Search Results for: BBFM

Machine Learning Equalisation (ML EQ) Continuing from last month I’ve had some success at using Machine Learning for equalisation (ML EQ), and have some simulation results that show improved performance at low SNRs with a narrow band (600 Hz RF bandwidth) waveform and no pilot symbols. The narrow bandwidth was suggested from experiments around training …

Continue reading “David Mar 2025 – ML EQ, 700D ASR, RADE Presentation, BBFM fading”

This month I conducted a successful test of the Baseband FM (BBFM) waveform, over a short UHF radio link on my bench. This demonstrates high quality, 8000 Hz audio bandwidth speech being transmitted over the air (OTA) using commodity FM UHF radios and machine learning. It’s early days, but the speech quality already appears competitive …

Continue reading “David Nov 2024 – BBFM OTA tests & C Port & EOO Text”

The working acronym for the Radio Autoencoder has been changed from RADAE to the more use-friendly RADE (pronounced”raid”). This month I continued working on getting RADE V1 into a form where it can be used in real time. The hybrid Python/C model seems to be working out quite well, meeting our goal of enabling hams …

Continue reading “David’s Oct 2024 Update – Real Time RADE & BBFM”

RADE Documentation One of the aims of this project is to document our work to a professional standard. This month I spent some time working on two research papers, one on the HF RADE work, and one on the baseband FM (BBFM) work. I’m also working on a presentation of RADE technology aimed at Hams, …

Continue reading “David Feb 2025, Papers, ML EQ prototyping”

At the start of this month I did battle with the problem of SNR estimation on the RADE V1 signal. As I have mentioned previously, this had some challenges due to the lack of structure in the RADE constellation. After a few false starts I managed to get something viable running using the properties of …

Continue reading “David Jan 2025 – SNR estimation, Bandwidth, EQ, 2024 in review”

Tibor Bece and George Karan are collaborating with me on the baseband FM (BBFM) project. Tibor and George are veterans of the land mobile radio (LMR) industry, having worked together for many years and helped develop commercial VHF and UHF radio hardware with over 2 million units manufactured. They are pretty excited about the Radio …

Continue reading “DC Coupled Baseband FM Testing”

From mid-August to mid-September, we conducted a Radio Autoencoder (RADAE) test campaign in two phases (a) stored files and (b) a prototype real time system. Ten people joined our test group, with many submitting stored file and real time test results. In particular I would like to thank Mooneer K6AQ, Walter K5WH, Rick W7YC, Yuichi …

Continue reading “David’s FreeDV update – September 2024”