Investigation of Mutual Interference Channel with Relay in Cognitive Transmission

Cheng, Ming; Mao, Jingli; Li, Lee

doi:10.1109/wicom.2008.291

Cited by 5 publications

(4 citation statements)

References 8 publications

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“…With the assumption that the secondary transmitter has non-causal knowledge of the codewords originated at the primary transmitter, achievable rates of the secondary user were characterized under the constraint that no rate degradation was created for the primary system. As a variant of [26], a spectrum sharing protocol was proposed between a primary and a secondary user on an IFC-CR in [27]. With the assumption that non-causal knowledge of the primary codewords is available at both the secondary transmitter and the CR, an enhanced throughput was achieved for the secondary user without degrading the throughput of the primary user.…”

Section: Background and Related Workmentioning

confidence: 99%

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Spectrum sharing on interference channels with a cognitive relay

Pandharipande

Ting³

et al. 2015

J Wireless Com Network

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In this paper, an interference channel with a cognitive relay (IFC-CR) is considered to achieve spectrum sharing between a licensed primary user and an unlicensed secondary user. The CR assists both users in relaying their messages to the respective receivers, under the constraint that the performance of the legacy primary user is not degraded. Without requiring any non-causal knowledge, the CR uses a successive interference cancellation to first decode the primary and secondary messages after a transmission phase. A power allocation is then performed to forward a linear weighted combination of the processed signals in the relaying phase. Closed-form expressions of the end-to-end outage probability are derived for both primary and secondary users under the proposed approach. Furthermore, by exploiting the decoded primary and secondary messages in the first phase, we propose the use of dirty paper coding (DPC) at CR to pre-cancel the interference seen at the secondary (or primary) receiver in the second phase, which results in a performance upper bound for the secondary (or primary) user without affecting the other user. Simulation results demonstrate that with a joint consideration of the power control at the secondary transmitter and the power allocation at CR, performance gains can be achieved for both primary and secondary users.

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Section: Background and Related Workmentioning

confidence: 99%

“…Substituting (23), (25), (27), and (29) into (9), we can thus obtain the end-to-end outage probability O P of the primary system. Theorem 2.…”

Section: Conditioned On Event E (4)mentioning

confidence: 99%

Spectrum sharing on interference channels with a cognitive relay

Pandharipande

Ting³

et al. 2015

J Wireless Com Network

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“…different assisted objects. For example, the secondary user may act as cognitive relay for one another to improve the throughput of secondary system [6], decrease the outage probability of secondary link [7], or reduce the interference caused to the primary system [8,9]. More specially, the secondary user may even use parts of its power to forward the primary user's signal [10], which achieves the largest rate of secondary link without bringing down the channel capacity of primary link.…”

Section: Introductionmentioning

confidence: 99%

Opportunistic Cognitive Relaying: A Win-Win Spectrum Sharing Scheme

Luo

Zhang

Chen

et al. 2010

J Wireless Com Network

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A cost-effective spectrum sharing architecture is proposed to enable the legacy noncognitive secondary system to coexist with the primary system. Specifically, we suggest to install a few intermediate nodes, namely, the cognitive relays, to conduct the spectrum sensing and coordinate the spectrum access. To achieve the goal of win-win between primary and secondary systems, the cognitive relay may act as a cooperator for both of them, and an Opportunistic Cognitive Relaying (OCR) scheme is specially devised. In this scheme, the cognitive relay opportunistically switches among three different working modes, that is, Relay for Primary Link (RPL), Relay for Secondary Link (RSL), or Relay for Neither of the Links (RNL), respectively, based on the channel-dependent observation of both systems. In addition, the transmit power for cognitive relay and secondary transmitter in each mode are optimally determined by maximizing the transmission rate of secondary system while keeping or even reducing the outage probability of primary system. Simulation results validate the efficiency of the proposed spectrum sharing scheme.

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“…In [13], the authors have suggested a Cooperative Relay Scheme to increase the SINR at secondary receivers and defined a game to study the competition for shared spectrum among SUs. In [15] the mutual interference channel for cognitive relays has been investigated. Improved secondary performance by appropriate power allocation and beamforming in a heterogeneous cognitive relay system is discussed in [14].…”

Section: Introductionmentioning

confidence: 99%

Judicious power loading for a cognitive relay scenario

Nadkar

Thumar

Desai

et al. 2009

2009 International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS)

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Abstract-This paper introduces a power loading strategy for relays to be used in a cognitive scenario. A cognitive relay node allows unlicensed (secondary) users to concurrently operate with licensed (primary) users, thereby improving spectral efficiency. The dynamic spectrum access in an OFDM-based cognitive relay network may lead to unwanted interference to the primary user from the side lobes of the secondary users. Two judicious algorithms are formulated by means of which the cognitive relay meets the twofold challenge of achieving optimum system throughput while ensuring minimum interference to the primary. The simulation results demonstrate that the suggested algorithms exhibit enhanced channel capacity for the secondary users as compared to traditional power allocation methods.

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Investigation of Mutual Interference Channel with Relay in Cognitive Transmission

Cited by 5 publications

References 8 publications

Spectrum sharing on interference channels with a cognitive relay

Spectrum sharing on interference channels with a cognitive relay

Opportunistic Cognitive Relaying: A Win-Win Spectrum Sharing Scheme

Judicious power loading for a cognitive relay scenario

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