Relay-aided interference alignment for the quasi-static X channel

Nourani, B.; Motahari, Seyed Abolfazl; Khandani, Amir K.

doi:10.1109/isit.2009.5205269

Cited by 41 publications

(35 citation statements)

References 8 publications

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“…For instance, while for X channel with perfect CSIT including a relay does not improve the achievable degrees of freedom (DoF) [6], [7], for the same X channel without CSIT including relays provides DoF gains. More specifically, the work in [8] has studied the gains of including a half-duplex amplify-and-forward (AF) relay in the two-user X channel without CSIT, where it is shown that for single-antenna X channel without CSIT, the DoF is 4 3 .…”

mentioning

confidence: 99%

Relay X channels without channel state information at the transmit sides: Degrees of freedom

Zebardast

Tajer

Maham

et al. 2015

2015 IEEE Wireless Communications and Networking Conference (WCNC)

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Abstract-This paper focuses on the two-user relay-assisted X channel with no channel state information (CSI) available at the transmitter side. Two relaying modes, namely half-duplex decode-and-forward (DF) and cognitive relays, are considered and the degrees of freedom (DoF) are characterized. It is shown that assisted by a half-duplex DF relay which is equipped with 2M -antennas, the X channel with two M -antenna users hasDoF, which is achievable through interference alignment (IA). Furthermore, it is shown that in this channel, M -antenna cognitive relay (with non-causal access to information streams) provides 2M DoF using interference cancellation (IC) technique. In this setting, IC outperforms interference alignment in the cognitive relay mode, since the latter achieves 4M 3 DoF.Index Terms-degrees of freedom; relay X channel; decodeand-forward relay; cognitive relay.

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mentioning

confidence: 99%

Relay X channels without channel state information at the transmit sides: Degrees of freedom

Zebardast

Tajer

Maham

et al. 2015

2015 IEEE Wireless Communications and Networking Conference (WCNC)

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“…The idea of IA has been applied in interference MIMO relay systems in [7,8]. However, there is still no general solution for IA as a number of conditions must be met.…”

Section: Introductionmentioning

confidence: 99%

“…Three iterative transceiver design algorithms to minimize either the matrix-weighted sum mean-squared error (SMSE) or the total leakage have been developed in [10]. However, the works in [7,10] did not take the direct source-destination links into consideration.…”

Section: Introductionmentioning

confidence: 99%

MMSE-based joint source and relay optimization for interference MIMO relay systems

Nguyen

Rong

Nordholm

2015

J Wireless Com Network

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In this paper, we investigate the transceiver design for amplify-and-forward (AF) interference multiple-input multiple-output (MIMO) relay communication systems when the direct links between the source and destination nodes are taken into consideration. The minimum mean-squared error (MMSE) of the signal waveform estimation at the destination nodes is chosen as the design criterion to optimize the source, relay, and receiver matrices for interference suppression. As the joint source, relay, and receiver optimization problem is nonconvex with matrix variables, a globally optimal solution is computationally intractable to obtain. We propose two iterative algorithms to provide computationally efficient solutions to the original problem through solving convex subproblems. These two algorithms provide efficient performance-complexity trade-off. Simulation results demonstrate that the proposed algorithms converge quickly after a few iterations and significantly outperform existing scheme in terms of the system bit error rate.

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“…In this reference, each node has full CSI and the network is fully connected. The impact of relaying on the interference alignment schemes of fully connected wireless networks so far mainly focuses on making the schemes more practical, that is, to reduce the requirement for time extension or to accommodate for static channels [14]- [17]. For networks with relays that are not fully connected, e.g., the multi-hop relay networks, reference [18] has studied the DoF under full CSIT and proposed an interference neutralization to achieve the mincut DoF of the network.…”

Section: Introductionmentioning

confidence: 99%

Relays can provide alignment for the K-user interference channel without channel state information at the transmitters

Tian

Yener

2012

2012 IEEE 13th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

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Abstract-Channel state information at the transmitters (CSIT) is of importance for interference alignment schemes to achieve the optimal degrees of freedom (DoF) for wireless networks. This paper focuses on the K-user interference channel and shows that, employing relays between the sources and the destinations, interference alignment is possible without CSIT. Furthermore, the optimal DoF can be achieved with the help of relays. Specifically, a transmission strategy is designed and it is shown that the DoF K 2 can be achieved with a two-slot transmission strategy using either (i) one relay with K − 1 antennas, or (ii) K(K − 2) single antenna relays. It is also shown that when each relay is equipped with L antennas, we needrelays to achieve the optimal DoF.

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Relay-aided interference alignment for the quasi-static X channel

Cited by 41 publications

References 8 publications

Relay X channels without channel state information at the transmit sides: Degrees of freedom

Relay X channels without channel state information at the transmit sides: Degrees of freedom

MMSE-based joint source and relay optimization for interference MIMO relay systems

Relays can provide alignment for the K-user interference channel without channel state information at the transmitters

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