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This paper investigates the invariant detection problem of quadrature phase-shift keying (QPSK) direct sequence spread spectrum (DS-SS) signals in additive white Gaussian noise (AWGN). Using the complex Gaussian mixture signal model and invariance principle, we consider the constant-false-alarm-rate (CFAR) invariant detectors and other sub-optimal invariant tests, including the uniformly-most-powerful-invariant...
This paper focuses on optimal detection of quadrature phase-shift keying (QPSK) and binary phase-shift keying (BPSK) direct sequence spread spectrum (DS-SS) signals in additive white Gaussian noise (AWGN) with unknown spreading sequence and other parameters. Using complex Gaussian mixture signal model and invariance principle, we derive constant-false-alarm-rate (CFAR) invariant detectors such as...
In this letter, the problem of 2-D direction-of-arrival (DOA) estimation for noncircular sources employing L-shape arrays is addressed. Firstly, we construct an extended cross-covariance matrix between the extended data samples which are obtained by concatenating the observation data and their conjugated components along the z-axis and the x-axis. Then the elevation angle is obtained by using simultaneous...
A new fast and accurate method for estimating the frequency of a complex sinusoid in complex white Gaussian environments is proposed. Inspired by the works of Kay and Kim et al., the method is based on the differential phase measurements with an arbitrary delay. This approach is different from the Kim et al. method and needs much less computational operations, yet produces very comparable performance...
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