MT Map CPM Symbols to Bits
- Updated2023-02-17
- 4 minute(s) read
MT Map CPM Symbols to Bits
Maps symbols comprised of CPM frequency deviations to an output bit stream based on the symbol map that you specify.
Inputs/Outputs
symbols
An array of frequency deviations for one-to-one mapping to the output bit stream.
symbol map
A two-dimensional array of desired frequency deviations.
Each column corresponds to a symbol, with the binary representation of the column index being the mapped bit-representation of the symbol. Each row corresponds to a modulation index in the order in which it appears in the modulation index, h(i) parameter of MT Generate CPM System Parameters (M) or MT Generate CPM System Parameters (map). To specify a prebuilt map, unbundle the symbol map element from the CPM system parameters cluster generated by MT Generate CPM System Parameters (M) or MT Generate CPM System Parameters (map).
Default value: empty array
synchronization parameters
Parameter values describing the synchronization sequence and the range of bits over which to search for the sequence. Wire the CPM synchronization parameters cluster returned by MT Generate CPM Synchronization Parameters (bit array) or MT Generate CPM Synchronization Parameters (number array) to this cluster.
expected sync location
The expected location of the first symbol of the sync sequence.
This value is an index to the input complex waveform. A value of -1 searches the entire input complex waveform and ignores the sync location uncertainty parameter.
sync sequence
The mapped symbol pattern. Although the data type is complex, only the real portion is used.
The real portion of the mapped symbols is the frequency deviation of the symbol value, and the imaginary portion is 0. To prevent false synchronization, configure this pattern so that there is a low probability of accidental correlation to nonsynchronized parts of the data stream. If this parameter is left empty, the signal is still demodulated.
sync location uncertainty
Number of symbols before or after the expected sync location where the first symbol of the sync sequence may be located. The node ignores this parameter if the expected sync location parameter is set to -1.
Default value: 10
sync indent
Distance that the sync sequence is indented into the information block.
The distance is the number of demodulated symbols preceding the sync sequence. For example, a value of 10 indicates that the output bit stream consists of 10 data symbols, followed by the sync sequence, followed by the remaining data symbols.
Default value: 0
error in
Error conditions that occur before this node runs.
The node responds to this input according to standard error behavior.
Default value: 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.