Despread Traces (W-CDMA(3GPP)/HSPA)

Default: Normal (See W-CDMA(3GPP) Standard Setups/Presets Table.)

The Despread Channel - Despread Traces specifies the measurement Test Plane within the HSPA+MIMO Multiple Input, Multiple Output: A physical layer (PHY) configuration in which both transmitter and receiver use multiple antennas. analysis signal flow for the Despread (x) category of Trace Data results, where (x) is the Despread category number (Despread 1, Despread 2, Despread (x)). Refer to the Available Trace Data (W-CDMA(3GPP)/HSPA) topic for list of Despread (x) Channel Trace Data. .

The Despread Traces parameter is only available for HSPA+MIMO, 16 (240.0 ksym/s) signals - 2 (or greater) Antenna MIMO analysis, see Making a HSPA+MIMO Measurement.

How to Make a HSPA+MIMO Despread (x) Trace Data measurement

To learn how to use the Despread Traces parameter to make a Despread (x) Channel Trace Data measurement, see HSPA+ MIMO Overview - Despread (x) Trace Data.

How to use the Despread Traces Parameter

To select a particular Despread (x) Category Trace Data result, first determine the appropriate HSPA+MIMO measurement Test Plane for the desired Despread (x) Trace Data result. Then use the "Despread Traces" property to configure the VSA for the measurement. The HSPA+MIMO Trace Mapping Diagram and Test Plane Location Mapping Table are used to determine the correct Despread measuremen HSPA+MIMO Test Plane. Go to the d topic for complete details about using the Despread Traces parameter to make Despread (x) Channel measurements

The Despread Traces Parameter Table is used to determine the correct Despread Traces parameter "HSPA+MIMO Test Plane" for a particlular Despread (x) Trace Data result. Use the reference and HSPA+ MIMO Trace Mapping Diagram to identify the Despread Trace Data measurement Test Plane Location for the desired Despread (x) Trace Data result.

Despread Traces Parameter Table

Despread Traces Parameter	Despread 1 (Meas Test Plane Ref⁽²⁾)	Despread 2 (Meas Test Plane Ref⁽²⁾)
Normal⁽¹⁾	D1	D2
HS TrBlock	E1	E2
HS TrBlock1 per Antenna	F1	F2
HS TrBlock2 per Antenna	G1	G2
Notes (1) When Normal is selected, the Despread 1 traces map to the legacy "Channel 1 Chan" traces, and represent the measured data immediately after removing the orthogonal spreading code for a specific code channel (2) To view the measurement Test Plane Location within the HSPA+MIMO signal flow, locate the Meas Test Plane Reference in the HSPA+ MIMO Trace Mapping Diagram.

Despread Traces property is only available for Downlink HSPA+MIMO Spread Code Length 16 (240.0 ksym/s), > 1 Antenna analysis.

Configure the VSA for HSPA+MIMO Analysis

To configure the VSA for Downlink HSPA+MIMO, Spread Code Length 16 (240.0 ksym/s), >1 Antenna measurement analysis, set the following VSA parameters:

Select Downlink Direction: MeasSetup > W-CDMA (3GPP)/HSPA Demod Properties > Format tab > Direction > Downlink
Select Enable HSPA Analysis: MeasSetup > W-CDMA (3GPP)/HSPA Demod Properties > Format tab > Enable HSPA Analysis
Select Number of Tx Antennas of 2 (or more): MeasSetup > W-CDMA (3GPP)/HSPA Demod Properties > Format tab > Number of Tx Antennas > 2
Specify Spread Code Length to 16 (240.0 ksym/s: MeasSetup > W-CDMA (3GPP)/HSPA Demod Properties > Channel/Layer tab > Spread Code Length > 16 (240.0 ksym/s