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By using frequency-domain oversampling at the receiver, we propose a novel blind channel estimation scheme for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. Specifically, a subspace blind channel estimation approach is developed, based only on second-order statistics of the received signal. The estimated MIMO channel is nicely determined by Nt minimum...
With only second-order statistical information, subspace based blind channel estimation has received considerable attention. To make subspace based blind channel estimation methods feasible, signal redundancy is necessary, which is usually acquired by time-domain oversampling or using multiple receive antennas. In this paper, a new perspective, frequency-domain oversampling, is taken to develop a...
Subspace based blind channel estimation for OFDM systems has received considerable attention. Existing schemes mainly exploit inherent redundancy such as cyclic prefix and virtual subcarriers or artificial redundancy generated by pre-coding. In this paper, OFDM and multicarrier CDMA systems are considered. Frequency-domain oversampling is used at the receiver to perform detection and channel estimation...
Orthogonal frequency-division multiplexing is sensitive to frequency offset between transmit and receive carriers. In this paper, frequency-domain oversampling is applied to tackle this problem. Our approach is motivated by the duality between time and frequency domains and the fact that time-domain oversampling has been successfully used to deal with timing errors. Theoretical minimum mean-square...
A frequency-domain oversampling based scheme is proposed for OFDM systems. It is shown that a linear minimum mean-square error (MMSE) receiver with frequency oversampling can efficiently increase the capacity of OFDM. The improvement in capacity is determined by the number of multipath components of the channel. In contrast, the conventional MMSE receiver without frequency oversampling cannot exploit...
An important problem for multicarrier systems is frequency offset between a transmitter and receiver, which can substantially deteriorate system performance. In this paper, we propose a frequency-domain fractionally-spaced minimum mean square error (FDFS-MMSE) multiuser detector for multicarrier code-division multiple-access (MC-CDMA) systems. Numerical results show that with frequency-domain oversampling...
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