Re: [Discuss-gnuradio] Equalization class help

[bob wole]

Thanks for your reply Tom. Could I have some  more explanation on it?  if a training sequence at start of each burst could help in fast convergence for burst modem?

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Bob

On Mon, May 12, 2014 at 6:01 AM, Tom Rondeau <address@hidden> wrote:

On Mon, May 12, 2014 at 5:59 AM, bob wole <address@hidden> wrote:

I want to work on equalization for ISI removal due to multipaths for burst frequency shift keying system. I found equalizer class in gnruadio, I want to know if somebody used cma_equalizer for the task with success or if I can use it for equalization of burst frequency shift keying system before continuing with it?

Thanks

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Bob

It'll conceivably work, but the challenge with the CMA equalizer (and the LMS-DD equalizer as well) is the long convergence time. Between every burst, you're going to lose tracking of the taps, so you might want to think of a way to shut down the tap update loop when you're not receiving a packet (which involves knowing when that's happening in time to send the info to the equalizer). For starters, just use a few taps in the equalizer and a gain higher than you would expect to see if you can get it to converge to "close enough" early in the burst.

Tom