junaid124 / wcdma_trace_analysis Goto Github PK

Analyze the WCDMA traces collected by USRP.

-------------------------
1. Collect traces:
Becasue the WCDMA uses 3.84Mchips/s rate, we need to set the sampling rate to 7.68M samples per second.

uhd_rx_cfile.py -v --show-async-msg -g 45 --samp-rate=7.68e6 -f 1965M uhd_signal.dat

We can use USRP utility tool to visualize collected trace:

gr_plot_yichao.py -s 20000000 -B 5000 -R 7.68e6 uhd_signal.dat


-------------------------
2. Compile codes:
make


2.1. autocorrelate.cc
the main code to analyze WCDMA traces which includes:
i) find slot and frame boundary
ii) identify secondary synchronization code, first scrambling code, second scrambling code

usage:
autocorr <preamble input file> <start index> <end index> <threshold>

e.g.
./autocorr DL_wdata_768.dat 22206100 22400000 7 
perl autocorrelate.pl


2.2. output_ycc.cc
(codes from Apurv with slitely modification)
Convert USRP binary signal files to readable format:
[index] [magnitude] [phase] [real] [imaginary]

usage: 
output <file name>

e.g.
output uhd_signal.dat


2.3. autocorrelate2.cc

usage: 
autocorr2 <preamble input file> <start index> <end index> <threshold>

e.g.
./autocorr2 DL_wdata_768.dat 21000000 21030000 > coeff2.txt 
gnuplot plot_coeff2.plot

batch:
batch.pl