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035 _a.b11492879
099 9 _aAIT Thesis no.TC-95-7
100 1 _aHan, Wei
245 1 4 _aThe application of multirate techniques for synchronization in fully digital demodulation
260 _aBangkok :
_bAsian Institute of Technology,
_c1995
300 _a66 leaves :
_bill.
490 1 _aThesis ;
_vno. TC-95-7
502 _aThesis (M.Eng.) - Asian Institute of Technology, 1995
500 _aA thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering.
520 _aThis study presents an multirate technique as a timing recovery scheme for digital cellular mobile systems in the digital signal processing environment. n/4-shifted-DQPSK modulation is used according to the North American IS-54 TDMA frame structure. The feasibility of the application of square in-phase and quadrature (SIQ) signal phases as a timing recovery detection signal and their BER performances in fading channels corrupted by CCI and A WGN, are investigated in MATLAB. The phase searching processor is a unit that can extract the appropriate timing instant by comparing the SIQ signal phase with the reference signal phase. The phase adjuster, which is employed to diminish phase distortion caused by fading channel, is used to implement synchronizer design. Its BER performance is measured and compared with the expected performance under various operating conditions, such as two rays Rayleigh fading channel or six bins channel based on the GSM specification, and with interferer from varying power.
650 1 0 _aCellular radio
700 1 _aMakelainen, Kimmo,
_eChairperson
700 1 _aAhmed, Kazi Mohiuddin,
_eExamination Committee
700 1 _aZhang, Jian-Guo,
_eExamination committee
710 2 _aGovernment of Japan,
_eScholarship donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. TC-95-7
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B15298
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