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Near-far resistant channel estimation for CDMA systems using the linear decorrelating detector

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3 Author(s)
Missiroli, M. ; Dept. of Electr. & Electron. Eng., Bradford Univ., UK ; Yingjie Jay Guo ; Barton, S.K.

The well-known linear decorrelating detector (LDD) for direct-sequence code-division multiple-access (CDMA) systems provides near-far resistant performance when the timing of each user is accurately known. Traditional CDMA acquisition techniques suffer from high differences in power levels. The estimation accuracy for a user overwhelmed by stronger ones is likely to be unsatisfactory; at the same time, the interference from a user undergoing acquisition or tracking is not removed by the standard LDD. In this paper, a fully near-far resistant technique for acquisition and tracking for asynchronous CDMA systems applying the LDD is proposed, considering realistic band-limited signals. This technique is based on the adoption of a pair of special sequences equivalent to a dedicated access channel and is shown to provide a relatively fast and robust means to perform channel estimation both in case of single- and multipath channels

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Communications, IEEE Transactions on  (Volume:48 ,  Issue: 3 )