Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Patent
1996-06-28
1998-05-12
Chin, Wellington
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
370342, 370441, 375200, 375297, 327180, 327309, H04J 1300
Patent
active
057517053
ABSTRACT:
A digital base band section includes spread units for directly spreading input transmission data every channel by different spread codes to output spread signals, a summer for summing up the spread signals to output a multiplexed spread signal, a limiter for limiting an amplitude of the multiplexed spread signal not to exceed a predetermined value, and a roll-off filter limits a transmission spectrum by shaping a waveform of the transmission signal to output a digital base band signal to an analog base band/RF section, where it is converted into an analog base band signal by a digital-to-analog converter and a carrier is modulated to convert the analog base band signal into an RF signal in a modulator, which RF signal is amplified in a transmission power amplifier to transmit the amplified RF signal through a transmission antenna.
REFERENCES:
patent: 4458322 (1984-07-01), Veale
patent: 4875044 (1989-10-01), Ohta et al.
patent: 5038341 (1991-08-01), Berman et al.
patent: 5260967 (1993-11-01), Schilling et al.
patent: 5298798 (1994-03-01), Furumiya
patent: 5311555 (1994-05-01), Ichiyoshi
Chin Wellington
NEC Corporation
Vu Huy D.
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