Relay Beamforming in Cognitive Two-Way Networks with Imperfect Channel State Information

Safavi, Seyed Hamid; Ardebilipour, Mehrdad; Salari, Soheil

doi:10.1109/wcl.2012.051112.120163

Cited by 49 publications

(30 citation statements)

References 13 publications

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“…1 are modeled as random values. In this paper, similar to [2]- [4], it is assumed that the joint Second-Order Statistics (SOS) of the channel gains are available at the SN. This approach allows us to consider uncertainty in the channel models through introducing the covariance matrices of the channels.…”

Section: Problem Formulationmentioning

confidence: 99%

“…In particular, distributed relay beamforming [2], is a powerful tool which has attracted especial interest in cognitive networks, e.g. in [3], [4], [5]. In this technique the relays of the cognitive network cooperate adjusting their transmission weights in order to form a beam to the secondary destination, mitigating the effect of the undesired bidirectional interferences between the primary and the secondary networks and improving the QoS at the secondary receivers.…”

Section: Introductionmentioning

confidence: 99%

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Relay subset selection in cognitive networks with imperfect CSI and individual power constraints

Blanco

Nájar

2015

2015 23rd European Signal Processing Conference (EUSIPCO)

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This paper considers the relay subset selection problem in an underlay cognitive network in which two secondary users communicate assisted by a set of N potential relays. More specifically, this paper deals with the joint problem of choosing the best subset of L secondary relays and their corresponding weights which maximize the Signal-toInterference-plus-Noise ratio (SINR) at the secondary user receiver, subject to per-relay power constraints and interference power constraints at the primary user. This problem is a combinatorial problem with a high computational burden. Nevertheless, we propose a sub-optimal technique, based on a convex relaxation of the problem, which achieves a nearoptimal performance with a reduced complexity. Contrary to other approaches in the literature, the secondary relays are not limited to cooperate at full power.

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Section: Problem Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Relay subset selection in cognitive networks with imperfect CSI and individual power constraints

Blanco

Nájar

2015

2015 23rd European Signal Processing Conference (EUSIPCO)

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“…The concept of cognitive radio (CR) is first proposed by Dr. Mitola in 1999 [1].CRN is a popular method in improving the performance of the secondary users (SUs) and guaranteeing the QoS of the primary users (PUs).Now most of the research works is based on the known ideal channel state information (CSI) which is hard to obtain in practice, however, nonideal CSI will affect the performance of the network seriously [2].So more and more scholars are interested in the robust beamforming algorithms in the non-cognitive or cognitive relay network and have published many papers about this topic [3][4].…”

Section: Introductionmentioning

confidence: 99%

Robust Beamforming Problem in Cognitive One-way Relay Networks

Cai¹,

Wang²

2016

IJFGCN

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“…The transmissions of the secondary users will cause more interference at the primary users with imperfect channel state information. The authors of [24][25][26][27][28] have studied the transmission performances of the primary and secondary systems under imperfect channel state information.…”

Section: Introductionmentioning

confidence: 99%

Outage performance of relay-assisted primary and secondary transmissions in cognitive relay networks

Zhao

Sun

Chen

et al. 2014

J Wireless Com Network

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In this paper, a two-phase protocol for relay-assisted spectrum sharing in cognitive relay network is proposed. The primary system comprises a transmitter-receiver pair (PT-PR) and a decode-and-forward relay (Relay), while the secondary system comprises a transmitter-receiver pair (ST-SR). In the proposed protocol, the Relay assists the transmissions of the primary users as well as the secondary users where there is no direct link between the ST and the SR. Outage probabilities of the primary system and the secondary system are derived and verified through simulations. Compared with the protocol without cooperation, better outage performance of the primary system is achieved. Meanwhile, though the ST causes interference to the PR, the interference is compensated by the cooperation of the Relay. Moreover, the proposed protocol realizes the communications of the secondary users on the condition that the secondary transmission link is not ideal.

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Relay Beamforming in Cognitive Two-Way Networks with Imperfect Channel State Information

Cited by 49 publications

References 13 publications

Relay subset selection in cognitive networks with imperfect CSI and individual power constraints

Relay subset selection in cognitive networks with imperfect CSI and individual power constraints

Robust Beamforming Problem in Cognitive One-way Relay Networks

Outage performance of relay-assisted primary and secondary transmissions in cognitive relay networks

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