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MMSE interference suppression for timing acquisition and demodulation in direct-sequence CDMA systems

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1 Author(s)
U. Madhow ; Dept. of Electr. & Comput. Eng., Illinois Univ., Urbana, IL, USA

It has been shown that minimum-mean-squared-error (MMSE) demodulators are effective means of interference suppression in code division multiple-access (CDMA) systems. The MMSE demodulator can be implemented adaptively using an initial training sequence, followed by decision-directed adaptation. This requires that the symbol-level timing of the desired user be known prior to training. We remove this requirement by providing a method for timing acquisition in which the output of the acquisition process is a near-far-resistant demodulator which automatically accounts for the delays and amplitudes of both the desired signal and the interference without explicitly estimating these parameters. The only requirements are a training sequence for the desired user and a finite uncertainty regarding the symbol timing. The latter condition can be realized by using a periodic training sequence even if the absolute timing uncertainty is arbitrarily large

Published in:

IEEE Transactions on Communications  (Volume:46 ,  Issue: 8 )