A fast fading channel identification method for OFDM communication system

Authors:
Zhu Liang Yu;Fan Yang;Wee Ser
Affiliations:
Nanyang Technological University, Singapore;Nanyang Technological University, Singapore;Nanyang Technological University, Singapore
Venue:
Proceedings of the 2006 international conference on Wireless communications and mobile computing
Year:
2006

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Abstract

A fading channel identification and tracking method for orthogonal frequency division multiplexing (OFDM) communication system is proposed in this paper. The fading channel is modeled as an auto-regression (AR) process with unknown AR parameters. With the AR model of channel, a state-space representation of the the system is formulated. The system parameters are identified using subspace based method and Kalman filtering. With training symbols and feedback decisions, the system model is simplified to have fixed parameters contrast with other subspace based identification methods. Moreover, QR based subspace method is proposed to solve this problem efficiently. Numerical simulation results show that the proposed method can be applied in fast fading environment.