Underlay Cognitive Radio with Full or Partial Channel Quality Information

Yi, Na; Ma, Yi; Tafazolli, Rahim

doi:10.1155/2010/105723

Cited by 14 publications

(9 citation statements)

References 18 publications

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“…As stated in [23,24], such assumption is possible if both the PU and the SU are either using a uniform standard for communication based on publicized codebooks or broadcasting their own codebooks periodically. As stated in [23,24], such assumption is possible if both the PU and the SU are either using a uniform standard for communication based on publicized codebooks or broadcasting their own codebooks periodically.…”

Section: System Modelmentioning

confidence: 99%

“…or improving PU's transmission by applying sophisticated signal processing and coding. As stated in [23,24], such assumption is possible if both the PU and the SU are either using a uniform standard for communication based on publicized codebooks or broadcasting their own codebooks periodically. In particular, to improve the spatial diversity order, the technique of relaying has been introduced into CRN.…”

mentioning

confidence: 99%

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Outage performance of cognitive radio networks with multiple decode‐and‐forward relays

Wang

Lin

et al. 2016

Int J Communication

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This paper considers the cognitive radio network with one primary user (PU), one secondary user (SU), and multiple decode-and-forward relays. We propose a relaying scheme to ensure the priority of primary transmission, where the relays are used to forward PU's message and sometimes also SU's message. First, SU is allowed to use the spectrum to transmit only when its transmission would not affect the decoding status of PU's message at all relays. Second, once the secondary transmission happens, the relays that successively decode SU's message are allowed to retransmit this message when it would not affect the decoding status of PU's message at primary receiver. The interference from PU to SU and the interference from SU to PU are both considered. By analyzing the decoding status of primary message and secondary message at different relays, we formulate the outage probabilities of both primary transmission and secondary transmission. When all channels follow Rayleigh distributions, we derive the analytical expressions for the general case of any number of relays, which are validated by means of Monte Carlo simulations. or improving PU's transmission by applying sophisticated signal processing and coding. In the interweave approach, SU utilizes the spectrum not currently being used by PU.A number of transmission schemes for CRN have emerged in literature. In particular, to improve the spatial diversity order, the technique of relaying has been introduced into CRN. Authors in [6-9] considered one-relay scenario, and authors in [10-13] considered multi-relay scenario, where in the latter only one appropriate relay node is selected to forward the received signals. However, in [14], multiple relays may be selected to forward SU's signals, and SU does not know which and how many secondary relays will be selected and participate in the second phase. In these papers, [7][8][9][10]12] analyzed the performance when considering the interference from PU to SU, and [12] is the first paper analyzing the outage probability in underlay cognitive networks with multiple relays when considering this interference.In the aforementioned works, that is, [6][7][8][9][10][11][12][13], the relays are only deployed for secondary transmission. Nevertheless, some other papers discussed the case when the relays may assist the primary or/and secondary transmission. In [15][16][17], the relays would forward PU's or SU's message depending on the decoding status in the first phase. In [18][19][20], a relay node could help simultaneously the primary and the secondary transmissions. Actually, primary system stands for the existing communication systems, which have been studied widely when deployed with multiple relays. All what we can do is the designs based on the existing framework; thus, it is reasonable to investigate the CRN when relays are deployed mainly for primary transmission. When the resources at the relays are redundant for primary system, the relays might also be used for secondary transmission on the premise that this operation would n...

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Section: System Modelmentioning

confidence: 99%

mentioning

confidence: 99%

Outage performance of cognitive radio networks with multiple decode‐and‐forward relays

Wang

Lin

et al. 2016

Int J Communication

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“…The problem of optimal transmission in underlay cognitive radio networks, under various combinations of average or peak transmit and/or interference power constraints, have been studied in [7]- [10]. Optimal transmission schemes to maximize the ergodic rates are reported in [7], [9], [10], while [8] presents some limited analytical results on delaylimited and outage capacities obtained by ignoring the primary interference and transmit power constraints, and subject to maximum interference constraints only.…”

Section: Outage Analysis For Underlay Cognitive Transmissionmentioning

confidence: 99%

“…Optimal transmission schemes to maximize the ergodic rates are reported in [7], [9], [10], while [8] presents some limited analytical results on delaylimited and outage capacities obtained by ignoring the primary interference and transmit power constraints, and subject to maximum interference constraints only. To protect the primary transmission, the secondary transmission is subject to a peak interference constraint at the primary receiver:…”

Section: Outage Analysis For Underlay Cognitive Transmissionmentioning

confidence: 99%

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Distortion-aware transmission in cognitive radio networks

Chatterjee

Oyman

Foerster

2010

2010 Conference Record of the Forty Fourth Asilomar Conference on Signals, Systems and Computers

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One of the primary design goals of wireless multimedia communication systems is to optimize the quality of user experience. This metric is often quantified using the end-to-end distortion between the original source at the encoder and the reconstructed version of it at the destination. Considering this performance metric, optimal multimedia transmission schemes using joint source-channel coding (JSCC) for fading cognitive radio networks are studied in this paper. Different underlay transmission protocols, based on single-or multi-user receiver capabilities, are compared in terms of their average distortion performance, using an outage analysis. It is demonstrated that JSCC provides significant performance gains over goodputmaximizing schemes that rely on the optimality of sourcechannel separation, and that, for the scenarios evaluated, one of the proposed protocols with JSCC achieves average distortion performance very close to a lower bound obtained by ignoring the primary interference. I. INTRODUCTIONThe scarcity of bandwidth for next-generation wireless communication systems necessitates new multi-user system designs to increase the wireless capacity, especially for communicating high-bandwidth multimedia content such as video. Cognitive radios have a considerable potential in enhancing spectrum utilization by facilitating intelligent co-existence of primary (or legacy) and secondary (or cognitive) user-pairs over the same resources [1]. Different designs for cognitive radio networks have been proposed in the literature. These designs vary significantly from each other based on complexity, underlying assumptions, and performance aspects. Here, we study the problem of multimedia communication over underlay cognitive radio networks. According to the underlay paradigm, the secondary user-pair communicates simultaneously over the same band as the primary user-pair while satisfying a suitable interference power constraint at the primary destination for all channel conditions. Wireless communication of multimedia generally involves transmission of a continuous source over fading channels subject to end-to-end distortion and delay requirements. In this regard, JSCC aims at optimizing source compression and channel coding to minimize end-to-end distortion by simultaneously accounting for the impact of source quantization errors, channel-induced packet errors and network congestion caused by latency, jitter, buffer overflows, etc. Depending on the exact multi-user scenario [2], the fading model, delay constraints, and the availability of channel state information

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BER Performance of Walsh Hadamard Like Codes Based on Complementary Sequence Sets in a CDMA and Cognitive Underlay System

Suchitra¹,

Valarmathi²

2012

Wireless Pers Commun

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Underlay Cognitive Radio with Full or Partial Channel Quality Information

Cited by 14 publications

References 18 publications

Outage performance of cognitive radio networks with multiple decode‐and‐forward relays

Outage performance of cognitive radio networks with multiple decode‐and‐forward relays

Distortion-aware transmission in cognitive radio networks

BER Performance of Walsh Hadamard Like Codes Based on Complementary Sequence Sets in a CDMA and Cognitive Underlay System

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