Modulation Coding Scheme/Puncturing Scheme (MCS/PS)

Last updated: December 2, 2008

This section is only applicable to EGPRS when the test set's operating mode is EGPRS BCH + PDTCH.

Different modulation coding scheme / puncturing scheme (MCS/PS) values can be assigned to each downlink of a multislot burst if the operating mode is set to EGPRS BCH+PDTCH.

Modulation Coding Scheme / Puncturing Scheme Options

The MCSs are grouped by modulation type. MCS-1 through MCS-4 use GMSK modulation, while MCS-5 through MCS-9 use 8PSK modulation. The differences in data rates within these groups of MCSs is affected by the different modulation types in conjunction with puncturing and coding schemes. The amount of coding used for different MCSs decreases as the MCS number increases. Therefore, MCS-1 has the greatest amount of coding and the slowest data rate while MCS-4 has less coding and a higher data rate. MCS-9 doesn't use as much coding as MCS-5, 6, 7, or 8 and coupled with 8PSK modulation, achieves the highest data rate of all the MCS used by EGPRS.

You may specify a MCS/PS for each downlink burst in a multislot configuration. The following list contains all the MCS/PS available. The GPIB commands to assign separate MCS/PS to individual bursts are CALL:(PDTCH|PDTChannel):MCSCheme:EBPTest[:BURSt1] and CALL:(PDTCH|PDTChannel):MCSCheme:EBPTest:BURSt<2|3|4|5> .

GMSK / 8PSK Options

Modulation coding schemes MCS1 through MCS4 use GMSK modulation while MCS5 to MCS9 use 8PSK modulation. The set of puncturing schemes available is different across different modulation coding schemes are shown in the table below.

Modulation Coding Scheme (MCS)

Data Rate

(kb/s)

Puncturing Scheme 1

(PS1)

Puncturing Scheme 2 (PS2)

Puncturing Scheme 3 (PS3)

MCS 1 8.8 Yes Yes No

MCS 2 11.2 Yes Yes No

MCS 3
14.8 Yes Yes Yes

MCS 4 17.6 Yes Yes Yes

MCS 5 22.4 Yes Yes No

MCS 6 29.6 Yes Yes No

MCS 7 44.8 Yes Yes Yes

MCS 8 54.4 Yes Yes Yes

MCS 9 59.2 Yes Yes Yes

NOTE

Modulation Coding Schemes MCS7-MCS9 allow two data blocks to be embedded in each radio block. These data blocks can have the same or different puncturing schemes. For example, if you choose MCS9 PS 3-2 from the MCS / PS menu of the front panel, the test set uses MCS 9, with puncturing scheme 3 on the first data block and puncturing scheme 2 on the second data block. For more information, see How Do I Assign Different Modulation Coding Schemes / Puncturing Schemes to Each Downlink of a Multislot Burst? .

8PSK ClearCoded

When 8PSK ClearCoded is selected, no encoding is performed on the downlink. The GPIB command mnemonic for 8PSK ClearCloded is EPSKCC.
As Burst 1

The As Burst 1 setting of this parameter uses the modulation coding scheme and puncturing scheme is assigned to the first burst of the multislot downlink. The As Burst 1 setting cannot be assigned to burst 1 of the multislot downlink. The GPIB command mnemonic for 8PSK ClearCloded is EPSKCC.

Operating Considerations

In order to assign different modulation coding schemes and puncturing schemes to each burst in a multislot downlink, the operating mode must be set to EGPRS BCH+PDTCH or EGPRS BCT+PDTCH+TCH.

Modulation Coding Scheme/Puncturing Scheme (MCS/PS)

Modulation Coding Scheme / Puncturing Scheme Options

Operating Considerations

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