Channel Interference

Limited Feedback Scheme for Device-to-Device Communications in 5G Cellular Networks with Reliability and Cellular Secrecy Outage Constraints

On the Degrees of Freedom of the Symmetric Multi-Relay MIMO Y Channel

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