[Discuss-gnuradio] ofdm - adjust subcarriers

2009-11-23 Thread Hanno Jung
Hi out there, I'm trying to send an ofdm signal. I don't want to tramsit any data, I only want to see the reslting spectrum. Now I'm wondering how to turn off certain carriers. I know this is possible by adjusting the transmitted data but is there a better way to do this? For example by

[Discuss-gnuradio] switching filter taps in rational resampler

2009-11-23 Thread dave
Dear All, I'm trying to correct for clock drift, and implement clock recovery, reading data from a USRP1. I can't use MM clock recovery. The signal is DSSS, and I can produce accurate estimates of the phase / timing error, but not on a continuous stream in real time. I hope therefore to make

Re: [Discuss-gnuradio] USRP2 802.11 BBN Code TX - filter fix?

2009-11-23 Thread Colby Boyer
If someone writes a Fast Walsh Transform block, then 5.5 and 11 Mbit is possible. Only a few changes need to be made to the MAC block to accommodate this change. Getting G (OFDM) to work seamless with B will be be a bit difficult I think. You are then switching rates, 20 MHz vs 11 MHz if I

[Discuss-gnuradio] Problem converting old GRC flowgraph

2009-11-23 Thread Ed Criscuolo
Josh, Is there some separate program to convert old-style GRC flographs (ie - grc_0.69) to the new-style ones required by the GRC included with GnuRadio 3.2.2? I tried to simply use GRC to open the older flowgraph (which worked fine on grc 0.69 and gnuradio 3.1.3) directly, but got hundreds

Re: [Discuss-gnuradio] Problem converting old GRC flowgraph

2009-11-23 Thread Josh Blum
You missed the window of opportunity. There was such code, it existed for about a year in the svn trunk. You need to checkout the svn trunk from about a year ago, and use that grc/gnuradio to open the files (this will convert them). Now you can use those converted files with the grc in the

Re: [Discuss-gnuradio] CDMA in GNURadio

2009-11-23 Thread Lin HUANG
It is possible I think. The current synchronization method only uses the inserted preambles. If you don't change the preamble, it will not affect the synchronization. You may add a Code block into the transmitter diagram, also you need to change some parameters of other blocks. But for the