Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2005-04-05
2005-04-05
Ha, Dac V. (Department: 2634)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S150000, C375S152000, C375S343000, C375S364000, C375S367000, C342S357490, C342S441000, C342S400000
Reexamination Certificate
active
06876692
ABSTRACT:
According to the present invention a received Direct Sequence Code Division Multi-Access (DS-CDMA) signal is differentially decoded at the chip level. A number of signaling schemes can be used in the invention including (1) an ON/OFF signaling scheme in which a pseudo noise number (PN) code is sent only in response to one data bit value, and no signal is sent in response to the other bit value; (2) a Two Code signaling scheme in which bit values of 1 triggers a first PN code to transmitted, and a bit value of 0 triggers a second PN code to be transmitted; and (3) an M-ary signaling method in which a plurality of data bit patterns respectively, trigger a plurality of PN codes to be transmitted. After differential decoding the received signal is despread using one or more PN codes, that can be vector sums of two or more PN codes.
REFERENCES:
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patent: 5917852 (1999-06-01), Butterfield et al.
patent: 5953369 (1999-09-01), Suzuki
patent: 6115427 (2000-09-01), Calderbank et al.
patent: 6570864 (2003-05-01), Kim et al.
patent: 6728306 (2004-04-01), Shi
O'Dea Robert J.
Shi Qicai
Ha Dac V.
Haas Kenneth A.
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