Analytic models for the performance of the forward link of 3G CDMA
systems using different maximum ratio combining (MRC) RAKE finger
weight assignments are presented. The spreading modulations under
investigation are the balanced QPSK and the complex-spreading QPSK.
The models are computationally efficient, accurate, and
applicable to Root Raised Cosine (RRC) pulse shaping with any
roll-off factor, variable processing gain, chip rate, and data
rate for orthogonal codes, random codes, quasi-orthogonal codes,
Gaussian noise, and realistic channel models. The expressions
derived are then used to obtain the so-called orthogonality
factor, which is commonly used in system-level simulations.
Next, closed-form mathematical expressions for the variance due to
infinite chips interfering in systems using arbitrary Nyquist
pulses are derived. These expressions are applicable to both the
forward link and the reverse link. For the latter, the existing
knowledge on the accurate and efficient estimation of the
performance of CDMA systems is extended by presenting closed
mathematical expressions for bandlimited systems using arbitrary
Nyquist pulses for both BPSK and Offset-QPSK (OQPSK)
modulation. The impact
of adjacent channel interference in bandlimited systems is
subsequently considered. Finally, mathematical expressions for the
accurate and efficient estimation of a CDMA system using RRC
pulse-shaping and a RAKE receiver in the presence of multipath
interference are presented.
| Identifer | oai:union.ndltd.org:GATECH/oai:smartech.gatech.edu:1853/5212 |
| Date | 12 April 2004 |
| Creators | Jatunov, Loran Aleksandrovich |
| Publisher | Georgia Institute of Technology |
| Source Sets | Georgia Tech Electronic Thesis and Dissertation Archive |
| Language | en_US |
| Detected Language | English |
| Type | Dissertation |
| Format | 1486435 bytes, application/pdf |
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