Has fairly complex implementation, and share with the first scheme the fact that both do not support multi-user access in this thesis, a novel transmission scheme is developed to effectively enable multiple access by joint code design across multiple antennas, subcarriers, ofdm frames, and users such system will benefit. An improved channel estimation approach for mimo-ofdm systems zhen lu a thesis submitted in fulfillment of requirements for the degree of master of engineering (research) centre for real time information technology faculty of engineering and information technology university of technology, sydney sydney. Resource allocation and scheduling in the downlink of ofdma networks supporting heterogeneous traffic will be considered in this thesis the purpose of resource alloca- tion is to allocate sub-carriers and power to users to meet their service requirements while maintaining fairness among users and maximizes resource. Interest in applying ofdm techniques for optical communications this thesis presents extensive research on optical ofdm and how it is being applied in access networks with the aid of theoretical analysis, simulations and experiments, it is shown that the system performance of direct-detection optical. Ofdma orthogonal frequency division multiple access ofdm orthogonal frequency-division multiplexing pas power amplifiers papr peak to average power master's thesis: throughput optimization and energy efficiency of the downlink in the lte system supervisor: professor mohammed elmusrati instructor. On the way towards providing gigabytes transmission, incorporation of ofdma and relays is foreseen to offer a promising network infrastructure this thesis concentrates on how to improve the spectrum efficiency and energy efficiency of cooperative relay-assisted ofdma wireless networks first, various. Channel estimation and prediction for mimo ofdm systems: key design and performance aspects of kalman-based algorithms daniel aronsson phd thesis, uppsala university, isbn 978-91-506-2194-5, february 2011, 245 pp dissertation in engineering science with specialization in signal processing, publicly. The objectives of the thesis are of two fields firstly, we presented the frequency offset estimation algorithms for ofdm systems building our work upon the classic single user ofdm architecture, we proposed two fft-based frequency offset estimation algorithms with low computational complexity the computer simulation.
12 objective: the objective of our thesis is proposing a new radix-22 algorithm and its utilization in ofdm based communication system the modified ofdm communication system has been implemented and the fixed wimax and mobile wimax systems are redesigned for better results the design has been done in. This thesis consists of a prologue and six parts that address two aspects of orthogonal frequency-division multiplexing (ofdm) communication systems: synchronization and channel estimation for the synchronization aspect, focus is on estimators of time and frequency offsets that exploit the cyclic prefix. The ofdm applied to optical systems has been studied recently concluding that it is an appropriate solution to the chromatic dispersion, the most stringent impairment in single mode optical systems this master thesis presents a study of optical ofdm techniques applied to optical networks from the many different.
Phd thesis contributions to lte implementation 7 figure 25: protocol layers in lte-uu (between ue and e-nb) let's examine the lte-uu control plane protocol the physical (phy) layer in lte supports the following functions : - hybrid automatic repeat request (harq) with soft combining - ofdma-based. Master thesis written report title: study comparison of wcdma and ofdm by: moyamer chowdhury (800101-p116) & aminul alam (790502-p130) students of the master program in electrical engineering examiner and adviser: mr tommy hult 1. Therefore, a combination of sophisticated transmission techniques (eg, ofdma) and proper packet scheduling algorithms is necessary, in order to provide applications with suitable quality of service this thesis addresses the problem of traffic scheduling in point-to-multipoint ofdma-based systems we formally prove.
The contributions introduced in this thesis are illustrated in figure 14 in detail, we perform an analysis of ofdma/lte systems operating in interference limited scenarios and employing proportional fair (pf) scheduling in the analysis we first characterize the signal-to-interference-noise-ratio (sinr) distribution and then. Ofdma broadband wireless networks research thesis submitted in partial fulfillment of the requirements for the degree of doctor of philosophy guy grebla submitted to the senate of the technion — israel institute of technology shevat 5773 haifa february 2013 technion - computer science department - phd.
Becomes even more challenging in the uplink ofdma based systems where one transmission symbol is generated by the contribution of different users our goals in this thesis include the study and analysis of problems resulting from frequency mismatches and to provide solutions to combat these. Allocation topic in fd systems and discuss the research objectives of this thesis 12 literature review in this section, we will review current work on the topic of resource allocation for orthogonal frequency division multiplexing (ofdm) and orthogonal frequency division multiple access (ofdma) networks for both hd and.
Increase in capacity of multiuser ofdm system using dynamic sub-channel allocation real time channel estimation for ofdm system with almouti stbc adaptive resource allocation in multiuser ofdm systems with proportional rate constraints capacity of ofdm-based spatial multiplexing system. This is to certify that the work presented in this dissertation entitled “on efficient signal processing algorithms for signal detection and papr reduction in ofdm systems by “prasanta kumar pradhan, roll number 508ec102, is a record of original research carried out by him under my supervision and. Therefore, in this thesis, we will first look into the interference caused by cfo in rf based ofdma system and will analyze the characteristics of this interference for two mapping subcarrier strategies we will explicitly calculate sinr expression for ofdma based systems and analyze two types of symbol mapping strategies. Results are available on the impact of interference on ofdma communications in this thesis, we study the behaviour of an ofdma system with respect to the inter- cell interference we show that due to the heterogeneous nature of the interfer- ence, interference estimation combined with soft-input channel decoders can be.
Upstream ofdma signals a thesis submitted to the college of graduate studies and research in partial fulfillment of the requirements for the degree of master of science in the department of electrical and computer engineering university of saskatchewan by yayi xiao saskatoon, saskatchewan, canada. Frequency offsets in ofdm introduce intercarrier interference (ici) channel estimations are also required this thesis focuses on the channel and frequency offset estimation for ofdm- based systems for cooperative-relay ofdm with frequency offsets, where inter-relay interference (iri) exists, channel estimation is. Radio resource management in ofdma-based cellular relay networks mohamed salem, bsc, msc a thesis submitted to the faculty of graduate and postdoctoral affairs in partial fulfillment of the requirements for the degree of doctor of philosophy in electrical engineering ottawa-carleton institute for electrical and. Interface technologies the thesis cover a simulation of an orthogonal frequency division multi access (ofdma) cellular radio system using matlab m-files the transmitter and receiver accommodate orthogonal divison multiplexing (ofdm) as a modulation scheme the obtained result cover performance study of the system.