Display limitations (W-CDMA(3GPP)/HSPA)
All W-CDMA Code Division Multiple Access: One of several digital wireless transmission methods in which signals are encoded using a specific pseudo-random sequence, or code, to define a communication channel. A receiver, knowing the code, can use it to decode the received signal in the presence of other signals in the channel. This is one of several "spread spectrum" techniques, which allows multiple users to share the same radio frequency spectrum by assigning each active user an unique code. CDMA offers improved spectral efficiency over analog transmission in that it allows for greater frequency reuse. Other characteristics of CDMA systems reduce dropped calls, increase battery life and offer more secure transmission. See also IS-95. Channel trace data is displayed at one Point-per-Symbol and all Composite trace data is displayed at one Point per Chip. This causes the bandwidth displayed for the ,, and the to be less than the VSA's span setting.
The following topics may help optimize your measurements and explain the reasons for changes made automatically by the VSA:
Measurement Speed Considerations
See Also
