Table Of Contents

MT Generate MSK System Parameters (G Dataflow)

Last Modified: January 9, 2017

Calculates parameters for use with either MT Modulate MSK or MT Demodulate MSK.

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samples per symbol

An even number of samples dedicated to each symbol. Multiply this value by the symbol rate to determine the sample rate.

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Note  

The demodulation and detector nodes use timing recovery, which is optimized for four or more samples per symbol.

Default: 16

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differential encoding enable

A value that indicates whether to enable differential encoding of the bit stream.

Name Description
disable

Disables bit stream encoding.

enable

Enables bit stream encoding.

Default: enable

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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.

Default: no error

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MSK system parameters

Parameter values defining the MSK system. Wire this parameter to the corresponding system parameters cluster of MT Modulate MSK or MT Demodulate MSK.

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differential encoding enable

A value that indicates whether to enable differential encoding of the bit stream.

Name Description
disable

Disables bit stream encoding.

enable

Enables bit stream encoding.

Default: enable

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samples per symbol

Number of samples per symbol in the modulated output complex waveform.

For error-free operation, the samples per symbol must be an even number. Applying Carson's rule for MSK modulation [peak frequency deviation = 0.25 × symbol rate (Hz)], the 98% MSK bandwidth is given by 0.5 × (1 + r) × symbol rate + peak frequency deviation, where 0 < r ≤ 1 is the filter parameter. To satisfy Nyquist criterion, a good guideline is given by samples per symbol = 2 × ceil(1.5 × bandwidth/symbol rate) to obtain 3× oversampling.

Default: 16

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bits per symbol

Number of bits represented by each symbol. This value is equal to Log 2 (M), where M is the order of the modulation (for example, for 16-MSK, M = 16).

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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


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