Re: [Discuss-gnuradio] Fsk demodulation and sync trouble

I'd suggest using the quadrature modulator block to build a better TX side. Iterate on that until your signal looks correct. Then you can focus on the RX. On Wed, Feb 14, 2018 at 3:14 AM samuel verdon wrote: > Hello everybody, > > I am building a FSK receiver to recover

[Discuss-gnuradio] Fsk demodulation and sync trouble

Hello everybody, I am building a FSK receiver to recover data on UHF. The bit rate of the data is 9,6kbps sent at 437MHz. I put all the information of the flowgraph. The data sent are a Stream of 0x55 or in binar « 1010 ». the medium between the emitter and the receiver is coax cable. Here is my

Re: [Discuss-gnuradio] FSK demodulation questions

On October 18, 2016 3:39:28 PM EDT, Andy Walls wrote: > >It works because the spectrum of a GMSK signal has two spectral peaks >spaced equidistant from the center frequency. Oops. "... spectrum of a *squared* GMSK signal has two spectral peaks ..."

Re: [Discuss-gnuradio] FSK demodulation questions

> From: > Ellis, Duane > > > Date: > Tue, 18 Oct 2016 18:57:33 + > > __ > Hi, > > I've been working towards an FSK demodulator scheme using GNU radio (more >

[Discuss-gnuradio] FSK demodulation questions

Hi, I've been working towards an FSK demodulator scheme using GNU radio (more specifically, the signals are GFSK) I've read through this example: https://nccgroup.github.io/RFTM/fsk_receiver.html Specifically it talks about the "add_const" block, the value of which was determined by trial and

Re: [Discuss-gnuradio] FSK demodulation

On Thu, Jun 19, 2014 at 12:35 PM, Marcus Müller marcus.muel...@ettus.com wrote: Hi Marc, Currently, I am trying to implement correlation receiver using FIR filters. I am looking into polyphase filterbank channelizer to implement correlation, but currently unable to do so because I currently

Re: [Discuss-gnuradio] FSK demodulation

Hi Marc, On 20.06.2014 09:38, Marc Miller wrote: ADC in N210 is sampling at 100Msps, so you are saying that I can get processing gain (better SNR) if I set the USRP sink sample rate higher than IMsps i.e usrp_sink.sample_rate(3.125e6) instead of usrp_sink.sample_rate(1e6) . Right ? Also I read

Re: [Discuss-gnuradio] FSK demodulation

Hi Marc, Currently, I am trying to implement correlation receiver using FIR filters. I am looking into polyphase filterbank channelizer to implement correlation, but currently unable to do so because I currently do not know how to assign taps for channelizer. I should have pointed you at Tom's

[Discuss-gnuradio] FSK demodulation

Hi, I am new to gnuradio, I want to develop 4FSK system. transmitter and receiver. Is there any existing 4FSK transceiver system in gnuradio ? Also, which one of the following two is the best/optimum 4FSK demodulator for low SNR? a. Quadrature demodulation b. Correlator demdulation (autocorrelate

Re: [Discuss-gnuradio] FSK demodulation

Hi Marc, demod: both can be implemented in GNU Radio. Correlation of course is more computationally intensive; I haven't thought about 4-FSK so far, but I guess for quadrature demodulation, you'd need multiple branches to distinguish the possible symbols. There are other approaches (e.g. polar

[Discuss-gnuradio] FSK demodulation

Is there any existing 4FSK transceiver system in gnuradio ? Yes.  The OP25 project has an implementation of FSK4 for use in P25, where FSK4 is sometimes known as C4FM. Both modulation and demodulation is supported.  Here are links to the actual code (see below)  Note that the demod block

Re: [Discuss-gnuradio] FSK demodulation

Hi Marc, demod: both can be implemented in GNU Radio. Correlation of course is more computationally intensive; I haven't thought about 4-FSK so far, but I guess for quadrature demodulation, you'd need multiple branches to distinguish the possible symbols. There are other approaches (e.g.

[Discuss-gnuradio] FSK Demodulation trouble

Hello All, I am working on learning gnuradio and getting a grip on demodulating digital communications. I've been a ham for a long time, and this seems far from my days as a kid running 1200 baud half duplex AFSK. ;) What I have is a toy with a cc1101 chip in it that transmits @ 19.2 k baud,