Multiple Access Scheme (Custom OFDM)

MeasSetup > Custom OFDM Demod Properties > Format tab

This parameter is shown in the Frame Definition tab and the Format tab. When Frame Definition > Apply is clicked, the value in the Frame Definition tab is applied to the Format tab (and the signal).

Default: None

Range: None, SCMA, NOMA, DFT discrete Fourier transform

Multiple Access Scheme specifies how multiple transmitters may simultaneously use the same frequency/time/signal path. These transmitters inherently interfere with each other, but several schemes have been developed which allow the individual transmitter signals to be isolated by the receiver.

When analyzing a signal that uses multiple access, the separate interfering transmitted signals are not displayed in the demodulated traces like 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. IQ Meas and OFDM IQ Ref. Instead, these traces contain the combination of the two interfering transmitted signals. This allows the overall 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. to be calculated accurately, but does not provide individual bit values for each of the two interfering transmitted signals.

See Also

Multiple Access tab

Custom OFDM Demod Properties Dialog Box