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Rate detection for variable-rate data transmission in CDMA communication systems Yang, Gordon
Abstract
Variable-rate data transmission is one of the key techniques to effectively reduce the mutual interference and as a result increase the link capacity in direct sequence code division multiple access (DS-CDMA) systems. To avoid frame overhead, a blind rate detection scheme that does not explicitly transmit any rate information of transmitted data has been proposed for use in the third-generation DS-CDMA cellular communication systems. In this thesis, a novel joint rate detection and data decoding algorithm (JRDDDA) for variable-rate data transmission in DS-CDMA systems is proposed. Its performance in terms of frame error rate and false rate detection rate is investigated by means of computer simulation in three different, standard channels; namely, the additive white Gaussian noise channel, the frequency-flat Rayleigh fading channel, and the frequency-selective Rayleigh fading channel. The effect of channel estimation error on the system performance is also investigated in the considered channels. Moreover, a novel joint source and channel coding based rate detection algorithm (JSCCRDA) is proposed, which exploits rate sequence redundancy for combating the effect of the noisy channels. A first-order Markov process is used to model the rate sequence from the vocoder's output in the case of voice transmission. An instantaneous Maximum a posteriori algorithm is employed in our joint source and channel decoder due to the delay constraint on real-time cellular communication systems. The proposed JSCC-RDA is applied to two well-known rate detection algorithms and the JRDDDA as well for performance improvement in terms of false rate detection rate.
Item Metadata
Title |
Rate detection for variable-rate data transmission in CDMA communication systems
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
2001
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Description |
Variable-rate data transmission is one of the key techniques to effectively reduce the
mutual interference and as a result increase the link capacity in direct sequence code division
multiple access (DS-CDMA) systems. To avoid frame overhead, a blind rate detection scheme
that does not explicitly transmit any rate information of transmitted data has been proposed for
use in the third-generation DS-CDMA cellular communication systems. In this thesis, a novel
joint rate detection and data decoding algorithm (JRDDDA) for variable-rate data transmission in
DS-CDMA systems is proposed. Its performance in terms of frame error rate and false rate
detection rate is investigated by means of computer simulation in three different, standard
channels; namely, the additive white Gaussian noise channel, the frequency-flat Rayleigh fading
channel, and the frequency-selective Rayleigh fading channel. The effect of channel estimation
error on the system performance is also investigated in the considered channels.
Moreover, a novel joint source and channel coding based rate detection algorithm (JSCCRDA)
is proposed, which exploits rate sequence redundancy for combating the effect of the noisy
channels. A first-order Markov process is used to model the rate sequence from the vocoder's
output in the case of voice transmission. An instantaneous Maximum a posteriori algorithm is
employed in our joint source and channel decoder due to the delay constraint on real-time cellular
communication systems. The proposed JSCC-RDA is applied to two well-known rate detection
algorithms and the JRDDDA as well for performance improvement in terms of false rate
detection rate.
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Extent |
7259767 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-10-09
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0065362
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
2001-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.