Maximum Likelihood Time Synchronization for Zero-Padded OFDM

Turbo Demodulation of Zero-Padded OFDM Transmissions

An Iterative Maximum Likelihood Synchronization Method for OFDM System

OFDM system divides a wideband transmission bandwidth into several overlapped narrowband subcarriers to avoid the serious frequency selective fading problem. However, if Timing Offset (TO) and Carrier Frequency Offset (CFO) exist between the Transmitter (Tx) and Receiver (Rx), OFDM system will suffer the Inter-Symbol Interference (ISI) and Inter-Carrier Interference (ICI) that degrade the syste...

Data-aided maximum likelihood frequency synchronization for OFDM systems

Distinct from conventional approaches, we apply a generalized data-aided signal model which can jointly consider the cyclic prefix with the preamble/pilot to propose three dataaided frequency offset estimation algorithms based on maximum likelihood criterion. The proposed algorithms differ from each other in the processing domain and the observation space. They can not only systematically estim...

Reduced complexity equalizers for zero-padded OFDM transmissions

The widespread application of OFDM for local area mobile wireless broadband systems is strongly motivated by the simple equalization it a ords. OFDM's bottleneck of channel-dependent performance was only recently addressed by replacing the cyclic pre x (CP) with trailing zeros (TZ). Such zero-padded OFDM transmissions enable FIR channel-irrespective symbol recovery which results in signi cant B...

Maximum Likelihood Blind Carrier Synchronization in Space-time Coded Ofdm Systems

This paper deals with the problem of blind carrier synchronization in orthogonal frequency division multiplexing (OFDM) systems when the transmitted signal is encoded using space-time block codes (STBC). In this context the carrier synchronism is critical to guarantee the orthogonality of the OFDM subcarriers and minimize the intercarrier interference (ICI). With this purpose, the maximum likel...