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| Modified EXIT Chart Method for Performance Analysis of Turbo Equalization in Non-Gaussian Impulsive Noise Environments |
| Luo Kang-sheng; Zhao Ming-sheng |
| Department of Electrical Engineering, Tsinghua University, Beijing 100084, China |
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Abstract A modified EXtrinsic Information Transfer chart (EXIT chart) method is proposed. This EXIT chart is adopted as a tool to analyze the convergence behavior and to predict the performance of turbo equalization in additive non-Gaussian impulsive noise channel. The probability distribution of the extrinsic information is estimated to improve the traditional EXIT chart under symmetric α stable noise environment. Together with the Bit Error Rate (BER) analysis, the performances of turbo equalization, such as iterative trajectory, iterative convergence and the BER value at each iteration, are predicted. The experiments on the truncated turbo equalizer show that the predicted performances are consistent with the simulated results. Thus the validity of the proposed method is verified.
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Received: 23 June 2008
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2009, Vol. 31 
