A Novel Low-Complexity IF-Sampling ReceiverKevin Hung (supervisor: Dr. Michel Fattouche)
M.Sc. Thesis, The University of Calgary, December 1996
As advances in technology provide faster and cheaper digital hardwares, it is becoming more feasible to implement a receiver in the digital domain. One widely adopted architecture is the IF-sampling receiver which samples the intermediate-frequency signal and recovers the transmitted information in the digital domain. By restricting the modulation to be linear, such as quadrature phase shift keying (QPSK), this thesis proposes a new receiver architecture which employs the minimum sampling rate of 2 samples per symbol and trivial digital processing to recover the inphase and quadrature symbols. In addition to the new receiver architecture, this thesis also presents the design of a zero intersymbol interference signalling pulse specifically for this new receiver. With the new pulse and the new receiver, the effect of sampling timing error on the system performance is investigated. Simulation results indicate that the bit error rate becomes irreducible when the timing error is greater than 15% of the symbol period. Two systems are proposed to combat the timing error problem. The first system is a direct sequence spread spectrum system using 11 chip Barker sequence. This system uses the autocorrelation of the Barker sequence to suppress the intersymbol interference. The second system takes a different approach in which the intersymbol interference is greatly avoided by simply increasing the sampling rate to 4 samples per symbol and making slight changes in the digital structure of the receiver. Simulation results are also obtained to show the performance of the two systems.
CONTACTS: Michel Fattouche, Kevin Hung
SUBJECTS: RF Circuits and Systems
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