Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Reexamination Certificate
2000-06-26
2001-06-05
Cangialosi, Salvatore (Department: 2661)
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
C370S342000, C370S441000
Reexamination Certificate
active
06243370
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to spread spectrum communications and more particularly to a personal communications network which communicates over the same spectrum as used by a plurality of existing narrowband microwave users.
DESCRIPTION OF THE PRIOR ART
The current fixed service, microwave system uses the frequency band 1.85-1.99 GHz. Microwave users in this frequency band typically have a bandwidth of 10 MHz or less.
A problem in the prior art is the limited capacity of the channel, due to the number of channels available in the fixed service, microwave system.
A personal communication network unit used in a spread spectrum code division multiple access (CDMA) communication system. The CDMA communication system co-exists with a microwave system which selectively utilizes various microwave frequencies within a selected range of frequencies. The unit generates a spread spectrum CDMA data signal using a pseudo random chip code sequence. The spread data signal encompassing the selected range. T h e unit notch filters the spread data signal at microwave frequencies within the selected range used by the microwave system. The notch filtered spread data signal is transmitted to a base station.
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Cangialosi Salvatore
InterDigital Technology Corporation
Volpe & Koenig P.C.
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