Re: [Discuss-gnuradio] Help using simple_framer and simple_correl ator

[Robitaille, Michael]

Use of gmsk2 versus simple_framer & simple_correlator.

 

The project I am working on has the following characteristics:

1.       Remote telemetry using optical link.  For proof of concept need to measure temperature from multiple sensors (5 thermocouples).  The temperature is represented by 8 bit word and sampled every 0.2 seconds per thermocouple (limited by the MAX6675 chip).  This would results in data rate of 200 bits/sec.

2.       Carrier frequency – 1 KHz to 2 KHz due to the modulator we are presently using for the proof of concept.  In phase II we will have the funds to improve the modulator and increase the frequencies.  For proof of concept we will have two transmitters at different carrier frequency, 1Khz and 2 Khz.

3.       ASK modulation. – turning on/off a reflected optical beam that is illuminating the transmitter.

4.       The data is continuously transmitted and the microprocessor controlling the modulation is very limited on what it can implement (cant do CRC32).

 

Please let me know what you suggest.

 

Erric – thanks for the references on the Meuller & Muller synchronizer and Digital Communication Receivers.

 

Mike