The simplest BPSK DSSS Radio Beacon with SDR demodulation

In this video, Gregory explains and demonstrate a simple Radio Beacon designed from scratch, using an AVR microcontroller and a logic gate to transmit information using Spread Spectrum BPSK modulation.

Demodulation of the data is accomplished using a custom SDR - Software Defined Radio - written in Javascript. A Tektronix RSA306 Real Time Spectrum Analyzer is used as the RF analog frontend, and the downcoverted IQ data is streamed to a NodeJS instance running the DSSS demodulator.

The Tektronix RSA306 API was binded to NodeJS, loading the DLL using ffi-napi.

Learn how the Spread Spectrum topology works:
   • Spread Spectrum Modulation and Demodu...  

Learn how clock-recovery works using a PLL:
   • Clock Recovery and Synchronization  

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00:34 - Demonstration
02:12 - Block diagram
04:06 - Circuit description and operation
07:34 - Prototype overview
09:16 - Software Defined Radio overview

References:
https://en.wikipedia.org/wiki/Spread_...
https://www.maximintegrated.com/en/de...
https://s53mv.s56g.net/navsats/theory...
https://www.tandfonline.com/doi/abs/1...