Presence detection of binary-phase-shift-keyed and direct-sequence spread-spectrum signals using a prefilter-delay-and-multiply device

• Published in: IEEE journal on selected areas in communications 1990-06, Vol.8 (5), p.915-933
• Main Authors: Kuehls, J.F., Geraniotis, E.
• Format: Article
• Language: English
• Subjects: Additive noise; Applied sciences; Binary phase shift keying; Bit rate; Detection, estimation, filtering, equalization, prediction; Exact sciences and technology; Frequency; Gaussian noise; Information, signal and communications theory; Signal analysis; Signal and communications theory; Signal detection; Signal processing; Signal to noise ratio; Signal, noise; Spread spectrum communication; Telecommunications and information theory
• ISSN: 0733-8716; 1558-0008
• DOI: 10.1109/49.56397

The specific problem of detecting the presence of either binary-phase-shift-keyed (BPSK) signals or BPSK direct-sequence spread-spectrum (DS/SS) signals with a prefilter-delay-and-multiply (PFDM) device is considered. Using stationary process theory and Fourier analysis, the optimum PFDM structures for signal presence detection of BPSK signals with known bit rates and carrier frequencies and BPSK DS/SS signals with known chip rates and carriers in additive colored Gaussian noise are derived. The structures are optimum in the sense that they maximize the spectral signal-to-noise ratio (SNR) of an output periodic waveform which has fundamental frequency equal to the bit or chip rate of the signal. Two of the optimum structures that are derived and analyzed are the optimal prefilter-square device and the optimal PFDM with delay set to one half of the signal's bit or chip duration.< >