Multiuser cognitive radio networks: an information-theoretic perspective

Nagananda, K. G.; Mohapatra, Parthajit; Murthy, Chandra R.; Kishore, Shalinee

doi:10.1007/s12572-013-0079-1

Cited by 10 publications

(8 citation statements)

References 44 publications

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“…The 3-CIFC-CoMS scenario was later introduced in [42]. Achievable rate regions for the discrete memoryless channel were obtained and were numerically evaluated for the Gaussian noise channel; a numerical comparison of the achievable rates in Gaussian noise was made in [39]. Inner and outer bounds for the special case of the 3-CIFC-CoMS in which the cognitive user is assumed not to interfere with the primary users were obtained in [43].…”

Section: B the Three-user Cognitive Interference Channel (3-cifc)mentioning

confidence: 99%

Multi-user Cognitive Interference Channels: A Survey and New Capacity Results

Maamari¹,

Tuninetti²,

Devroye³

2015

IEEE Trans. Cogn. Commun. Netw.

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This paper provides a survey of the state-of-the-art information theoretic analysis for overlay multi-user (more than two pairs) cognitive networks and reports new capacity results. In an overlay scenario, cognitive / secondary users share the same frequency band with licensed / primary users to efficiently exploit the spectrum. They do so without degrading the performance of the incumbent users, and may possibly even aid in transmitting their messages as cognitive users are assumed to possess the message(s) of primary user(s) and possibly other cognitive user(s). The survey begins with a short overview of the two-user overlay cognitive interference channel. The evolution from two-user to three-user overlay cognitive interference channels is described next, followed by generalizations to multi-user (arbitrary number of users) cognitive networks. The rest of the paper considers K-user cognitive interference channels with different message knowledge structures at the transmitters.Novel capacity inner and outer bounds are proposed. Channel conditions under which the bounds meet, thus characterizing the information theoretic capacity of the channel, for both Linear Deterministic and Gaussian channel models, are derived.The results show that for certain channel conditions distributed cognition, or having a cumulative message knowledge structure at the nodes, may not be worth the overhead as (approximately) the same capacity can be achieved by having only one global cognitive user whose role is to manage all the interference in the network. The paper concludes with future research directions.In this paper, we survey the fundamental limits of communication for a multi-user overlay cognitive networks with an arbitrary number of secondary / cognitive user(s) having non-causal message knowledge of primary user(s). The users transmit in the same frequency band and thus in general interfere with one another. The performance metric considered is the information theoretic notion of channel capacity. In other words, we are interested in the maximum rate of communication for which arbitrarily small probability of error can be achieved by every user, which may be seen as a benchmark when building practical systems. We will focus on results for general memoryless and practically relevant additive white Gaussian noise (AWGN) [2] channel models, as well as high signal to noise ratio (SNR) approximations of Gaussian is currently an Associate Editor for the IEEE Transactions on Cognitive Communications and Networking. Her research focuses on multi-user information theory and applications to cognitive and software-defined radio, radar, relay and two-way communication networks.

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Section: B the Three-user Cognitive Interference Channel (3-cifc)mentioning

confidence: 99%

Multi-user Cognitive Interference Channels: A Survey and New Capacity Results

Maamari¹,

Tuninetti²,

Devroye³

2015

IEEE Trans. Cogn. Commun. Netw.

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“…While not much work on K > 3 channels exists, in [5], [7]- [10] different three-user cognitive channels are considered; we note that the models differ from the one considered here either in the number of transmitter/receivers, or in the message sharing/cognition structure in all but [5], [7]. In the more comprehensive [7], several types of 3-user cognitive interference channels are proposed: that with "cumulative message sharing" (CMS) as considered here, that with "primary message sharing" where the message of the single primary user is known at both cognitive transmitters (who do not know each others' messages), and finally "cognitive only message sharing" (CoMS) where there are two primary users who do not know each others' message and a single cognitive user which knows both primary messages. Achievable rate regions for are obtained which are evaluated in Gaussian noise.…”

Section: A Past Workmentioning

confidence: 99%

Approximate Sum-Capacity of K-user Cognitive Interference Channels with Cumulative Message Sharing

Maamari

Tuninetti

Devroye

2014

IEEE J. Select. Areas Commun.

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This paper considers the K-user cognitive interference channel with one primary and K − 1 secondary/cognitive transmitters with a cumulative message sharing structure, i.e., cognitive transmitter i ∈ [2 : K] knows non-causally all messages of the users with index less than i. We propose a computable outer bound valid for any memoryless channel. We first evaluate the sum-rate outer bound for the high-SNR linear deterministic approximation of the Gaussian noise channel. This is shown to be capacity for the 3-user channel with arbitrary channel gains and the sum-capacity for the symmetric K-user channel.Interestingly, for the K user channel having only the K-th cognitive transmitter know all other messages is sufficient to achieve capacity, i.e., cognition at transmitters 2 to K − 1 is not needed. Next, the sumcapacity of the symmetric Gaussian noise channel is characterized to within a constant additive and multiplicative gap. The proposed achievable scheme for the additive gap is based on Dirty Paper Coding and can be thought of as a MIMO-broadcast scheme where only one encoding order is possible due to the message sharing structure. As opposed to other multiuser interference channel models, a single scheme suffices for both the weak and strong interference regimes. With this scheme, the generalized degrees of freedom (gDoF) is shown to be a function of K, in contrast to the non cognitive case and the broadcast channel case. Interestingly, it is show that as the number of users grows to infinity the gDoF of the K-user cognitive interference channel with cumulative message sharing tends to the gDoF of a broadcast channel with a K-antenna transmitter and K single-antenna receivers. The analytical additive additive and multiplicative gaps are a function of the number of users. Numerical evaluations of inner and outer bounds show that the actual gap is less than the analytical one.

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“…In [4], [6]- [10] different 3-user cognitive channels are considered which differ from the one considered here either in the number of transmitter/receivers, or in the message sharing/cognition structure in all but [4], [6], [7]. In [7], several types of 3-user cognitive interference channels are proposed: that with "cumulative message sharing" (CMS) as considered here, that with "primary message sharing" where the message of the single primary user is known at both cognitive transmitters, and finally "cognitive only message sharing" (CoMS) where there are two primary users who do not know each others' message and a single cognitive user which knows both primary messages. In [6] the sum-capacity for the 3-user channel with CMS for the linear deterministic channel (LDC) is obtained -our work generalizes this to K-users and to the Gaussian noise channel, where a constant gap to capacity is obtained.…”

Section: Introductionmentioning

confidence: 99%