Title page for ETD etd-02132009-172635
|Type of Document
||An adaptive multistage interference cancellation receiver for CDMA
||Master of Science
|Woerner, Brian D.
|Rappaport, Theodore S.
|Reed, Jeffrey Hugh
|Date of Defense
Most of the previous research on multistage interference cancellation receivers for Code
Division Multiple Access (CDMA) systems has relied on the use of simulation techniques
for performance evaluation. This thesis formulates a model for an adaptive multistage
interference cancellation receiver within a CDMA system to be employed at the cellular
radio base station. A closed form expression for the probability of bit error for this
adaptive multistage interference cancellation receiver is derived, using a Gaussian
approximation for Multiple Access Interference (MAI). The Bit Error Rate (BER) after
any stage of interference cancellation can be computed from the signal to noise ratio,
number of users and processing gain of the CDMA system. The BER expressions are
extended to derive asymptotic limits on the performance of interference cancellation as
the number of cancellation stages approaches infinity, demonstrating a fundamental limit
on the performance improvement that can be expected from any multistage interference
cancellation scheme. Furthermore, the analysis quantifies conditions under which
interference cancellation may degrade performance.
This thesis also extends a software implementation of the Multistage Rake receiver for a
wide range of channel models including Gaussian noise, MAI, multipath propagation and
near-far effects. Simulation results demonstrate the robustness of the Multistage Rake
receiver to near-far effects and manifold capacity improvement compared to conventional
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