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.
Technologies
Multiple access
Product
Use Cases
Wireless communication
Services
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The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
The information in grey was provided by the patent holder
The information in purple was extracted from the FrandAvenue
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