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RISS 인기검색어
- 검색키워드
- 저자 : Salman Durrani (검색결과 3 건)
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Islam, Shama N.,Durrani, Salman,Sadeghi, Parastoo The Korea Institute of Information and Commucation 2016 Journal of communications and networks Vol.18 No.5
Multi-way relay networks (MWRNs) allow multiple users to exchange information with each other through a single relay terminal. MWRNs are often incorporated with capacity achieving lattice codes to enable the benefits of high-rate signal constellations to be extracted. In this paper, we analytically characterize the symbol error rate (SER) performance of a functional decode and forward (FDF) MWRN in the presence of channel estimation errors. Considering M-ary quadrature amplitude modulation (QAM) with square constellations as an important special case of lattice codes, we obtain asymptotic expressions for the average SER for a user in FDF MWRN. The accuracy of the analysis at high signal-to-noise ratio is validated by comparison with the simulation results. The analysis shows that when a user decodes other users with better channel conditions than itself, the decoding user experiences better error performance. The analytical results allow system designers to accurately assess the non-trivial impact of channel estimation errors and the users' channel conditions on the SER performance of a FDF MWRN with M-QAM modulation.
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Shama N. Islam,Salman Durrani,Parastoo Sadeghi 한국통신학회 2016 Journal of communications and networks Vol.18 No.5
Multi-way relay networks (MWRNs) allow multiple usersto exchange information with each other through a single relayterminal. MWRNs are often incorporated with capacity achiev-ing lattice codes to enable the benefits of high-rate signal constel-lations to be extracted. In this paper, we analytically character-ize the symbol error rate (SER) performance of a functional de-code and forward (FDF) MWRN in the presence of channel esti-mation errors. ConsideringM-ary quadrature amplitudemodula-tion (QAM) with square constellations as an important special caseof lattice codes, we obtain asymptotic expressions for the averageSER for a user in FDF MWRN. The accuracy of the analysis athigh signal-to-noise ratio is validated by comparison with the sim-ulation results. The analysis shows that when a user decodes otherusers with better channel conditions than itself, the decoding userexperiences better error performance. The analytical results al-low system designers to accurately assess the non-trivial impact ofchannel estimation errors and the users’ channel conditions on theSER performance of a FDF MWRN withM-QAM modulation.
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Path-Following Algorithms for Beamforming and Signal Splitting in RF Energy Harvesting Networks
Nasir, Ali A.,Tuan, Hoang D.,Ngo, Duy T.,Durrani, Salman,Kim, Dong In IEEE 2016 IEEE COMMUNICATIONS LETTERS Vol.20 No.8
<P>We consider the joint design of transmit beamforming and receive signal-splitting ratios in the down-link of a wireless network with simultaneous radio frequency information and energy transfer. Under constraints on the signal-to-interference-plus-noise ratio at each user and the total transmit power at the base station, the design objective is to maximize either the sum harvested energy or the minimum harvested energy. We develop a computationally efficient path-following method to solve these challenging nonconvex optimization problems. We mathematically show that the proposed algorithms iteratively progress and converge to locally optimal solutions. Simulation results further show that these locally optimal solutions are the same as the globally optimal solutions for the considered practical network settings.</P>
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