Decision rules applied to spread spectrum signal detection
R. J. Kim, S. Rosenstark, J. Frank · Defense Technical Information Center (DTIC) · 1984
Decision rules for detection of spread spectrum signals were investigated. For each decision rule, error and erasure probabilities were analyzed. The obtained data was used to plot P sub E vs. P sub E for constant signal-to-noise ratio (SNR). With the use of the probability-of-a-word-error curves the optimum threshold setting was found for a given SNR. Orthogonal signalling (FSK) and antipodal signalling (PSK) were considered for modulating the chips. When the P sub E vs. P sub E plots for FSK and PSK were compared, PSK performed better than FSK by a ratio of 6 dB. Finally, analog and digital correlation of the received signals was investigated. Compared to the performance of analog correlation, the system performance for digital correlation was worse by less than 1 dB. (Author)