Blind estimation of amplitudes, phases, time delays and frequency offsets in multiple-access systems with circular transmissions

Authors:
Antonio Napolitano;Simone Ricciardelli;Mario Tanda
Affiliations:
Dipartimento di Ingegneria Elettronica e delle Telecomunicazioni, Università di Napoli Federico II, Napoli, Italy;Dipartimento di Ingegneria Elettronica e delle Telecomunicazioni, Università di Napoli Federico II, Napoli, Italy;Dipartimento di Ingegneria Elettronica e delle Telecomunicazioni, Università di Napoli Federico II, Napoli, Italy
Venue:
Signal Processing
Year:
2005

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Abstract

The problem of blind parameter estimation in multiple-access communication systems with circular transmissions is addressed. A non-data aided algorithm based on the higher-order cyclostationarity features of the received signal is proposed to estimate amplitude, phase, time delay, and frequency shift of each user. Furthermore, a reduced-complexity version of the algorithm is proposed whose computational cost is comparable with that of the second-order statistic based techniques. Simulation results are presented to show the effectiveness of the proposed algorithm to properly operate in severe noise and interference environments.