Title page for ETD etd-02132009-172635


Type of Document Master's Thesis
Author Kaul, Ashish
URN etd-02132009-172635
Title An adaptive multistage interference cancellation receiver for CDMA
Degree Master of Science
Department Electrical Engineering
Advisory Committee
Advisor Name Title
Woerner, Brian D. Committee Chair
Rappaport, Theodore S. Committee Member
Reed, Jeffrey Hugh Committee Member
Keywords
  • bit error rates
Date of Defense 1995-03-23
Availability restricted
Abstract
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 demodulation techniques.

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