System for transmitting and receiving polarized CDMA signals and

Details System for transmitting and receiving polarized CDMA signals and System for transmitting and receiving polarized CDMA signals and

1997-06-02

1999-04-27

Patel, Ajit

Multiplex communications

Communication over free space

Repeater

370516, H04B 7216

Patent

active

058983627

ABSTRACT:
A satellite communications system employs CDMA multiple access technology. Polarizations are associated with each spreading code to enhance separation between simultaneous users in the absence of perfectly orthogonal spreading codes. A satellite transmitter CDMA encodes(210) and carrier modulates(220) a user or block of users, and then assigns a polarization to the user of block of users. A CDMA reference signal also receives a polarization. A ground receiver (30,40) receives the polarized CDMA signals as transmitted by the satellite. The ground receiver ascertains the polarization of the reference signal and then computes the polarization of the desired polarized CDMA signal. The use of the reference signal negates the effects of the faraday rotation caused by the satellite signal(10,20) passing through the ionosphere.

REFERENCES:
patent: 5276452 (1994-01-01), Schuss et al.
patent: 5574721 (1996-11-01), Magill
patent: 5608722 (1997-03-01), Miller
patent: 5691974 (1997-11-01), Zehavi et al.
patent: 5694395 (1997-12-01), Myer et al.

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