BER performance of MC-DS-CDMA systems in the presence of timing jitter : a thesis presented in partial fulfillment of the requirements for the degree of Master of Engineering in Information and Telecommunication Engineering at Massey University, Palmerston North, New Zealand
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Date
2010
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Massey University
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Abstract
Multi-carrier direct-sequence code division multiple access (MC-DS-CDMA)
technique, which is a combination of orthogonal frequency-division multiplexing
(OFDM) and code division multiple accesses (CDMA), has been considered as an
important technique for the future generation wireless systems due to its bandwidth
efficiency, frequency diversity, and immunity to channel dispersion. OFDM has
already been employed in many areas, such as digital audio and video broadcasting,
wireless local/metropolitan area networks, and asynchronous digital subscriber lines
(ADSL). Leveraging the multiple access capability of CDMA, the MC-DS-CDMA
technique is an important enhancement to OFDM.
Nevertheless, a major disadvantage of the MC-DS-CDMA systems is their high
sensitivity to timing errors between transmitter and receiver due to the use of a large
number of carriers and the superposition of signals of multiple users. In this thesis,
we study the bit error rate (BER) performance of MC-DS-CDMA system under the
effects of timing jitter in additive white Gaussian noise (AWGN) channel and
multi-path Rayleigh fading channel, respectively. In particular, we have derived
the analytical BER expressions for the MC-DS-CDMA signals in presence of white
or colored timing jitters and verified the results via computer simulations.
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Keywords
Multiplexing, Wireless communication systems, OFDM, Wireless networks, Bit error rate, Additive white Gaussian noise (AWGN)