Sync acquisition and tracking circuit for DS/CDMA receiver

Details Sync acquisition and tracking circuit for DS/CDMA receiver Sync acquisition and tracking circuit for DS/CDMA receiver

1994-12-30

1996-08-27

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

H04B 1707

Patent

active

055508111

ABSTRACT:
In a sync acquisition and tracking circuit for a DS/CDMA receiver, phase position signals are sequentially and cyclically selected at a specified rate higher than the rate at which Rayleigh fading occurs. The selected signal is used to-control the phase of PN sequences. Correlation is taken between spread pilot signals and the orthogonal PN sequences at a chip rate to produce despread pilot signals, which are integrated to produce a correlation value. A set of accumulators are provided, which are sequentially and cyclically selected at the specified rate. The correlation value is applied to the selected accumulator to produce a total sum of correlation values. The highest total sums are selected from the outputs of all accumulators, and corresponding phase position signals are identified. A set of orthogonal despreading sequences are generated corresponding to the identified phase position signals for application to the receiver.

REFERENCES:
patent: 5420850 (1995-05-01), Umeda et al.

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