EGPRS Demodulation Type
Last updated: September 1, 2009
This section is only applicable to the EGPRS test application.
The EGPRS Demodulation Type setting allows you to select among reduced, normal and periodic demodulation.
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In Normal mode, the test set demodulates all the uplink data.
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In Reduced mode, the test set samples and demodulates the uplink data in a fixed reduced rate. This can make the transmitter measurement faster. However, it is not enough to maintain a connection between the mobile station and the test set (especially for multislots 8PSK uplink data) in reduced mode
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In Periodic mode, the test set adjusts the maximum demodulation rate automatically to keep the data connection meanwhile demodulate the least uplink data. By selecting the periodic demodulation type, the test set has faster speed to measure 8PSK signal, it becomes more obvious when the uplink burst number is large, e.g. Class 12 or DxU4. There is no impact to GMSK uplink data in Periodic mode.
Note that the periodic mode is only applicable when the uplink MCS is set to MCS5 to MCS9.
Operating Considerations
EGPRS Demodulation Type can be configured when the operating modes are Active Cell (EGPRS), EGPRS BCH+PDTCH and EGPRS BCH+PDTCH+TCH.
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When the operating mode is Active Cell (EGPRS) and the data connection type is NOT Auto or BLER, all the three demodulation types can be selected.
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When the operating mode is EGPRS BCH+PDTCH or EGPRS BCH+PDTCH+TCH and any one of GBER, BLER or SBER measurement is started, Normal mode is used internally whatever the EGPRS Demodulation type is.
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When the operating mode is EGPRS BCH+PDTCH or EGPRS BCH+PDTCH+TCH and GBER, BLER and SBER measurements are all closed, Reduced mode is used internally whatever the EGPRS Demodulation type is. (The Burst Timing Error will not be reported in this case.)
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When a call processing function needs to be performed or a receiver measurement is being made, the test set will automatically switches to Normal whatever the EGPRS Demodulation type is.