Suppress SCH for channel measurements (W-CDMA(3GPP)/HSPA)
Selected (SEe W-CDMA(3GPP) Standard Setups/Presets Table.)
specifies whether the non-orthogonal SCH and the resulting leakage power is removed from channel analysis measurements. This function improves symbol EVM Error vector magnitude (EVM): A quality metric in digital communication systems. See the EVM metric in the Error Summary Table topic in each demodulator for more information on how EVM is calculated for that modulation format., magnitude error and phase error measurement accuracy.
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Suppress (remove) SCH data from channel measurements. |
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Include SCH data in channel measurements. |
The SCH Synchronization Channel may cause significant increase in symbol EVM and other symbol power vs. time measurements. SCH is non-orthogonal to other Code Channels, this can raise the code domain noise floor and degrade EVM. To correct this, the P-SCH and S-SCH are demodulated first. Then their combined signal is subtracted from the incoming signal before any other channels are demodulated. The effect of SCH suppression will result in less noise in the Despread Channel Error Vector Time results, improved EVM, and better constellation symmetry.
See Also
