FBMC Settings (Custom OFDM)
The FBMC Settings are used to configure 5G demodulation over Custom OFDM Orthogonal Frequency Division Multiplexing: OFDM employs multiple overlapping radio frequency carriers, each operating at a carefully chosen frequency that is Orthogonal to the others, to produce a transmission scheme that supports higher bit rates due to parallel channel operation. OFDM is an alternative tranmission scheme to DSSS and FHSS.. When the Modulation Scheme is set to FBMC, the FBMC Settings section of the Multiple Access tab control the FBMC filter that is used.
| Parameter | Description | ||||||||||||||
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Sets the overlap factor (K) when using the FBMC modulation scheme. The Filter Overlap Factor (K) controls the number of filter coefficients. The total number of coefficients for the entire filter is K*2 - 1. For example, if the Filter Overlap Factor (K) is set to 4, then there are a total of 7 coefficients – one in the center and three on each side of the center. Default: 4 |
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Sets the frequency-domain filter coefficients when using the FBMC modulation scheme. These are the filter coefficients that the transmitter applied to the signal, one value per OFDM symbol. The filter is assumed to be symmetrical around t=0, so only the values starting at t=0 are here. This is an array of values whose length must be equal to the Filter Overlap Factor (K). If the array is longer, the extra values are thrown away. If the array is shorter, zeros are filled in automatically. These are frequency-domain values, as applied to the frequency-domain OFDM signal. Whenever the value of Filter Overlap Factor (K) changes, the Frequency-Domain Filter Coefficients are set to default values. For common values of K, the default values are the standard FBMC filter values for that value of K, and are given in the following table:
Default: 1, 0.9719598, 0.7071068, 0.235147 |
See Also
