Since direct-sequence code-division multiple-access
(DS-CDMA) is an interference-limited random multiple-access
scheme, the reduction of co-channel interference with either
interference suppression or interference cancellation multiuser
receivers and/or power control to prevent detrimental near-far
situations is vital for improved performance. Up to date, some
contributions investigated randomly-spread asymptotically - large
number of users and large bandwidth - large CDMA systems with
multiuser receivers and power control via random matrix theoretic
and free probability theoretic tools especially over Gaussian and
single-path fading channels. As complement within this thesis, we
analyze also within the generalized random spreading framework but
at finite system sizes and without power control the capacity
achievable with linear multichannel multiuser receivers / i.e.
RAKE, zero-forcing decorrelator, linear minimum mean-squared error
(LMMSE) multiuser receivers, within a single-cell setting over
generalized time-varying GWSSUS - Rayleigh/Ricean - fading
channels via random matrix theoretic tools. Assuming maximal-ratio
combining (MRC) of resolved frequency - multipath - diversity
channels due to wideband transmission, the signal-to-interference
ratios (SIRs) with multichannel multiuser receivers that set the
basis for further derivations are statistically characterized. The
information-theoretic ergodic and outage sum-rates spectral
efficiencies are then derived and analyzed.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12607022/index.pdf |
| Date | 01 December 2005 |
| Creators | Ertug, Ozgur |
| Contributors | Baykal, Buyurman |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | Ph.D. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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