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Turbo-Coded OFDM Transmission Over a Nonlinear Channel

Overview In this paper, deliberate level clipping and Turbo-coding are combined to achieve an Orthogonal Frequency Division Multiplexing (OFDM) transmission system with a low Peak-to-Average power Ratio (PAR) and a good performance. Using the linear approximation technique, the metric computation for the Turbo-decoding is first modified in order to consider the distortion effects of the nonlinearity, caused by the Cartesian clipping. The linear approximation of the nonlinear device is based on the Minimum Mean Square Error (MMSE) criterion. By exploiting the linear model, the receiver calculates a modified metric considering the effects of the nonlinearity. Also, this paper introduces a modified Turbo-decoder which simultaneously performs the data estimation and signal reconstruction.

Further White Paper Details
Publisher	University of Waterloo	File Format	PDF, requires Acrobat Rdr 5
Date Published	June 2004	Downloads	14
Format	White Papers
Topics	Wireless LAN, Modems, Mobile - Wireless Communications

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