8470

7851

كارشناسي ارشد

مخابرات

اصفهان: دانشگاه صنعتي اصفهان، دانشكده برق و كامپيوتر

1392

[هشت]، 93ص: مصور،جدول، نمودار

ص.ع.به فارسي و انگليسي

مهدي مهدوي

7/11/92

محمدصادق فاضل، نغمه السادات مويديان

مهندسي برق و كامپيوتر

ID7851

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

A Novel Scheduling Algorithm for WiMAX Network according IEEE 802 16j Amirabbas Modir Amir modir2000@ec iut ac ir Date of Submission 2013 04 26 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor m mahdavi@cc iut ac irAbstract To increase use of the wireless communication systems for high data rate and QOS of multimedia WiMAX network has been designed WiMAX uses the Orthogonal Frequency Division Multiple Access OFDMA in physical layer Researches show that OFDMA slots in scheduling algorithms structure aremade by two methods Contiguous Permutation Subcarriers AMC mode and Diversity PermutationSubcarriers PUSC mode OFDMA system leads to high data rate Also WiMAX network to coverage largearea uses of relays system QoS and the capacity of network are most important subjects in wireless systems In WiMAX communication system we attempt to provide both QoS and high capacity Hence thescheduling and resource allocation algorithms are important matter for approaching them In WiMAXnetwork there are two methods that named AMC Adaptive Modulation and Coding and PUSC PartialUsage of Sub channel AMC mode algorithm is used for high capacity since we are in low speed and PUSCmode algorithm is used for high capacity since we are in high speed Users move in different speed innetworks So we should use both AMC and PUSC modes for increasing capacity of WiMAX network Todays both of AMC and PUSC methods are used simultaneously but we try to use the AMC mode for highcapacity WiMAX network in high speed This paper proposes a new frame structure that uses the both AMCmode and PUSC mode and in this new frame structure high speed users also utilize the AMC mode Scheduler allocates slots to users in the way that channel coherence time become larger than or equal to thetime length of adjacent slots The simulation results show that our algorithm presents more capacity and lesspacket delay and packet loss rate in comparison other similar algorithms Key words scheduling algorithm PUSC AMC mode High and low mobility speed Resource allocation

مهدي مهدوي

محمدصادق فاضل، نغمه السادات مويديان