Technical data

536 Chapter 19
W-CDMA or W-CDMA (with HSDPA) Analyzer
Using the W-CDMA or W-CDMA (with HSDPA) Analyzer
W-CDMA or W-CDMA (with HSDPA)
Analyzer
Using the W-CDMA or W-CDMA (with HSDPA)
Analyzer
W-CDMA and W-CDMA (with HSDPA) transmitter measurements verify proper
transmitter performance of a Base Station (commonly referred to as a Node B) and
are typically made with the base station out-of-service in test mode. Non-intrusive
measurements can also be made on a live network if a monitor or test port is present.
This is usually a coupled port, with power levels that are –20 or –30 dB down from
the main Tx output power RF path. The power levels on the main Tx output power
path can exceed 10 Watts. Important metrics include:
• Frequency Error
• Error Vector Magnitude (EVM)
• Peak Code Domain Error (PCDE)
• Channel Power
• Carrier Feedthrough
• Code Domain Noise Floor
• CPICH Power
• Delta Powers between CPICH (Common Pilot Channel) and P-CCPCH
(Primary Common Control Physical Channel), S-CCPCH (Secondary Common
Control Physical Channel), PICH (Paging Indicator Channel), P-SCH (Primary
Synchronization Channel) and S-SCH (Secondary Synchronization Channel).
These latter measurements are all performed in the “Code Domain” and are
sometimes referred to as Code Domain Power (CDP) measurements.
One of the defining elements of a 3G system is high-speed data transmission. The
3GPP standard allows for multiple data rates depending on the application. This
flexibility requires complex processing in both the transmitter and receiver to retain
information quality and still transfer a variety of user information in the noisy
spread spectrum environment. The CDP measurements allow you to quickly verify
the operation of a 3GPP transmitter. In addition, it can give a high-level evaluation
of modulation quality, channel power, and signal-to-noise in the code domain.
High Speed Downlink Packet Access (HSDPA) was added in Release 5 of the 3GPP
specifications. HSDPA was added in an attempt to make the W-CDMA systems
more efficient for packet data applications by increasing peak data rates and
reducing packet latency. You will need Option 245 - HSDPA Analyzer & HSDPA