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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...
Inspired by the idea of network coding, we propose a cascading data collection (CDC) mechanism to reliably gather sensor data without any structural information. In order to send data back to the sink in the CDC mechanism, sensor nodes wait cascadingly based on their hops to the sink. The intermediate node stores the innovative received data from its farther neighboring nodes and sends out a packet...
An energy efficient cooperative density control algorithm, EECDC, is proposed in this paper. EECDC is based on a new sensing model - cooperative sensing model (CSM) other than traditional Boolean sensing model (BSM), and multi-sensors' cooperative exploration is considered in it. According to CSM, serials of nonlinear constrained programming models are developed to find the optimal conditions for...
The estimation of a time-varying fading channel in multiple-input multiple-output (MIMO) wireless systems 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. The authors propose an algorithm which uses the Kalman filter based on Clarke's model to track the MIMO time-varying...
In the wireless fading environment, channel diversity is an effective method to improve the performance of wireless communication, while there are no uniform criteria to quantify the performance of channel diversity. Generally, channel diversity can achieve the benefits of energy gain and diversity gain, a novel method using energy order and diversity order to quantify the performance of channel diversity...
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...
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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