Tektronix NetTek YBT250, Руководство пользователя

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Glossary
Glossary- 4
YBT250 Field Transmitter & Interference Tester User Manual
Pilot Power. The Pilot Power is the absolute power of the pilot
channel (Walsh Code 0) in a CDMA channel. For W-CDMA,
the Pilot Power is the absolute power of the Primary Common
Pilot Channel (P-CPICH). The primary common pilot channel
is used as a phase reference for many channels and to identify
the primary scrambling code.
Pilot Time Alignment Error (Tau). The Pilot Time Alignment Error is
the difference in timing between the pseudo noise (PN)
sequences and the CDMA system time.
PN Offset. PN Offset is the coarse timing difference between the
pilot channel and the even-second clock.
PNG -- Graphics File Format. PNG, an acronym for Portable Network
Graphics, is one of the file formats available for saving screen
captures. PNG is a new format developed primarily for use on
the World Wide Web. PNG files are usually much smaller than
BMP files. The filename extension is .png.
RF Channel Power. RF Channel Power is the total RF power in the
selected channel. This measurement assumes a 50 ohm nominal
impedance.
Reference Level. The power level at the top of a spectrum window.
Reverse Frequency. The frequency the mobile unit uses to transmit to
the base station. Also called uplink frequency, reverse channel
or uplink channel.
Scrambling Code. There are 512 primary scrambling codes available
in a W--CDMA system, numbered from 0 to 511, which are used
to uniquely identify each downlink signal. All code channels in
a downlink signal, with the exception of the primary (P--SCH)
and secondary (S--SCH) synchronization channels, are
scrambled by either the primary scrambling code, or one of the
15 secondary scrambling codes associated with each primary
scrambling code. The YBT250 decodes only the primary
scrambling code of each signal, not the secondary scrambling
codes.