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CDMA sensing with USRP
I decided to start looking at how UMTS works and obviously the first thing to look at is the CDMA. One thing an ME is looking at when powered on is the synchronisation channels. There are two such...
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Running GPS software on USRP
I checked today how the gnss-sdr project (www.gnss-sdr.org) is working. I’m interested in algorithms used for the L1C/A and this project sounds just the right one to start with. This project aims at...
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DVB-T implementation in GNUradio – part 1
Later edit: source code added here: https://github.com/BogdanDIA/gr-dvbt Motivation for implementing DVB-T RX/TX: I thought I should write about my work on implementing the ETSI 300 744 (DVB-T )...
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DVB-T implementation in GNUradio – part 2
Later edit: source code added here: https://github.com/BogdanDIA/gr-dvbt In the previous post I presented the results when using the gnuradio DVB-T transmitter together with the RTL2832U Elonics...
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DVB-T implementation in GNUradio – part 3
Later edit: source code added here: https://github.com/BogdanDIA/gr-dvbt In this article I will describe my DVB-T receiver implementation in GNUradio. The blocks used for receiving are basically the...
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Using WiFi Atheros chips in hamradio bands
Motivation: I was aware for long time that Atheros (bought by Qualcom in May 2011) wifi chips can work in the below 2.4Ghz band and lately I saw an old post from here confirming that but I had never...
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DVB-T implementation in GNUradio – Viterbi decoder implementation
Later edit: source code added here: https://github.com/BogdanDIA/gr-dvbt The picture above is not directly connected to the following discussion but it is showing a 64-QAM signal decoded with the...
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Direction Of Arrival simulation with Nec2
This paper presents the method used for simulation of an Uniform Linear Array in 4Nec2 program and the results that are obtained by using the array output in Matlab with DOA methods rootMusic, Esprit,...
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RTL2832u based coherent multichannel receiver
This paper explains the experiment done with multiple RTL2832u SDR receivers in order to create a multichannel receiver by using an unique HW clock source and signal correlations to obtain correction...
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DMR app for repeaters
I know I haven’t written for quite some time. I decided to write again since I’ve done some work for hamradio community and I want to share it. As it happened lately, more and more hamradio operators...
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