Overview
What you learn in this chapter
This chapter presents an overview of wideband CDMA (W-CDMA) and includes
concepts to help you understand how the analyzer measures W-CDMA signals. For
examples on setting up a W-CDMA measurement, see the chapter titled “Using
Wideband CDMA”’. For key-specific information, refer to online Help, which is
accessed by pressing the [
Help
] key on the analyzer.
What option B73 does
Option B73 (Digital Wideband CDMA Analysis) lets you measure base-station
W-CDMA signals that conform to the Japanese Experimental System and that use
Perch 1. With option B73, the analyzer despreads and decodes W-CDMA signals
and automatically identifies all the active channels regardless of the code rate or
the short code. Option B73 provides the following features:
Note Option B73 requires options AYA (Digital Demodulation Analysis), AY9 (Extended
Time Capture), and UTH (20 Mb Extended RAM and Additional I/O) .
l
Single or composite code-domain power displays (the composite display shows
all code layers simultaneously). You can normalize code-domain power to
display the code-domain power relative to the total signal power in the code
domain.
l
Time-domain displays, such as IQ measured, IQ reference, IQ magnitude or
phase error, and error vector traces.
l
Composite time-domain display, which is the detected, filtered time-domain
waveform (useful for VOX on/off and transmission power control measurements.
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Symbol table display that lets you see error parameters (such as RHO) and
demodulated bits for a code channel.
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Adjustable filter alpha.
l
4 MHz, 8 MHz, and 16 MHz, variable chip rates (the chip rate is variable from
slightly below 4 MHz to slightly above 16 MHz).
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32 MHz chip rate when using the ch1 + j*ch2 receiver (the I component is input
on channel 1; the Q component on channel 2).
l
A standard setup that automatically configures the analyzer for 5 MHz, 10 MHz,
and 20 MHz W-CDMA measurements.
Wideband CDMA Concepts (Options B73, B79, and 080)
24 - 2
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