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This letter deals with frequency domain equalization (FDE) in the presence of residual timing offsets. A novel iterative decision feedback equalizer for single-carrier FDE systems is proposed. Different from conventional schemes based on explicit point time-delay estimates, the proposed scheme operates directly on the oversampled matched filter output. For each iteration, FDE is performed first, and...
An algorithm which uses the Kalman filter to estimate the time-varying fading coefficients in orthogonal frequency division multiplexing (OFDM) systems is addressed. The algorithm is based on a parametric channel model where the channel response is characterized as a collection of sparse propagation paths. We investigate into how to estimate the channel by the Kalman filter in the pilot-aided OFDM...
The distributed cooperative diversity techniques are attracting a lot of attention as a means of advancing error performance and capacity. Transmit diversity is created when the selected stations assist a sender by relaying its information signal to the destination. The average symbol error rate (SER) of the distributed spatial diversity wireless cooperative system with L amplifying relays in Rayleigh...
In this paper, we devoted to semi-blind carrier frequency offset estimation for burst-mode transmission on the AWGN channel. Based on the framework of the well-known expectation-maximization (EM) algorithm, in addition to the uses of known pilot symbols, the proposed semi-blind estimation (SBE) algorithm jointly exploits the a posteriori information of the unknown data symbols which were referred...
A new algorithm for tracking time-varying fading channels in impulse noise environment is proposed in this paper, which uses the Kalman filter based on Clarke's model. However, the Kalman filter is known to be sensitive to impulse noise. In this paper, we investigate into how to restrain the adverse effect of impulse noise. The impulsive noise is modeled as a two-term Gaussian mixture distribution...
The presence of gain and phase errors between array elements and corresponding channels is known to significantly degrade the performance of most high resolution direction of arrival (DOA) estimation algorithms. In this paper, a simple calibration scheme is proposed to eliminate the errors existing in the multiple channels of a direction finding (DF) system equipped with a uniform circular array (UCA)...
Multipath is a major impairment in the wireless communication system, and the channel estimation significantly affects the performance of the receiver. Its performance can be improved if an appropriate channel estimation filter is used according to the foreknow information of the fading channel. We propose an algorithm which uses the Kalman filter based on Clarke's model to track the time-varying...
The estimation of a time-varying multipath fading channel is a difficult task for the receiver. Its performance can be improved if an appropriate channel estimation filter is used according to the prior knowledge of the fading channel. We propose an algorithm which uses the Kalman filter based on Clarke's model to track the time-varying multipath fading channel. To reduce the complexity of the high-dimensional...
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