CDMA rake receiver with sub-chip resolution

Details CDMA rake receiver with sub-chip resolution CDMA rake receiver with sub-chip resolution

1995-04-24

1997-07-15

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375349, H04B 1707

Patent

active

056489838

ABSTRACT:
A rake receiver for use in direct-sequence code-division multiple-access communication systems employs a novel channel estimator capable of resolving multipath components spaced closer than a chip interval of the direct-sequence signature sequence. The estimator utilizes a constrained iterative deconvolution technique which employs projection onto convex sets (POCS). In a matched filter rake receiver embodiment, the delay T.sub.SC between two taps of a delay line is smaller than the duration T.sub.C of a chip of pseudo-random sequence. A rake receiver constructed in this manner is capable of detecting signals that have propagated through multipath channels and that have path components spaced closer than one chip of the signal sequence (i.e. closer than the inverse of the signal bandwidth).

REFERENCES:
patent: 5377226 (1994-12-01), Davis
patent: 5448590 (1995-09-01), Kostic
Z. Kostic, M.I. Sezan and E.L.Titlebaum, "Estimation of the Parameters of a Multipath Channel Using Set-Theoretic Deconvolution," IEEE Transactions on Communications, vol. 40, No. 6, Jun. 1992, pp. 1006-1011.
J.G. Proakis, Digital Communications. New York: McGraw-Hill Book Company, 1989, pp. 728-739.

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