Well, in my case the tx/rx would not be stationary, so the channel is not quite.
-- Bob > If you can tolerate the stream stopping, use Power Squelch. Otherwise, > time to dive in and follow Tom's advice from May - disable the CMA taps > update loop when there's no signal. This whole idea assumes you have a > mostly quiet channel, stationary tx/rx, etc. Interested to hear what you > come up with. > > - Jeff > > On 10/01/2014 11:24 PM, bob wole wrote: > > I applied this and this is useful in condition when you do not want to > > process noise, because it is being multiplied by zero when there is no > > signal. But I want that CMA taps remain unchanged when there is no > > signal or just noise. In the above scenario CMA taps change due to > > presence of noise, because it tries to equalize noise as well. Thanks > > for your comment. > > > > -- > > Bob > > > > On Mon, Sep 29, 2014 at 7:19 PM, Jeff Long <willco...@gmail.com > > <mailto:willco...@gmail.com>> wrote: > > > > Try using a "threshold" off the "mag squared" and feed that into a > > multiplier after block2 (with appropriate type adapters). As long as > > block2 doesn't have a huge delay or do rate changes, this should > work. > > > > - Jeff > > > > On 09/29/2014 10:23 AM, bob wole wrote: > > > Hi thanks for your comment. block2 is the gnuradio "CMA equalizer > > > block". I want the CMA block to remain quiet when there is no > signal of > > > interest. > > > > > > Bob > > > > > > > > > Bob, > > > > > > Saw this the other day, but there isn't a lot to go on here. > If block2 > > > is your own, you can make it do the bypass. You can also use > some of the > > > logic blocks and a multiplier depending on what you're doing. > There > > > isn't really a concept of on-the-fly switching in GNU Radio. > > > > > > - Jeff > > > > > > On 09/26/2014 01:02 PM, bob wole wrote: > > > > > > > > People, any ideas on it? > > > > > > > > -- > > > > Bob > > > > > > > > On Wed, Sep 24, 2014 at 12:04 PM, bob wole < > bnw...@gmail.com <mailto:bnw...@gmail.com> > > > <mailto:bnw...@gmail.com <mailto:bnw...@gmail.com>> > > > > <mailto:bnw...@gmail.com <mailto:bnw...@gmail.com> > > <mailto:bnw...@gmail.com <mailto:bnw...@gmail.com>>>> wrote: > > > > > > > > I have following flowgraph: > > > > > > > > > > > > > > usrp_source--->>probe_mag_squared_block---->block2--->block3 > > > > > > > > What I want to do is that I want to bypass the "work" > > function of > > > > block2 when the threshold level of probe_mag_squared > > reaches. > > > I do > > > > not want to stop(), lock(), disconnect the flow graph. > > Is this > > > > possible using stream tags, or message passing etc ? > > Any example > > > > code would be nice. > > > > > > > > -- > > > > Bob >
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