Abstract
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 (UMPI) test and the generalized likelihood ratio test (GLRT). We derive an asymptotic locally most-powerful invariant (ALMPI) test and obtain the incoherent weighted multi-cycle detectors, which act as the performance upper bound of the spreading sequence period detectors based on second-order cyclostationary statistics. Simulation results demonstrate that, with finite observation samples, the ALMPI test exhibits better detection performance than the cycle feature detectors.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.