WP4000 C Port of Modem

[drowe67]

When the Octave simulations and OTA testing have shown the new modem waveform is useful, port the modem to C. Note that for a complete Low SNR FReeDV mode we also need a candidate speech codec (WP2000). This WP deals only with the C port of the modem code alone

• [ ] Shall we still use the Octave->ofdm_xxx->freedv_xx workflow?
• [ ] define ctests we need to pass
• [ ] obtain/develop a new LPDC code that includes payload and txt bits, so that txt bits are now protected (alternative to reliable text system).
• [ ] perform port
• [ ] review code
• [ ] review corrections
• [ ] PR is merged

Reviewers: David and Mooneer

Deliverables:

• [ ] list of ctests and pass criteria
• [ ] ofdm_xx.[ch], ofdm_xxx.c ported and passing ctests
• [ ] merged PR