Pulse or digital communications – Repeaters – Testing
Patent
1996-09-30
1999-09-28
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375205, 375208, 375219, 370209, 370335, 370491, H04B 1500, H04K 100, H04L 2730
Patent
active
059600292
ABSTRACT:
A coherent dual-channel QPSK modulator/demodulator for a CDMA system, and modulating/demodulating methods therefor, are disclosed, in which the crosstalk interferences between an I-channel and a Q-channel are eliminated by an orthogonal spreading method, which assigns different Walsh codes to the I-channel and Q-channel. Pseudo-random modulation and pseudo-random demodulation are carried out by using one PN code so as to minimize the channel parameter estimation errors, thereby improving receiving performance.
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PN-3421 (to be published as IS-95-A) Ballot Version, "TR 45, Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum Cellular System".
JTC(IAR)/95.01.10-478R5, Joint Technical Committee (JTC), "Proposed Wideband CDMA PCS Standard".
Jung Jae-Wook
Kang Byung-Shik
Kim Seong-Rag
Lee Hun
Chin Stephen
Electronics and Telecommunications Research Institute
Roundtree Joseph
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