About the example_timing.py in the example

GNU Radio
1

Hi, all,

I am not sure if the timing example in

gr-digital/examples/example_timing.py

has some issues when using M&M timing recovery. In this example, if
setting --mode=1
we will run into

    self.connect(self.src, self.rrc, self.chn, self.off, self.clk,

self.vsnk_clk)

where the channel output directly going into the M&M timing block, but I
believe there must another ‘Root Raised Cosin’ filter between them to
remove ISI?

Regards

Wang N.

2

On Thu, Nov 10, 2011 at 1:34 AM, Wang N. [email protected] wrote:

   self.connect(self.src, self.rrc, self.chn, self.off, self.clk,

self.vsnk_clk)

where the channel output directly going into the M&M timing block, but I
believe there must another ‘Root Raised Cosin’ filter between them to
remove ISI?

Regards

Wang N.

Yes, you’re probably right. This code was originally meant just to
exercise
the PFB timing recovery block, which does the RRC filtering itself. I
just
added the M&M way later.

Thanks,
Tom