Spread Spectrum Acquisition and Tracking.
Final rept. 30 Jun 84-30 Jun 85,
CITY COLL NEW YORK COMMUNICATIONS SYSTEMS LAB
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This report discusses the following subjects An acquisition scheme for a frequency-hopped SS signal received over a Rayleigh multipath channel with random delay time. We consider relatively fast FH with a hopping rate of 1 KHZ and 127 different hopping frequencies. The received signal is embedded in white Gaussian noise. While the above problem appears to be specific the approach given below is general and can be generalized further. In this case, ignoring the spreading effect, there will be a possible overlapping between only three adjacent frequencies. For such a case we propose an optimum receiver and acquisition scheme whose characteristics are analyzed mathematically and by computer simulation. We characterize the performance of the acquisition scheme by the probability of detection for given probability of false acquisition when the input signal is white Gaussian noise only. The probability of detection is the probability that, at the end of the observation period, the desired signal code sequence is detected. Keywords include Spread spectrum Acquisition Simulation Direct sequence and Frequency hopping.