CDMA modulation and demodulation method reducing interference an

Details CDMA modulation and demodulation method reducing interference an CDMA modulation and demodulation method reducing interference an

1997-07-24

1999-12-28

Patel, Ajit

Multiplex communications

Generalized orthogonal or special mathematical techniques

Particular set of orthogonal functions

370320, 375200, H04B 1707

Patent

active

06009074&

ABSTRACT:
A CDMA (Code Division Multiple Access) modulation and demodulation method and a communication system using the same which simultaneously transmits a pilot signal and a data signal through the same channel, thereby being capable of not only greatly the complexity of its transceiver, but also achieving an improvement in performance where a large number of multipaths are used. The method includes the steps of (a) generating a pilot signal and a transmission data signal; (b) spreading the pilot signal and the transmission data signal, by multiplying the pilot signal by an inphase pseudo noise sequence and by multiplying the transmission data by a quadrature pseudo noise sequence, respectively; (c) generating an inphase signal and a quadrature signal, by multiplying the spread pilot signal by an inphase walsh data sequence and by multiplying the spread transmission data by a quadrature walsh data sequence, respectively; (d) modulating the inphase signal and the quadrature signal, by multiplying the inphase signal and the quadrature signal by carrier signals; and (e) transmitting a composite signal created by adding the modulated inphase signal to the modulated quadrature signal.

REFERENCES:
patent: 5341397 (1994-08-01), Gudmundson
patent: 5416797 (1995-05-01), Gilhousen et al.
patent: 5528624 (1996-06-01), Kaku et al.
patent: 5671221 (1997-09-01), Yang
patent: 5708658 (1998-01-01), Sugita
patent: 5712869 (1998-01-01), Lee et al.
patent: 5715236 (1998-02-01), Gilhousen et al.
patent: 5751761 (1998-05-01), Gilhousen
patent: 5841806 (1998-11-01), Gilhousen et al.
patent: 5844936 (1998-12-01), Lesthievent

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