Receiver method and apparatus with complex pilot filter
First Claim
Patent Images
1. A method for demodulating a received signal comprising:
- filtering an in-phase component of a complex despread signal to produce an in-phase pilot filter signal;
filtering a quadrature-phase component of the complex despread signal to produce a quadrature-phase pilot filter signal;
multiplying the in-phase component by a Walsh code to produce an in-phase Walsh despread signal;
multiplying the quadrature-phase component by the Walsh code to produce a quadrature-phase Walsh despread signal;
multiplying the in-phase Walsh despread signal by the in-phase pilot filter signal to produce a first phase-adjusted signal;
multiplying the quadrature-phase Walsh despread signal by the quadrature-phase pilot filter signal to produce a second phase-adjusted signal; and
adding the first phase-adjusted signal to the second phase-adjusted signal to produce a first soft decision data signal.
0 Assignments
0 Petitions
Accused Products
Abstract
Demodulation of a received high rate CDMA wireless signal is obtained by filtering a complex received signal to provide a complex pilot filter signal. The complex pilot filter signal is then use to phase-adjust a set of demodulated subscriber channel signals.
4 Citations
19 Claims
-
1. A method for demodulating a received signal comprising:
-
filtering an in-phase component of a complex despread signal to produce an in-phase pilot filter signal;
filtering a quadrature-phase component of the complex despread signal to produce a quadrature-phase pilot filter signal;
multiplying the in-phase component by a Walsh code to produce an in-phase Walsh despread signal;
multiplying the quadrature-phase component by the Walsh code to produce a quadrature-phase Walsh despread signal;
multiplying the in-phase Walsh despread signal by the in-phase pilot filter signal to produce a first phase-adjusted signal;
multiplying the quadrature-phase Walsh despread signal by the quadrature-phase pilot filter signal to produce a second phase-adjusted signal; and
adding the first phase-adjusted signal to the second phase-adjusted signal to produce a first soft decision data signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. An apparatus comprising:
-
in-phase pilot filter configured to filter an in-phase component of a complex despread signal to produce an in-phase pilot filter signal;
quadrature-phase pilot filter configured to filter a quadrature-phase component of the complex despread signal to produce a quadrature-phase pilot filter signal;
in-phase Walsh multiplier configured to multiply the in-phase component by a Walsh code to produce an in-phase Walsh despread signal;
quadrature-phase Walsh multiplier configured to multiply the quadrature-phase component by the Walsh code to produce a quadrature-phase Walsh despread signal;
first multiplier configured to multiply the in-phase Walsh despread signal by the in-phase pilot filter signal to produce a first phase-adjusted signal;
second multiplier configured to multiply the quadrature-phase Walsh despread signal by the quadrature-phase pilot filter signal to produce a second phase-adjusted signal; and
first summer configured to add the first phase-adjusted signal to the second phase-adjusted signal to produce a first soft decision data signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. An apparatus comprising:
-
means for filtering an in-phase component of a complex despread signal to produce an in-phase pilot filter signal;
means for filtering a quadrature-phase component of the complex despread signal to produce a quadrature-phase pilot filter signal;
means for multiplying the in-phase component by a Walsh code to produce an in-phase Walsh despread signal;
means for multiplying the quadrature-phase component by the Walsh code to produce a quadrature-phase Walsh despread signal;
means for multiplying the in-phase Walsh despread signal by the in-phase pilot filter signal to produce a first phase-adjusted signal;
means for multiplying the quadrature-phase Walsh despread signal by the quadrature-phase pilot filter signal to produce a second phase-adjusted signal; and
means for adding the first phase-adjusted signal to the second phase-adjusted signal to produce a first soft decision data signal.
-
Specification