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Channel estimation is an integral part of receiver designs in coherent OFDM systems. Moreover channel estimation is a challenging problem in wireless systems, due to time variation of the multipath channel. In this paper, a time domain channel estimation method for rapidly time varying channel in LTE Uplink, which we have been proposed previously is further studied in the presence of guard band and...
In this paper, we first propose a novel clipping, named as repeated enlipping (RE) scheme. Then, we integrate the proposed RE scheme into the conventional active constellation extension (ACE) scheme, called as ACE-RE scheme, to reduce the peak-to-average power ratio (PAPR) of the orthogonal frequency division multiplexing (OFDM) signals. The proposed ACE-RE scheme may greatly improve the convergence...
We propose two new techniques to mitigate the "edge effect" of the traditional Discrete Fourier Transform (DFT)based channel estimator for OFDM systems with Null subcarriers. Both techniques try to reduce the "edge effect" by generating virtual pilots (VP) in the receiver to fill the missing pilots in the Null spectrum. In the first technique, VPs are generated such that the channel...
This paper addresses adaptive channel estimation for time-varying mobile wireless channels with nonstationary statistics. We presents a reduced complexity adaptive channel estimator based on a set membership filtering approach known as the Optimal Bounding Ellipsoid (OBE) algorithm. To exploit time and frequency domain correlation properties of the channel in an efficient low-complexity way, we allow...
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