Relay-aided Interference Alignment for the quasi-static interference channel

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

doi:10.1109/isit.2010.5513393

Cited by 42 publications

(11 citation statements)

References 12 publications

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“…In this regard, the fundamental question boils down to whether relaying is capable of facilitating interference alignment at all. Existing works [83][84][85] answer this question in the affirmative by revealing strategies of how relays can be utilized to transform a static channel into an equivalent time-varying channel such that full DoF is attainable through interference alignment. In [86], Ning et al presents a relay-aided interference alignment scheme that results in the optimal DoF of the D-user interference channel with finite channel uses.…”

Section: Distributed Interference Networkmentioning

confidence: 99%

A Survey on Robust Interference Management in Wireless Networks

Kakar

Sezgin

2017

Entropy

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Recent advances in the characterization of fundamental limits on interference management in wireless networks and the discovery of new communication schemes on how to handle interference led to a better understanding towards the capacity of such networks. The benefits in terms of achievable rates of powerful schemes handling interference, such as interference alignment, are substantial. However, the main issue behind most of these results is the assumption of perfect channel state information at the transmitters (CSIT). In the absence of channel knowledge the performance of various interference networks collapses to what is achievable by time division multiple access (TDMA). Robustinterference management techniques are promising solutions to maintain high achievable rates at various levels of CSIT, ranging from delayed to imperfect CSIT. In this survey, we outline and study two main research perspectives of how to robustly handle interference for cases where CSIT is imprecise on examples for non-distributed and distributed networks, namely broadcast and X-channel. To quantify the performance of these schemes, we use the well-known (generalized) degrees of freedom (GDoF) metric as the pre-log factor of achievable rates. These perspectives maintain the capacity benefits at similar levels as for perfect channel knowledge. These two perspectives are: First, scheme-adaptation that explicitly accounts for the level of channel knowledge and, second, relay-aided infrastructure enlargement to decrease channel knowledge dependency. The relaxation on CSIT requirements through these perspectives will ultimately lead to practical realizations of robust interference management techniques. The survey concludes with a discussion of open problems.

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Section: Distributed Interference Networkmentioning

confidence: 99%

A Survey on Robust Interference Management in Wireless Networks

Kakar

Sezgin

2017

Entropy

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“…The first k rows of G k 2i are all zero and M k=0 h −k ji G k ji contains higher order terms as the row index increases. The received signal space Γ 1 for receiver 1 is defined similarly to (11). Then, the ith column…”

Section: Ia Scheme With Two Half-duplex Relaysmentioning

confidence: 99%

“…Nourani et al [10, 11] proposed relay‐aided IA schemes for the quasi‐static X channel and interference channel, respectively. They used full‐duplex relays with some memories and proved that the beamforming vectors for the IA can be designed for the quasi‐static fading channel environment.…”

Section: Introductionmentioning

confidence: 99%

New interference alignment schemes with full and half‐duplex relays for the quasi‐static X channel

Jin

Shin

2014

IET Communications

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In this study, two relay-aided interference alignment (IA) schemes are proposed for the quasi-static M × 2 X channel where M is the number of transmitters and two is the number of receivers, respectively. The first scheme utilises one full-duplex relay and the second one utilises two half-duplex relays. In the proposed schemes, the transmitters transmit signals in every time slot and the relays operate in the amplify-and-forward (AF) mode. By verifying the linear independence between the desired signals and the interference, it is shown that the proposed schemes can achieve 2M/(M + 1) degrees of freedom (DoF) which is the maximum DoF for the M × 2 X channel. It is also shown by using the concept of reciprocity that the proposed IA schemes are applicable to the 2 × M X channel. Finally, through the numerical analysis, it is confirmed that the proposed IA schemes provide good alternatives to the previously known relay-aided IA scheme.

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“…In fact, there exist cases in relay-aided IA in which all non-trivial interference-nulling solutions are invalid. The feasibility conditions for relay-aided IA in fully connected networks are studied in [4].…”

Section: Introductionmentioning

confidence: 99%

Feasibility Conditions for Relay-Aided Interference Alignment in Partially Connected Networks

Al-Shatri

Ganesan

et al. 2013

2013 IEEE 77th Vehicular Technology Conference (VTC Spring)

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In this paper, we investigate the feasibility conditions for relay-aided interference alignment in a class of partially connected networks. The considered scenario consists of several single-antenna communicating node pairs and multiple singleantenna amplify-and-forward relays. Some of the direct links between the source and the destination nodes may have zero gain. A two-hop transmission scheme is applied. The relays' scaling factors, along with the transmit and receive filters, are adapted to the channel to null the interference signals at every destination node. However, this would also null the desired useful signal at certain destinations if the number of relays is insufficient. To avoid this, the required number of relays is studied. We show that the required number of relays depends on the rank of the incidence matrix of a graph defined by the topology of the direct links.

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Relay-aided Interference Alignment for the quasi-static interference channel

Cited by 42 publications

References 12 publications

A Survey on Robust Interference Management in Wireless Networks

A Survey on Robust Interference Management in Wireless Networks

New interference alignment schemes with full and half‐duplex relays for the quasi‐static X channel

Feasibility Conditions for Relay-Aided Interference Alignment in Partially Connected Networks

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