How to generate sine or cosine waves in Verilog HDL

[mike83]

hi! i am a student and want to modulate QPSK in verilog HDL. i need
sine and cosine waves for I & Q channels. please help me to provide
simple examples of cosine waves.

 

[Jonathan Bromley]

On 13 Feb 2007 21:47:21 -0800, "mike83" <engr.ikram@gmail.com> wrote:

hi! i am a student and want to modulate QPSK in verilog HDL. i need
sine and cosine waves for I & Q channels. please help me to provide
simple examples of cosine waves.

+1, 0, -1, 0.

Other approximations are available, and may suit your purpose better
depending on the system requirements.

The obvious approach is to use a lookup table (ROM) to store the
cosine waveform, but note also that CORDIC rotators can easily
be used to do modulation.
--
Jonathan Bromley, Consultant

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