MT Map PAM Symbols to Bits

Maps complex-valued PAM symbols to an output bit stream based on a user-specified symbol map.

1378

Inputs/Outputs

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symbols

The incoming complex-valued symbols to be mapped to the output bit stream based on the symbol map.

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symbol map

An ordered array that maps each symbol value to its desired coordinates in the complex plane.

The number of PAM states in the array must be 2N, where N is the number of bits per symbol. The length of the vector for the symbols farthest from the origin must be 1. To specify a prebuilt map, unbundle the symbol map element from the PAM system parameters cluster generated byMT Generate PAM System Parameters (M) or MT Generate PAM System Parameters (map).

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error in

Error conditions that occur before this node runs.

The node responds to this input according to standard error behavior.

Standard Error Behavior

Default value: No error

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output bit stream

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

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error out

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

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
log⁡2(M)
with M representing the size of the modulation scheme. For example, in a 256-QAM system, 500 QAM symbols are mapped to
(500)×log⁡2(256)=4000⁢⁢  message⁢   bits
.