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Vladimir Fadeev edited this page Aug 12, 2019 · 14 revisions

How the Hard decision demodulation is implemented?

The MathWorks company provides several algorithms to demodulate BPSK, QPSK, 8-PSK and other M-PSK modulation schemes.

To reduce the number of implemented schemes the following way is used in our project:

calculate LLRs (soft decision)
map LLR to bits according to the sign of LLR (inverse of NRZ)

Why for the soft outputs only Approximate LLR calculation algorithm is selected

Why Gray mapping is the default option?