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NIWLANG_GUARD_INTERVAL_TYPE

NI WLAN Generation Toolkit 17.0 Help

Edition Date: May 2017

Part Number: 373725G-01

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Data Type: int32
Access:read/write
Functions:niWLANG_SetScalarAttributeI32
niWLANG_GetScalarAttributeI32
Description: Specifies the type of guard interval (cyclic prefix) in an OFDM symbol.

If you set the NIWLANG_STANDARD attribute to NIWLANG_VAL_STANDARD_80211N_MIMO_OFDM or NIWLANG_VAL_STANDARD_80211AC_MIMO_OFDM, the NIWLANG_VAL_GUARD_INTERVAL_TYPE_ONE_BY_FOUR is 0.8 microseconds, and the NIWLANG_VAL_GUARD_INTERVAL_TYPE_ONE_BY_EIGHT is 0.4 microseconds.
If you set the NIWLANG_STANDARD attribute to NIWLANG_VAL_STANDARD_80211AH_MIMO_OFDM, the NIWLANG_VAL_GUARD_INTERVAL_TYPE_ONE_BY_FOUR is 8 microseconds, and the NIWLANG_VAL_GUARD_INTERVAL_TYPE_ONE_BY_EIGHT is 4 microseconds.
If you set the NIWLANG_STANDARD attribute to NIWLANG_VAL_STANDARD_80211AF_MIMOOFDM, and the bandwidth to 6 MHz or 7 MHz, NIWLANG_VAL_GUARD_INTERVAL_TYPE_ONE_BY_FOUR is 6 microseconds, and the NIWLANG_VAL_GUARD_INTERVAL_TYPE_ONE_BY_EIGHT is 3 microseconds.
If you set the NIWLANG_STANDARD attribute to NIWLANG_VAL_STANDARD_80211AF_MIMOOFDM, and the bandwidth to 8 MHz, the NIWLANG_VAL_GUARD_INTERVAL_TYPE_ONE_BY_FOUR is 4.5 microseconds, and the NIWLANG_VAL_GUARD_INTERVAL_TYPE_ONE_BY_EIGHT is 2.25 microseconds.
If you set the NIWLANG_STANDARD attribute to NIWLANG_VAL_STANDARD_80211AX_MIMO_OFDM, the NIWLANG_VAL_GUARD_INTERVAL_TYPE_ONE_BY_FOUR is 3.2 microseconds, the NIWLANG_VAL_GUARD_INTERVAL_TYPE_ONE_BY_EIGHT is 1.6 microseconds, and the NIWLANG_VAL_GUARD_INTERVAL_TYPE_ONE_BY_SIXTEEN is 0.8 microseconds.

The default value is NIWLANG_VAL_GUARD_INTERVAL_TYPE_ONE_BY_FOUR.

Set Function: niWLANG_SetGuardIntervalType
Get Function: niWLANG_SetGuardIntervalType
Values:
NIWLANG_VAL_GUARD_INTERVAL_TYPE_ONE_BY_FOUR (0)Specifies that guard interval length is equal to one-fourth of IDFT/DFT period.
NIWLANG_VAL_GUARD_INTERVAL_TYPE_ONE_BY_EIGHT (1)Specifies that guard interval length is equal to one-eighth of IDFT/DFT period.
NIWLANG_VAL_GUARD_INTERVAL_TYPE_ONE_BY_SIXTEEN (2)Specifies that guard interval length is equal to one-sixteenth of the IDFT/DFT period.

 

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