Project (Uplink)

This topic describes the parameters of the uplink Project Property setup table, which is accessible when you click Project in the tree view.

 

Basic ESG

Frequency (Hz)

Range: for specified range values, see the signal generator's data sheet

This cell sets the carrier frequency on the ESG. This frequency value also appears in the status bar at the bottom of the main window.

Amplitude (dBm)

Range: for specified range values, see the signal generator's data sheet

This cell sets the carrier amplitude on the ESG. This amplitude value also appears in the Max Power (dBm) field in the Tx Power Control node, and in the status bar at the bottom of the main window.

Application Mode

Choice: Off, On
Default: On

This cell sets the modulation to ON or OFF. ON modulates the carrier with the current software signal parameters.

RF Output

Choice: Off, On
Default: On

This cell sets the RF output of the ESG to ON or OFF. ON outputs the signal at the ESGs RF OUTPUT connector.

 

Basic Project

Project Name

Use this cell to enter a project name for a signal configuration. The alphanumeric text entered in this cell appears in the ESG user interface after the configuration is downloaded to the instrument. The ESG only recognizes configurations that use the following alphanumeric characters:

If unsupported alphanumeric characters appear in a configuration name, the ESG generates a file name not found error (Error: -256) when you download the configuration to the instrument. The maximum length for file names is 8 characters.

Project Comment

Use this cell to enter project comments for a configuration file. If you save the Signal Studio configuration, the information you enter can be useful to anyone using the configuration in the future. This information is not downloaded to the ESG. The maximum length for comments is 32 characters.

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General (3GPP)

Scrambling Code

Range: 0–16777215
Default: 0

This cell sets the uplink scramble code number The scrambling code provides a unique signature for the base station.

Chip Rate

Range: 0.240000 to 4.224000 Mcps
Default: 3.840000 Mcps

This cell sets the chip rate (in units of samples). To allow for flexibility in various stages of design verification, the chip rate can be set from .2400 to 4.224 Mcps (1/16 to 11/10 times the rate of the chip clock).

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I/Q Baseband

I/Q Phase Polarity

Choice: NORMAL, INVERTED
Default: NORMAL

Use this cell to invert the internal Q signal, reversing the rotation direction of the phase modulation vector.

NORMAL

The phase relationship between the I and Q signals are not altered by the phase polarity function.

INVERTED

This causes the in-phase component (I) to lag the quadrature-phase component (Q) by 90 degrees in the resulting modulation. Inverted phase polarity is required by some radio standards, and it is useful for lower sideband mixing applications. The inverted selection also applies to the I, I-bar, Q, and Q-bar output signals on the ESG.

BBG Clock Reference

Choice: External, Internal
Default: Internal

This cell sets the active source for the baseband generator data clock.

External

This sets the ESG to use an external data clock as its data clock input. A data clock must be supplied through the DATA CLOCK input connector when external mode is selected.

Internal

This sets the instrument to use the internal data clock as its data clock input.

 BBG Clock Rate

Choice: X1, X2, X4
Default: X1

This cell sets the external clock rate, which is used to synchronize to the base station (BTS) chip clock. Since the BTS chip clock may be a multiple of 3.84 MHz, the signal generator divides the input rate by the selected multiple to obtain the 3.84 MHz chip clock.

X1

3.84 MHz external clock

X2

7.68 MHz external clock (2x the rate of the chip clock)

X4

15.36 MHz external clock (4x the rate of the chip clock)

 

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I/Q Filter

Filter Type

Choice: Root Nyquist, Nyquist, Gaussian, Rectangle, IS95, IS95 w/EQ, IS95 Mod, IS95 Mod w/EQ, APCO 25 C4FM, UN 3/4 GSM Gaussian, User
Default: Root Nyquist

This cell sets the baseband filter type. When you click the cell, a drop-down arrow provides access to the filter Data Type Entry window where you can select from a variety of filters or you can select USER, which activates the USER FIR Editor, enabling you to configure or import a custom FIR filter.

Nyquist Alpha

Range: 0–1
Default: 0.22

This cell sets the filter's alpha value. It is only valid for Nyquist filters. It is only valid for root Nyquist and Nyquist filters.

Gaussian BbT

Range: 0–1
Default: 0.5

This cell sets the filter's BbT value. It is only valid for a Gaussian filter.

Optimized for

Choice: EVM, ACP
Default: EVM

This cell optimizes the selected filter for improved EVM or ACP. It is only valid for root Nyquist and Nyquist filters.

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SYNC

Frame clock interval

Range: 10, 20, 40, 80, 2560
Default: 80

This cell sets the frame clock interval for the synchronization signal. When using the frame clock, choose an interval that is equal to or longer than that of the longest transport channel TTI period.

Frame clock polarity

Choice: Positive, Negative
Default: Positive

This cell sets the polarity of the frame clock signal.

Negative

The signal generator frame clock timing uses the falling edge of the frame clock signal.

Positive

The signal generator frame clock timing uses the rising edge of the frame clock signal.

SFN-CFN offset

Range: 0–255
Default: 0

This cell sets the SFN-CFN frame offset. This offset adds a delay to the frame counter by specifying the starting frame number. Frame 0 starts with the system sync trigger reset signal when the frame offset is set to zero. For example, if the frame offset is set to two, the signal generator counter starts 2 frames after the system sync trigger.

Timeslot offset

Range: 0–119
Default: 0

This cell sets the number of timeslots to delay the DPCH from the synchronization source.

Timing offset

Range: –512 to 2560
Default: 0

This cell sets the timing offset between the DPCH (DPDCH and DPCCH) and the HS-DPCCH.

SFN Reset signal polarity

Choice: Positive, Negative
Default: Positive

This cell sets the polarity of the SFN reset signal for uplink synchronization.

Negative

The signal generator responds to a falling edge reset signal.

Positive

The signal generator responds to a rising edge reset signal.

Synchronization triggering mode

Choice: Single, Continuous
Default: Single

This cell sets the frame synchronization trigger mode.

Single

The signal generator generates frames based on the reference clock.

Continuous

The signal generator continuously aligns the sync signal with frame timing.

Synchronization source type

Choice: SFN_ RST, FrameClock
Default: FrameClock

This cell sets the frame synchronization source.

SFN_RST

The system frame number reset signal is the synchronization source.

FrameClock

The frame clock signal is the synchronization source.

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