Symbol Time Adjustment (MB-OFDM)

Default: -1 clocks (See MB-OFDM Standard Setups/Presets Table.)

Range: 0 to -10 clocks

Symbol Time Adjustment adjusts where the FFT Fast Fourier Transform: A mathematical operation performed on a time-domain signal to yield the individual spectral components that constitute the signal. See Spectrum. is positioned within the symbol. The transmitted symbol is created by appending a zero-padded suffix to the MB-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. symbol. This zero-padded suffix provides a time window (a guard interval) to allow sufficient time for the transmitter and receiver to switch between the different center frequencies. A symbol is defined as an MB-OFDM symbol plus a zero-padded suffix. The Symbol Time Adjustment parameter moves the FFT within the symbol.

The number of samples in the zero-padded suffix is 37 and zero-padded suffix duration in time is 70.08 ns as specified in the standard. (See About Opt BHB: Multiband-OFDM.).

The Symbol Time Adjustment can be set from 0 to -10 clocks with the most consistent results obtained at an offset of -1 nominally (the default).