ODR-DabMod
Revision as of 16:44, 13 October 2010
CRC-DabMod is the DAB OFDM modulator command developed by Communication Research Center (CRC) from Canada. It is now published in open source with a gnu GPLv3 license.
- CRC-DabMod description and source code on MMBTools website
CRC-DabMod take an ETI (Ensemble Transport Interface) stream as input and output a complex baseband stream of interlaced 16 bits I/Q samples with a default sampling frequency of 2.048MHz.
Resampling is the cause of high CPU usage but cannot be avoided to match with USRP sampling limitation. One possiblity could be to change the clock of the USRP1.
Example:
CRC-DabMod ./racor.eti -l -g1 -r3200000
get racor.eti file, perform OFDM modulation on baseband at a sampling frequency of 3.2MHz. Output is sent to the standard output if not redirected or piped to another command (CRC-Dwap.py in general)
Build information
When building from the source code, be careful to disable debugging, otherwise there will be lot of wasted CPU usage:
./configure --with-debug-malloc=no --disable-debug
Usage
Usage:
CRC-DabMod [input [output]] [-c clockrate] [-f] [-g gainMode] [-h] [-r samplingRate]
Where:
input: ETI input filename (default: stdin). output: COFDM output filename (default: stdout). -c: Set the DAC clock rate. -f: (deprecated) Set fifo input. -g: Set computation gain mode: 0 FIX, 1 MAX, 2 VAR -h: Print this help. -l: Loop file when reach end of file. -r: Set output sampling rate (default: 2048000).
