Subchannel Index (802.16 OFDM)

Default: 16 (all subcarriers active) (See 802.16 OFDM Standard Setups/Presets Table.)

The Subchannel Index parameter controls analysis of 802.16-2004 uplink subchannels. When demodulating a 802.16 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. signal, the VSA checks for several different kinds of preambles, including Long preamble (found on Downlink subframes), Short preamble (found on most Uplink bursts), and a Subchannel preamble (found on Uplink subchannel bursts). The type of preamble found determines the type of demodulation that is done. However, there are 31 different possible uplink subchannels specified in the 802.16-2004 standard, so the VSA checks for only one of the possible subchannels. The Subchannel Index parameter controls which of the subchannels the VSA checks for. The default value is 16, which is a subchannel that uses all 200 subcarriers.