Format Tab (W-CDMA(3GPP)/HSPA)
The tab of the 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.(3GPP)/HSPA Demod Properties dialog box configures the VSA's W-CDMA(3GPP) demodulator. These are the parameters necessary for the VSA to lock on to and demodulate the test signal.
The tab dialog box configures these parameters:
- Antenna-2 Synchronization Type (Downlink only)
- Antenna-2 CPICH Common Pilot Channel
- S-CPICH
- Code Channel
- Number of Tx Antennas (Downlink and Enable HSPA Analysis)
-
Scramble parameters:
-
Scramble Offset (Downlink only)
-
Scramble Type parameter (Downlink only):
-
Standard
-
Left
-
Right
-
-
Synchronization Type parameters:
- CPICH (Downlink only)
- SCH (Downlink only)
- Antenna-2 CPICH (Downlink only)
- Symbol (Downlink only):
- Spread Code Length
- Code Channel
- Pilot-aided Timing Estimation (Downlink only)
- DPCCH (Uplink only)
- Slot Format
- PRACH Message (Uplink only)
- Auto Preamble Signature
- Manual
- Synchronization Start Slot
- Automatic
- Manual
See Also
Advance tab (W-CDMA (3GPP)/HSPA Demod Properties)
Channel/Layer tab (W-CDMA (3GPP)/HSPA Demod Properties)
Test Mode tab (W-CDMA (3GPP)/HSPA Demod Properties)
