بيشينه‌سازي گذردهي در شبكه‌هاي مخابراتي مبتني بر ارسال توان بيسيم

چكيده انگليسي :

Throughput Maximization in Wireless Powered Communication Networks Omid Rezaei omid rezaei@ec iut ac ir August 29 2018 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Dr Mohammad Mahdi Naghsh mmnaghsh@cc iut ac ir Advisor Dr Maryam Masjedi m masjedi@pd iut ac ir Abstract The lifetime of the conventional energy constrained wireless networks is limited by the operational time of batteriesof the wireless communication devices The network lifetime can be enhanced by employing recent advances in wirelesspower transfer WPT technology in which the wireless devices are powered by continuous uninterrupted energy fromdedicated wireless power transmitters One of the important applications of WPT is wireless powered communicationnetworks WPCN where the wireless devices are powered by the wireless energy in the downlink phase in order to transferinformation in the uplink phase In this thesis two new system model is presented for WPCN The first system model studies a general multi user wirelesspowered interference channel IFC where the communication in channel coherence time consists of two phases namelywireless energy transfer WET and wireless information transfer WIT In the first phase all energy transmitters ETs transmit energy signals to information transmitters ITs via collaborative waveform design while in the second phase eachIT transmits an information signal to its intended ET using the harvested energy in the previous phase The aim is to jointlydesign the WET WIT time allocation the deterministic transmit signal at the first phase and the transmit power of ITs inthe second phase to optimize the network throughput We consider the uncertainty in the channel state information CSI and devise a robust design methodology against imperfect CSI for both sum and minimum throughput maximizations In the second system model a new K link cooperative WPCN is studied In this model the HAP broadcasts wirelessenergy to 2K users in the downlink and the users transmit their independent information to the HAP in the uplink Wepropose a user cooperation method in the WPCN where the users which are nearer to the HAP and have a better channelsfor downlink energy harvesting as well as uplink information transmission use part of their allocated uplink time anddownlink harvested energy to help to relay the far user s informations to the HAP in order to achieve more throughput Inthis model in addition to designing the energy beamforming matrix in downlink we further consider the transmit covariancematrices in uplink as well as the time allocation parameters as design variables to optimize the maxmin fair problem The design problems for both models are non convex and hence difficult to solve globally To deal with them wepropose efficient iterative algorithms based on alternating projections then the majorization minimization technique is usedto tackle the non convex sub problems in each iteration The proposed algorithms are locally convergent providing qualitysolutions to the design problems Simulation results show the effectiveness of the proposed algorithms under various setups Key Words Cooperative Communication Interference Channel Waveform Design Wireless Pow ered Communication Networks

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بيشينه‌سازي گذردهي در شبكه‌هاي مخابراتي مبتني بر ارسال توان بيسيم

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