Joint symbol timing and CFO estimation in multiuser OFDM/OQAM systems
2009
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.
Keywords:
- Mathematical optimization
- Channel allocation schemes
- Multipath propagation
- Quadrature amplitude modulation
- Electronic engineering
- Estimator
- Offset (computer science)
- Computer science
- Orthogonal frequency-division multiplexing
- Communication channel
- Carrier frequency offset
- Additive white Gaussian noise
- Synchronization
- Correction
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- Cite
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