Simulink: How to implement a basic Differential encoder in HDL coder?

Hi,

I Have the following query:

1) How does one implement a differential encoder in HDL coder? The pre-existing blocks cannot be converted to HDL.

Am using Simulink for this. Please help.

Answer 1

[Kiran Kintali]

An additional note not knowing fully your requirements

The definition of a differential encoder is:

The output is the logical difference between the current input element and the previous output element. More specifically, the input and output are related by

 % Initial condition parameter value (ic)
 d(i0) = m(i0) XOR ic 
 d(ik) = d(ik-1) XOR m(ik)

Assuming the input is sample-based, this is just a delay block and XOR.

Answer 2

[Kiran Kintali]

Please check if these shipping examples for differential encoding (QAM and QPSK) help?

HDL Optimized QAM Transmitter and Receiver

HDL Optimized QPSK Transmitter