In this paper we consider the problem of data-aided synchronization in the up-link of a multiple access (MA) orthogonal frequency division multiplexing (OFDM) system based on offset quadrature amplitude modulation (OQAM). In particular, the joint maximum likelihood (ML) phase offset, carrier-frequency offset (CFO) and symbol timing (ST) estimator exploiting a short known preamble embedded in the burst received from each of U users is considered. Under the assumption that the CFO of each user is sufficiently small the considered approach leads to U different approximate ML (AML) joint phase offset, CFO and ST estimators. Specifically, the phase and CFO estimators are in closed form while the AML ST estimator requires a one-dimensional maximization procedure. The performance of the proposed joint AML estimator is assessed via computer simulations both in AWGN and multipath channel, and for three different allocation schemes.
Joint symbol timing and CFO estimation in multiuser OFDM/OQAM systems / Fusco, Tilde; Petrella, Angelo; Tanda, Mario. - ELETTRONICO. - (2009), pp. 613-617. (Intervento presentato al convegno Workshop on Signal Processing Advances in Wireless Communications (SPAWC 2009) tenutosi a Perugia nel June 21-24) [10.1109/SPAWC.2009.5161858].
Joint symbol timing and CFO estimation in multiuser OFDM/OQAM systems
FUSCO, TILDE;PETRELLA, ANGELO;TANDA, MARIO
2009
Abstract
In this paper we consider the problem of data-aided synchronization in the up-link of a multiple access (MA) orthogonal frequency division multiplexing (OFDM) system based on offset quadrature amplitude modulation (OQAM). In particular, the joint maximum likelihood (ML) phase offset, carrier-frequency offset (CFO) and symbol timing (ST) estimator exploiting a short known preamble embedded in the burst received from each of U users is considered. Under the assumption that the CFO of each user is sufficiently small the considered approach leads to U different approximate ML (AML) joint phase offset, CFO and ST estimators. Specifically, the phase and CFO estimators are in closed form while the AML ST estimator requires a one-dimensional maximization procedure. The performance of the proposed joint AML estimator is assessed via computer simulations both in AWGN and multipath channel, and for three different allocation schemes.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.