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3. Dirty Transmitter

State

Choice: On | Off

Default: Off

Double-click or use the drop-down menu to enable or disable the dirty transmitter test. When this setting is set to On, the Dirty Transmitter Impairments Setup Table appears.

Turning on dirty transmitter will automatically disable 'Packet ' node.

Omit Poll Period

Choice: On | Off

Default: Off

Double-click or use the drop-down menu to select whether to omit the poll period in the dirty transmitter test.

In Bluetooth systems, master and slave devices exchange information by alternating packet transmission in TDD mode. The poll period is used to simulate the time period when the other Bluetooth device would be transmitting its packets. Enabling Omit Poll Period allows for verification setups where the Bluetooth TDD mode can be ignored; instead the signal source will create Bluetooth packets for every time slot. It is beneficial when comparing results against normal TDD mode to determine the effects of LO switching, or for comparing other state machine transitions. In characterizing receiver performance, or for high-speed verifications.

The figure below shows the timing diagram for each of the three packet types. The poll period is 625 microseconds long, during which time no data is transmitted. The Omit Poll Period is transmitted before each packet type, unless omit period is enabled. The amount of poll period(s) for each packet type is as follows:

Figure 1. Timing diagram for test set for each packet type          

Date Rate

Choice: Basic | 2Mbps | 3Mbps

Default: Basic

Double-click or use the drop-down menu to select the packet data rate applied to the dirty transmitter test.

Data is transmitted over the air in packets. Two modulation modes are defined: a mandatory mode called Basic Rate and an optional mode called Enhanced Data Rate. The symbol rate for all modulation schemes is 1 Ms/s. The gross air data rate is 1 Mbps for Basic Rate. Enhanced Data Rate has a primary modulation mode that provides a gross air data rate of 2 Mbps, and a secondary modulation mode that provides a gross air data rate of 3 Mbps.

Packet Type

Choice: DH1 | DH3 | DH5 | 2-DH1 | 2-DH3 | 2-DH5 | 2-EV3 | 2-EV5 | 3-DH1 | 3-DH3 | 3-DH5 | 3-EV3 | 3-EV5

Default: DH1

Couplings: The available Packet Types are determined by the Data Rate.

Double-click or use the drop-down menu to select the packet type used for the dirty transmitter test.

Payload Data Mode

Choice: Truncated | Continuous

Default: Truncated

Double-click or use the drop-down menu to select the payload data mode applied to the dirty transmitter test.

Dirty Transmitter Test Sets

Use the Pre-defined button to open a Closeddrop-down menu for selecting the pre-defined dirty transmitter profile. Clicking a configuration replaces the current configuration in the setup table. For more parameter settings, see the Closedtest profile table.

Use the Add button to add a new dirty transmitter set. When a new impairment set is added, The set is inserted in the table..

Use the Delete button to delete the selected impairment set. The set to be deleted is indicated by the in the first column.

Use the Copy button to add a new impairment set that has the same configuration as the currently selected one (indicated by the in the first column).

Use the Up and Down arrows to reposition the currently selected set (indicated by the in the first column).

Index

This cell displays the impairment set index number.

State

Use this cell to enable or disable a specified impairment set in dirty transmitter test.

Frequency Offset [kHz]

Range: -200 to 200kHz

Use this cell to set the static offset to the carrier frequency.

Modulation Index

Range: 0.05 to 0.95

Use this cell to set the modulation index of GFSK.

Symbol Timing Error [ppm]

Range: -50 to 50

Use this cell to set the shift of standard symbol rate.