Quoting Tarun Tiwari <[EMAIL PROTECTED]>: > Hi, > > Can somebody enlighten me about the symbol synchronization in Packet Radio > example? I was wondering if someone can tell me which scheme is being used > for it. > > It will be helpful if one can give me reference to the GNU Radio module > where I can read the codes line by line to understand it. I need that for > our project in MIMO systems. We guys at University of Texas, Dallas are > trying to do some testing on GNU Radio for MIMO fading channels. So, I need > to know how and when I should sample a recieved packet on different > receivers. >
We use a modified Mueller & Muller for I&Q data, which is located in /lib/general/gr_clock_recovery_mm_cc.* There is a reference to a paper that explains its implemention inside the code. > Also it would be great for us if someone can tell me use of Access code in > addition to Preamble in a transmitted packet. The preamble is used for AGC and frequency/phase synchronization (Costas loops in BPSK and QPSK) while the access code allows us to correlate with a packet and understand where the MAC-layer frame begins. The default access code in the current implementation is based on GSM access codes (I think). > Thanks in advance. > > Regards, > Tarun > Tom _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
