Correlation system for use in wireless direct sequence spread sp

Details Correlation system for use in wireless direct sequence spread sp Correlation system for use in wireless direct sequence spread sp

1994-11-07

2000-10-03

Pham, Chi H.

Pulse or digital communications

Spread spectrum

Direct sequence

375150, A61F 206, H04L 2730

Patent

active

061283312

ABSTRACT:
A correlation system for use in wireless direct sequence spread spectrum systems includes a RF down converter which receives an encoded RF signal and generates therefrom analog in-phase (I) and quadrature (Q) signal components. These components are digitized and the digitized signals are then passed to each of the high precision correlator circuit and a low precision correlator circuit. The low precision correlator circuit consist of a bank of a plurality of low precision correlators which receive the I and Q signal components as inputs and correlates the same with progressively phase shifted or delay pseudo noise (PN) codes. A low precision correlation circuit locks on to the appropriate PN code phase shift or delay and applies the same as a reference PN code to the high precision correlation circuit for data acquisition and demodulization.

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