Type of Document	Master's Thesis
Author	Lichtenstein, Joseph
URN	etd-06102009-063138
Title	Low computational complexity bit error rate simulation for personal communications systems in multipath and fading environments
Degree	Master of Science
Department	Electrical Engineering
Advisory Committee	Advisor Name Title No Advisors Found
Keywords	Code division multiple access
Date of Defense	1994-04-19
Availability	restricted
Abstract This thesis develops simulation techniques for evaluating the performance of future wireless digital multiple access standards for fast and slow moving vehicles in outdoor environments. Code Division Multiple Access (CDMA) and Time Division Multiple Access (TDMA) are both multiple access techniques for wireless systems that can support significantly more users per cell than the present analog FDMA system. Both CDMA and TDMA use digital modulation, and so performance is compared based on bit and packet error rates resulting from the simulations. The primary contribution of this thesis is the development of fast and accurate algorithms for channel simulations, and flexible structured implementation of error correction coding. Previous simulation techniques have resulted in extremely high computational complexity, limiting the number of design options which may be explored. This thesis presents a multirate simulation technique which allows an order of magnitude reduction in simulation times for digital systems on multipath channels. The simulations are carried out for randomly generated data as well as coded voice data. The data is then processed according to the standard selected (IS-54 TDMA or IS-95 CDMA.) The coded bits are transmitted over a simulated baseband channel. Receiver implementations are also examined. Applications of this research include rapid software prototyping of new systems. If the performance of a new system can be accurately evaluated on a computer without building hardware, implementation costs can be significantly reduced.
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