Interference Alignment in Multi-User Two Way Relay Networks

Ganesan, Rakash SivaSiva; Weber, Tobias; Klein, Anja

doi:10.1109/vetecs.2011.5956515

Cited by 41 publications

(58 citation statements)

References 9 publications

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“…and the achievable DoF is 2K d. For this case, the DoF upper bound becomes [22] is indeed the optimal DoF. We now have seen that the newly derived upper bound is useful for proving tight results for some special cases of the MIMO multi-way relay channel.…”

Section: A Optimality Of Achievable Dof For Special Cases In Previoumentioning

confidence: 78%

“…• MIMO K -pair two-way relay channel [22]: This corresponds to the MIMO multi-way relay channel with K clusters each with two users. Each user has M antennas and wants to transmit d data streams with DoF 1.…”

Section: A Optimality Of Achievable Dof For Special Cases In Previoumentioning

confidence: 99%

“…In reference [21], the signal space alignment idea is extended to the K -user Y channel, which has K users in a single cluster that want to exchange information, and the achievable DoF is established. For the MIMO multi-pair two-way relay channel, reference [22] has studied the requirement for the number of antennas at the users to allow them exchange information with the help of the relay without interfering each other in the symmetric setting. The DoF of this channel is further studied in reference [23].…”

mentioning

confidence: 99%

“…We utilize the idea of signal space alignment in [20]- [22], where the users utilize the signal space of the relay in common, and the relay can decode a function of the transmitted signals from a pair of users and multiple-access transmission, where the users do not share the signal space of the relay, and the relay simply decodes the transmitted signals as in the multiple access channel to establish the achievability results.…”

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confidence: 99%

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Degrees of Freedom for the MIMO Multi-Way Relay Channel

Tian

Yener

2014

IEEE Trans. Inform. Theory

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Abstract-This paper investigates the degrees of freedom (DoF) of the L-cluster, K -user MIMO multiway relay channel, where users in each cluster wish to exchange messages within the cluster, and they can only communicate through the relay. A novel DoF upper bound is derived by providing users with carefully designed genie information. Achievable DoF is identified using signal space alignment and multiple-access transmission. For the two-cluster MIMO multiway relay channel with two users in each cluster, the DoF is established for the general case when users and the relay have arbitrary number of antennas, and it is shown that the DoF upper bound can be achieved using signal space alignment or multiple-access transmission, or a combination of both. The result is then generalized to the three user case. For the L-cluster K -user MIMO multiway relay channel in the symmetric setting, conditions under which the DoF upper bound can be achieved are established. In addition to being shown to be tight in a variety of scenarios of interests of the multiway relay channel, the newly derived upperbound also establishes the optimality of several previously established achievable DoF results for multiuser relay channels that are special cases of the multiway relay channel.Index Terms-MIMO multi-way relay channel, degrees of freedom, signal space alignment, interference alignment.

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Section: A Optimality Of Achievable Dof For Special Cases In Previoumentioning

confidence: 78%

Section: A Optimality Of Achievable Dof For Special Cases In Previoumentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Degrees of Freedom for the MIMO Multi-Way Relay Channel

Tian

Yener

2014

IEEE Trans. Inform. Theory

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“…It includes several special cases: K-user MIMO Y channel [12], multi-pair MIMO two-way relay channel [13]- [17], and L-cluster K-user MIMO multiway relay channel [18], [19]. However, the exact capacity analysis for these channels is extremely challenging, only constant-gap capacity is known in the simplest scenario [20], [21].…”

Section: Introductionmentioning

confidence: 99%

Optimal DoF Region for the Asymmetric Two-Pair MIMO Two-Way Relay Channel

Liu

Tao

Yuan

2017

IEEE Trans. Signal Process.

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In this paper, we study the optimal degrees of freedom (DoF) region for the two-pair MIMO two-way relay channel (TWRC) with asymmetric antenna setting, where two pairs of users exchange information with the help of a common relay. Each user i is equipped with M i antennas, for i = 1, 2, 3, 4, and the relay is equipped with N antennas. First, we derive an outer bound of the DoF region by using the cutset theorem and the genie-message approach. Then, we propose a new transmission scheme to achieve the outer bound of the DoF region. Due to the asymmetric data exchange, where the two users in each pair can communicate a different number of data streams, we not only need to form the network-coded symbols but also need to process the additional asymmetric data streams at the relay. This is realized through the joint design of relay compression matrix and source precoding matrices. After obtaining the optimal DoF region, we study the optimal sum DoF by solving a linear programming problem. From the optimal DoF region of this channel, we show that in the asymmetric antenna setting, some antennas at certain source nodes are redundant and cannot contribute to enlarge the DoF region. We also show that there is no loss of optimality in terms of the sum DoF by enforcing symmetric data exchange, where the two users in each pair are restricted to communicate the same number of data streams. Index TermsMultiple-input multiple-output, two-way relay channel, interference alignment, physical-layer network coding, signal alignment, degrees of freedom.

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Interference Alignment Aided by Non-Regenerative Relays

Ganesan

Al-Shatri

et al. 2016

Communications in Interference Limited Networks

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Interference Alignment in Multi-User Two Way Relay Networks

Cited by 41 publications

References 9 publications

Degrees of Freedom for the MIMO Multi-Way Relay Channel

Degrees of Freedom for the MIMO Multi-Way Relay Channel

Optimal DoF Region for the Asymmetric Two-Pair MIMO Two-Way Relay Channel

Interference Alignment Aided by Non-Regenerative Relays

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