Pulse or digital communications – Repeaters – Testing
Patent
1996-06-06
1998-10-20
Chan, Jason
Pulse or digital communications
Repeaters
Testing
375295, H04B 1500, H04K 100, H04L 2730
Patent
active
058258124
ABSTRACT:
A direct sequence spread spectrum (DSSS) radio communication system of the present invention comprises a transmitter and a matching receiver. The transmitter includes a pseudorandom number (PRN) code generator, a chip clock generator and a 16.times. clock generator that runs at sixteen times the chip clock rate. The output of the PRN code generator and chip clock generator are exclusive-OR'ed to derive a Manchester encoding of the DSSS spreading code. A tri-state buffer is used to deliver such Manchester encoded DSSS spreading code to a mixer to spread a biphase shift keyed (BPSK) radio carrier before being transmitted. The tri-state buffer can be a part of the exclusive-OR logic and is connected to place its output in a high impedance state one sixteenth of every chip clock period. This provides for a suppression of the spurious sidebands that otherwise limit adjacent channel packing.
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Chan Jason
Corrielus Jean B.
Schatzel Thomas E.
Wireless Logic, Inc.
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