Ergodic capacity of spectrum sharing cognitive radio with MRC diversity and Nakagami fading

Blagojević, Vesna; Ivaniš, Predrag

doi:10.1109/wcnc.2012.6214277

Cited by 14 publications

(7 citation statements)

References 11 publications

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“…Obtaining the CSI of links between SUs and PU in the cognitive radio systems is an important issue. In many earlier research works in the literature, [13][14][15][16][17][18][21][22][23] it has been assumed that SUs have the CSI knowledge links between SUs and PU. However, in some other works, eg, Gong et al 24 and Ropokis et al, 25 it was assumed that SUs know only statistical properties of SUs → PU links.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of multiuser selection diversity in SIMO spectrum sharing systems

Aghazadeh

Torabi

2017

Int J Communication

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SummaryIn this paper, a performance analysis is presented for user selection schemes in a single-input multiple-output spectrum sharing system. In the considered system, multiple secondary users try to use the licensed spectrum of a primary user in an opportunistic manner, in which an interference constraint for the primary user is satisfied. In this paper, we first use 2 conventional user selection schemes for single-input multiple-output spectrum sharing system and analyze the system performance for each scheme. We then propose a new user selection scheme that can overcome the limitations of those 2 conventional user selection schemes. As for the performance analysis, the average channel capacity, the outage probability, and the bit error rate performances of the system using the presented user selection schemes are analyzed and mathematical closed-form expressions for the outage probability are derived. The performances of the system are evaluated using the derived mathematical formulas in different cases. In addition, Monte Carlo simulation results are also provided to show the accuracy and correctness of the performed analysis.

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Section: Introductionmentioning

confidence: 99%

Performance analysis of multiuser selection diversity in SIMO spectrum sharing systems

Aghazadeh

Torabi

2017

Int J Communication

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“…In a round of data transmission, only one cognitive source or destination is selected for communications. For cognitive MIMO systems, the works can be found in . Specially, the works and analysed the capacity of secondary link under the case where the systems have the perfect or imperfect channel state information (CSI) concerning secondary links, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…As a realistic consideration, in , a peak power transmission constraint in addition to peak interference power constraint was considered. The cognitive MIMO systems were investigated over Nakagami‐ m fading in .…”

Section: Introductionmentioning

confidence: 99%

“…Although the works showed that the CR systems benefit greatly from the utilisation of multiple antenna, as pointed out by Khan et al in and , the increase of antennas at terminals also has its drawback. This is because, for each additional antenna element, a new radio‐frequency chain at source and a complicated signal processing at receiver are also needed.…”

Section: Introductionmentioning

confidence: 99%

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Outage performance and ergodic capacity of multiuser cognitive MIMO AF relaying systems with MUS/MRT/RAS over Nakagami‐m fading channels

Jia

Xie

Yang

et al. 2015

Trans. Emerging Tel. Tech.

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To improve the performance of cognitive spectrum‐sharing systems and to reduce the implementation complexity of multiple antenna systems, a cognitive multiple‐input multiple‐output (MIMO) amplify‐and‐forward relay cooperation (C‐MIMO AF‐RC) multiuser system is considered over Nakagami‐m fading channels by integrating maximum ratio transmission (MRT), multiuser selection (MUS) and receive antenna selection (RAS) techniques. In the C‐MIMO AF‐RC multiuser systems, all secondary users (SUs) are equipped with multiple antennas while the primary users (PUs), single antenna. The interested cognitive systems are investigated under the case where the systems have perfect or imperfect channel state information (CSI) of both the SUs–SUs and SUs–PUs links so that the effect of outdated CSI can be achieved. Specially, we first obtain the exact closed‐form expressions of the cumulative distribution function of end‐to‐end signal‐to‐noise ratio. Secondly, we perform a comprehensive comparison investigation on outage probability and ergodic capacity. Specially, based on moment generating function, the exact closed‐form expression of ergodic capacity is achieved. Finally, to highlight the insight of the effect of key system parameters, the high signal‐to‐noise ratio asymptotic analysis of outage probability is performed as well as diversity and coding gains, by considering the two cases where the systems have perfect or imperfect CSI of both the SUs–SUs and SUs–PUs links. The derivations clearly show that the CSI concerning SUs–PUs links only affects the coding gain, but not the diversity order. However, the CSI concerning the SUs–SUs links plays a key role on the achievable diversity order. In particular, when the CSI of SUs–SUs links is perfect, the C‐MIMO AF‐RC multiuser systems achieve the full diversity including not only MRT diversity but also MUS and RAS diversities. In contrast, when the CSI concerning secondary links is outdated, the MUS and RAS diversities disappear, and the MUS and RAS only improve coding gain. The remaining diversity is achieved through MRT.

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“…In [3], the analysis is extended to the case when transmit power constraint of the SU transmitter (SU-Tx) is also considered. The analysis of spectrum sharing system with Nakagami distributed fading in both links from SU-Tx to the secondary receiver (SU-Rx), and from SU-Tx to the PU-Rx is provided in [4] and [5]. However, the interference from the primary transmitter (PU-Tx) to the SU-Rx is ignored in all above mentioned papers.…”

Section: Introductionmentioning

confidence: 99%

Outage Probability of SINR for Underlay Cognitive Radio Systems in Nakagami Fading

2014

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In this paper underlay cognitive radio system is analyzed in Nakagami fading environment, for the case when the available channel state information (CSI) of the link from the secondary transmitter to the primary receiver is outdated. We considered the case when both interference and transmit power constraints are applied. The impact of the co-channel interference that originates from the primary user is analyzed in details. The exact closed-form expressions for probability density function, outage probability, and the moments of signal-tointerference and noise ratio (SINR) at the secondary user's receiver are derived. The analytical expressions are verified by using independent Monte Carlo simulation method.

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Ergodic capacity of spectrum sharing cognitive radio with MRC diversity and Nakagami fading

Cited by 14 publications

References 11 publications

Performance analysis of multiuser selection diversity in SIMO spectrum sharing systems

Performance analysis of multiuser selection diversity in SIMO spectrum sharing systems

Outage performance and ergodic capacity of multiuser cognitive MIMO AF relaying systems with MUS/MRT/RAS over Nakagami‐m fading channels

Outage Probability of SINR for Underlay Cognitive Radio Systems in Nakagami Fading

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