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Recently, an improved Jakes' fading channel simulator was proposed by Pop and Beaulieu to eliminate the stationarity problem occurring in Jakes' original design. In this letter, second-order statistical properties of the improved Jakes' simulator are analyzed. Consistent with Pop and Beaulieu's caution about high-order statistics of the simulator, it is proved that some second-order statistics of both the quadrature components and the envelope do not match the desired ones even if the number of sinusoids approaches infinity. Therefore, care must be taken when the simulator is employed to evaluate algorithms and systems. Index Terms--Fading channel simulator, fading channels, Rayleigh fading, statistics.

A low complexity soft-input soft-output (SISO) block decision feedback equalizer (BDFE) is presented for turbo equalization. The proposed method employs a sub-optimum sequence-based detection, where the soft-output of the equalizer is calculated by evaluating an approximation of the sequence-based a posteriori probability (APP) of the data symbol. The sequence-based APP approximation is enabled by the adoption of both soft a priori information and soft decision feedback, and it leads to better performance and faster convergence compared to symbol-based detection methods as used by most other low complexity equalizers. The performance and convergence property of the proposed algorithm is analyzed by using extrinsic information transfer (EXIT) chart. Both analytical and simulation results show that the new equalizer can achieve a performance similar to that of trellis-based equalization algorithms, with a complexity similar to linear SISO minimum mean square error equalizers. [ABSTRACT FROM AUTHOR]

Analyzes second-order statistical properties of the wide-sense stationary (WSS) Jakes' fading channel simulator. Use of mobile channel simulators; Statistics of WSS Jakes' simulator; Comparison of the normalized autocorrelations of the squarred envelope of simulator output and reference model.