Time-Varying Frequency Fading Channel Tracking In OFDM-PLNC System, Using Kalman Filter

Kalman-Filter Channel Estimator for OFDM System In Time-Varying Channel

This paper presents a method of improving the least square channel estimator accuracy without increasing the pilot density. The Kalman filter process equation can be represented as Autoregressive model, and the least square channel estimate is seen as a noisy measurement of the true channel state, so the Kalman filter measurement equation can be represented as the least square estimated channel...

Performance analysis of high QAM OFDM system over frequency selective time-varying fading channel

t This paper considers the performance degradation of a high Q A M orthogonal frequency division multiplexing (OFDM) system over frequency selective time-varying fading channels. The time variation of the channel during one O F D M frame destroys the orthogonality of different sub-carriers and generates power leakage among the subcarriers, known as Inter-Carrier Interference (ICI). The statisti...

Doppler and bearing tracking using fuzzy adaptive unscented Kalman filter

The topic of Doppler and Bearing Tracking (DBT) problem is to achieve a target trajectory using the Doppler and Bearing measurements. The difficulty of DBT problem comes from the nonlinearity terms exposed in the measurement equations. Several techniques were studied to deal with this topic, such as the unscented Kalman filter. Nevertheless, the performance of the filter depends directly on the...

Kalman-filter-based channel estimation for orthogonal frequency-division multiplexing systems in time-varying channels

A low-complexity Kalman-filter-based channel estimation method for orthogonal frequency-division multiplexing systems is proposed. This method belongs to the pilot-symbol-aided parametric channel estimation method in which the channel responses are characterised as a collection of sparse propagation paths. Because of the slow variation of the signal subspace in the channel samples’ correlation ...

A Novel Scheme for Frequency Synchronization and Kalman Filter Based Channel Estimation for OFDM Transmission System

OFDM has recently been applied widely in wireless communication system due to its high data rate transmission capability with high bandwidth efficiency and its robustness to multipath delay. In this paper we present the improved scheme of frequency offset estimation technique using joint symbol timing for OFDM-based transmission systems. The frequencyoffset estimation utilizes a repetitive sign...

ICI Reduction using Extended Kalman Filter in OFDM System