Opportunistic interference management

Khude, Nilesh; Prabhakaran, Vinod M.; Viswanath, Pramod

doi:10.1109/isit.2009.5205335

Cited by 21 publications

(38 citation statements)

References 6 publications

(6 reference statements)

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“…Theorem 1 (LD setup capacity): The capacity region for (R (1) , R (2) ) in the LD setup is given by the following rate inequalities,…”

Section: Resultsmentioning

confidence: 99%

“…An intuitive interpretation of ∆ comes from our inner bounds; ∆ > 0 implies there are enough levels in subcarriers with α j > 2 (very strong interference) to recover the interfered signals for subcarriers with α j ≤ 1 (weak interference) and 1 < α j ≤ 2 (strong interference). The details of the rate tuples (R (1) , R (2) ) marked in Figure 3 are listed below: Symmetric capacity (C sym ) for ∆ < 0 and ∆ ≥ 0 is given by R C = p 1+p ∆ + ∑ M j=1 n j and R NC = p 2 ∆ + ∑ M j=1 n j respectively.…”

Section: Resultsmentioning

confidence: 99%

“…In [1] and [2], the problem of harnessing bursty interference was studied for a single carrier setup without feedback. A multicarrier version of [1] was studied in [7]. To study benefits of feedback, [6] considered a single carrier setup with bursty interference and output feedback from the receivers.…”

Section: Introductionmentioning

confidence: 99%

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Harnessing bursty interference in multicarrier systems with feedback

Mishra

Wang

Diggavi

2014

2014 IEEE International Symposium on Information Theory

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We study parallel symmetric 2-user interference channels when the interference is bursty and feedback is available from the respective receivers. Presence of interference in each subcarrier is modeled as a memoryless Bernoulli random state. The states across subcarriers are drawn from an arbitrary joint distribution with the same marginal probability for each subcarrier and instantiated i.i.d. over time. For the linear deterministic setup, we give a complete characterization of the capacity region. For the setup with Gaussian noise, we give outer bounds and a tight generalized degrees of freedom characterization. We propose a novel helping mechanism which enables subcarriers in very strong interference regime to help in recovering interfered signals for subcarriers in strong and weak interference regimes. Depending on the interference and burstiness regime, the inner bounds either employ the proposed helping mechanism to code across subcarriers or treat the subcarriers separately. The outer bounds demonstrate a connection to a subset entropy inequality by Madiman and Tetali [4].

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“…Theorem 1 (LD setup capacity): The capacity region for (R (1) , R (2) ) in the LD setup is given by the following rate inequalities,…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Harnessing bursty interference in multicarrier systems with feedback

Mishra

Wang

Diggavi

2014

2014 IEEE International Symposium on Information Theory

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Section: Related Workmentioning

confidence: 99%

“…Some work has been done on bursty interference networks [2], [12]- [15]. Khude-Prabhakaran-Viswanath first studied a two-user bursty IC and characterized the capacity region of a deterministic model [12]. Wang-Diggavi examined a two-user bursty IC with and without feedback and characterized the capacity region of a bursty Gaussian IC to within a bounded gap [13].…”

Section: Related Workmentioning

confidence: 99%

Degrees of freedom of bursty multiple access channels with a relay

Kim

Suh

2015

2015 53rd Annual Allerton Conference on Communication, Control, and Computing (Allerton)

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We investigate the role of a relay in multiple access channels (MACs) with bursty user traffic, where intermittent data traffic restricts the users to bursty transmissions. As our main result, we characterize the degrees of freedom (DoF) region of a K-user bursty multi-input multi-output (MIMO) Gaussian MAC with a relay, where Bernoulli random states are introduced to govern bursty user transmissions. To that end, we extend the noisy network coding scheme to achieve the cut-set bound. Our main contribution is in exploring the role of a relay from various perspectives.First, we show that a relay can provide a DoF gain in bursty channels, unlike in conventional non-bursty channels.Interestingly, we find that the relaying gain can scale with additional antennas at the relay to some extent. Moreover, observing that a relay can help achieve collision-free performances, we establish the necessary and sufficient condition for attaining collision-free DoF. Lastly, we consider scenarios in which some physical perturbation shared around the users may generate data traffic simultaneously, causing transmission patterns across them to be correlated. We demonstrate that for most cases in such scenarios, the relaying gain is greater when the users' transmission patterns are more correlated, hence when more severe collisions take place. Our results have practical implications in various scenarios of wireless networks such as device-to-device systems and random media access control protocols. I. INTRODUCTIONRelays have been considered unable to provide degrees-of-freedom (DoF) gains in standard information-theoretic channels in which transmitters are assumed to send signals at all times [1]. From these results, it may seem reasonable to think of relays as not playing much of a role in improving the performance of most channels. The purpose of this work is to show that it is yet premature to conclude so. In practice, transmitters in most wireless networks do not send signals all the time, unlike in the standard information-theoretic models. Rather, they exhibit bursty natures. Intermittent data traffic makes the availability of data for transmission limited at transmitters, as opposed to the conventional assumption in the standard models. This leads to bursty signal transmissions. Investigating such practical networks, which we call bursty networks hereby, a recent study has found that a relay can offer a DoF gain in bursty interference channels (ICs) and also help achieving interference-free DoF performances [2]. Likewise, subsequently in this work, we demonstrate that a relay in bursty multiple access channels (MACs) can also provide much benefits playing interesting roles.S. Kim is with Electronics and Telecommunications Research Institute, South Korea.

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