Appeal No. 97-2892
Application No. 08/274,556
The disclosed invention relates to method and apparatus
for making an orthogonal code division multiple access (OCDMA)
wireless telephone system more tolerant of multipath delay
spread.
Claim 1 is illustrative of the claimed invention, and it
reads as follows:
1. In an orthogonal code division multiple access
(OCDMA) wireless telephone system having a base station and a
plurality of mobile transceiver handsets, sending modulator
and receiving demodulator means in said base station and each
said mobile transceiver handset, respectively, the improvement
for making said OCDMA system more tolerant of multipath delay
spread, comprising, each said sending modulator means having 8
to 64 PN chips per each Rademacher-Walsh (RW) chip, each
receiving demodulator means having a correlator for providing
a demodulator output signal; and each modulator means
including means for setting the PN chipping rate high enough
such that said correlators provide processing gain
discrimination against multipath signal components delayed
more than a small fraction of a RW chip duration.
The references relied on by the examiner are:
Gilhousen et al. (Gilhousen) 5,103,459 Apr.
7, 1992
Dixon, “Spread Spectrum Systems with Commercial Applications,”
page 282.3
entered.
3This publication lacks both a publication source and a
publication date. In the absence of a challenge by the
2
Page: Previous 1 2 3 4 5 6 7 8 9 Next
Last modified: November 3, 2007