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Design Notes


This project illustrates two methods of constructing a Continuous Phase Binary Frequency Shift Keying (CP_BFSK) system.

The first method uses high-level VSS blocks. The second method uses primitive blocks to construct a BFSK system.

The output spectrums generated from the two systems are shown in the "Spectrum" graph.

BER results are shown in the "BER" graph.

In the BER graph three reference curves are shown:

• Noncoherent BFSK (gray)

• Discriminator BFSK (red)

• Coherent BFSK (black)

The simulation results are shown in green and blue.

The discriminator BER curve assumes ideal wideband with pre-detection filter and is 3dB better than non-coherent (red).

This type of performance may not be attainable when using realistic pre-detection.

Note that the results of the simulation follow closely with that of coherent detection. 

For further information on this example please see the corresponding application note.

System Diagram - CP_BFSK

System Diagram - BFSK

Graph - BER

Graph - RX Waveforms