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Subject: Question about CDMA (IS-95)
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Date: 03/06/01 at 5:30 AM
Posted by: Borja Perez
I´m trying to understand how an IS-95 base station works, and I´ve found it hard to get to know where the different logical channels (each one spread with its Walsh code) are added to the same carrier. I wonder if it´s done before QPSK modulation, or else, they are modulated separately before being amplified alltogether. Maybe each logical channel must have its own circuitry up to the antenna connectors (what a waste!).
Thanks in advance for any help.
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