# MT Map FSK Symbols to Bits (G Dataflow)

Maps symbols comprised of Frequency Shift-Keying (FSK) frequency deviations to an output bit stream based on the symbol map that you specify.

##### Programming Patterns
Use this node in conjunction with MT Matched Filter, MT Align to Ideal Symbols, MT Decimate Oversampled Waveform, and MT Calculate BER to perform waveform analysis on the modulated waveform.
Note

The mapping of symbols to bits depends on the number of bits per symbol, which equals ${\mathrm{log}}_{2}\left(M\right)$ with M representing the size of the modulation scheme. For example, in a 256-QAM system, 500 QAM symbols are mapped to $\left(500\right)×{\mathrm{log}}_{2}\left(256\right)=4000\text{\hspace{0.17em}}\text{\hspace{0.17em}}message\text{\hspace{0.17em}}\text{\hspace{0.17em}}\text{\hspace{0.17em}}bits$.

## symbols

An array of frequency deviations for one-to-one mapping to the output bit stream.

## symbol map

An ordered array that maps each symbol value to its desired deviation frequency.

The number of FSK levels in the array must be 2 N , where N is the number of bits per symbol. To specify a prebuilt map, unbundle the symbol map element from the FSK system parameters cluster generated by MT Generate FSK System Parameters (M) or MT Generate FSK System Parameters (map).

## error in

Error conditions that occur before this node runs. The node responds to this input according to standard error behavior.

Default: no error

## output bit stream

A bit stream with a one-to-one mapping to the input symbols based on the specified symbol map.

## error out

Error information. The node produces this output according to standard error behavior.

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported