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008 030926s2002 th u m rtt 00| a1eng d
035 _a.b11900350
099 9 _aAIT Thesis no.TC-02-19
100 0 _aParames Foomooljareon
245 1 4 _aThe peak to average power ratio reduction in OFDM systems
260 _aBangkok :
_bAsian Institute of Technology,
_c2002
300 _a58 leaves
490 1 _aThesis ;
_vno. TC-02-19
500 _aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology
502 _aThesis (M.Eng.) - Asian Institute of Technology, 2002
520 _aOrthogonal Frequency Division Multiplexing or OFDM is a form of multi-carrier modulation technique. High spectral efficiency, robustness to channel fading, immunity to impulse interference, uniform average spectral density, capability of handling very strong echoes and less non linear distortion are among the favorite properties of OFDM. Even though there are many advantages of OFDM, it has two main drawbacks: high Peak to Average Power Ratio (PAPR) and frequency offset. In this thesis, the issue of PAPR reduction in OFDM is discussed. The effect of modulation schemes on PAPR is illustrated at the beginning of the thesis. Two new algorithms are proposed to reduce the PAPR. The first algorithm, Lookup Table Approach, is carried out by selecting the input sequences properly using a lookup table. The second algorithm, Envelope Scaling Approach, is to scale the input envelope for some subcarriers before they are transformed to the time domain by Inverse Fast Fourier Transform (IFFT). Simulation results show that PAPR can be reduced significantly with both schemes. The BER performance for multipath fading channel of the proposed schemes is insignificantly different when comparing to adaptive Partial Transmitted Sequence (PTS). The costs of the proposed schemes are information rate in the Lookup Table approach and the complexity in the Envelope Scaling Approach respectively.
650 0 _aCoding theory
650 0 _aModulation theory
700 1 _aFernando, W.A.C.,
_eChairperson
700 1 _aAhmed, Kazi Mohiuddin,
_eExamination Committee
700 1 _aErke, Tapio J.,
_eExamination Committee
710 2 _aRoyal Thai government Fellowship,
_eScholarship donor
710 2 _aAdvance Info Service Plc.,
_eScholarship donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. TC-02-19
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B07581
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