Modulate Vector

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Modulate a vector of data and apply a shaping filter.

This function modulates the input vector and applies a symbol shaping filter. It is intended for use with the corr_est_cc block as the symbol stream to correlate against.

Any differential encoding or other data coding must be performed on the input vector before this modulation operation.

Be aware that the format of the incoming data must match the format the modulator block is expecting. GNURadio modulator blocks are inconsistent in their data type expectations. For instance, cpmmod_bc expects unpacked,signed bytes in (-1, 1), while gmsk_mod expects packed,unsigned bytes in (0, 1). In other words, the output ofgmsk_mod given the input vector [0xaa, 0x00] is equivalent to the output of cpmmod_bc given the input vector [1,255,1,255,1,255,1,255,255,255,255,255,255,255,255,255]

Please check the documentation or source of the modulator before using this function.


Pointer to a byte-to-complex modulator block
Data vector
Vector of bytes to modulate into symbols.
Filter taps
Post-modulation symbol shaping filter taps.

Example Flowgraph

This flowgraph can be found at [1].

Test corr est fg.png

Source Files

C++ files
Public header files
Block definition