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

• Main Authors: S. Khosroazad, N. Neda, H. Farrokhi
• Format: Article
• Language: English
• Published: Iran University of Science and Technology 2016-09-01
• Series: Iranian Journal of Electrical and Electronic Engineering
• Subjects: Physical Layer Network Coding; Decode-and-forward; Orthogonal Frequency Division Multiplexing (OFDM); channel tracking; Kalman Filter.
• Online Access: http://ijeee.iust.ac.ir/browse.php?a_code=A-10-1749-1&slc_lang=en&sid=1

Physical-layer network coding (PLNC) has the ability to drastically improve the throughput of multi-source wireless communication systems. In this paper, we focus on the problem of channel tracking in a Decode-and-Forward (DF) OFDM PLNC system. We proposed a Kalman Filter-based algorithm for tracking the frequency/time fading channel in this system. Tracking of the channel is performed in the time domain while data detection is implemented in the frequency domain. As an important advantage, this approach does not need for training of some subcarriers in every OFDM symbols and this, results in higher throughput, compared to other methods. High accuracy, no phase ambiguity, and stability in fast fading conditions are some other advantages of this approach.