Please use this identifier to cite or link to this item:
DC FieldValue
dc.titleDifferentially-encoded di-symbol time-division multiuser impulse radio in UWB channel
dc.contributor.authorZHANG QI
dc.identifier.citationZHANG QI (2007-09-10). Differentially-encoded di-symbol time-division multiuser impulse radio in UWB channel. ScholarBank@NUS Repository.
dc.description.abstractIn this thesis, we proposed a differentially-encoded, di-symbol time-division multiuser impulse radio (d2TD-IR) system. Two time-hopping access sequences, which alternately encode the odd- and even-index symbols, are employed with delay-sum autocorrelation receivers to maximally suppress multiuser interference and channel noise. It was shown that when the chip duration is properly chosen, the proposed system outperforms the conventional time-hopping impulse radio system at high signal-to-noise ratio. This thesis also proposed a method to estimate the optimal chip duration when only the average power decay profile of the ultrawide-band channel is known. The proposed d2TD-IR system assumes perfect synchronization among users. To complete the system, we proposed a recursive algorithm which combines synchronization and power control. To further enhance system performance, we also examined the effects of low-density parity-check (LDPC) and LDPC product codes on the d2TD-IR system. Finally, the single-input single-output d2TD-IR was extended to a differential space-time coded multiple-input-multiple-output system.
dc.subjectultrawide-band, impulse radio, transmitted-reference, autocorrelation receiver, TDMA, differential space-time coding
dc.contributor.departmentELECTRICAL & COMPUTER ENGINEERING
dc.contributor.supervisorNG CHUN SUM
dc.contributor.supervisorYEO TAT SOON
dc.description.degreeconferredDOCTOR OF PHILOSOPHY
Appears in Collections:Ph.D Theses (Open)

Show simple item record
Files in This Item:
File Description SizeFormatAccess SettingsVersion 
Zhang Qi_PhD_Thesis_Electrical and Computer Engineering_2007.pdf1.36 MBAdobe PDF



Page view(s)

checked on May 22, 2019


checked on May 22, 2019

Google ScholarTM


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.