Agilent Technologies ESG Specifikace stáhnout pdf (Strana 229)

Fully Coded 3GPP W-CDMA Personality User’s and Programming Guide 4-21

ESG Family Signal Generators Operation

Option 200 Understanding the Two-ESG Downlink Configuration

Understanding the Two-ESG Downlink Configuration

Capabilities

The two-ESG downlink configuration provides a 3GPP solution in situations where more

than four fully coded W-CDMA channels are required. Using two ESG signal generators,

Option 200 utilizes the combination of both baseband generators to build the W-CDMA

waveforms required to test 3GPP user equipment designs.

The Option 200 3GPP setup provides the following downlink channel types:

• primary synchronization channel (PSCH)

• secondary synchronization channel (SSCH)

• primary common control physical channel (PCCPCH)

• common pilot channel (CPICH)

• dedicated physical channel (DPCH)

• paging indicator channel (PICH)

• orthogonal channel noise simulator (OCNS)

In a typical two-ESG setup, the baseband generator from one ESG provides a control

configuration (PSCH, SSCH, PCCPCH, and CPICH) while the other provides an

information data transmission configuration (DPCH and PICH, with optional OCNS).

Fully coded and channelized W-CDMA signals are available at the RF outputs of both

ESGs.

For valid channel type/channel number, see “Valid Channel-Type-to-Channel-Number

Assignments” on page 4-7. For valid channel combinations, see “Valid Channel

Combinations per ESG” on page 4-7.

System Functionality

Separate sections of the 3GPP frame are generated by separate baseband generators, one

within ESG 1 and another within ESG 2. The two sections of the frame are then combined

at the I/Q inputs of both ESGs and modulated to the carrier by the RF section within each

ESG. After carrier frequency and amplitude are introduced, the fully coded and

channelized 3GPP signals are output to the DUT(s) through the RF output of both ESGs.

An external function generator is used to supply the chip clock. See Figure 4-5.

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Agilent Technologies ESG Specifikace Strana 229