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Re: [Discuss-gnuradio] CMA Equalizer

From: Tom Rondeau
Subject: Re: [Discuss-gnuradio] CMA Equalizer
Date: Mon, 23 Mar 2015 07:25:11 -0700

On Mon, Mar 23, 2015 at 3:51 AM, Merry Dominic <address@hidden> wrote:

What do the number of taps in the CMA equalizer block represent, I hope it is the channel size. Should it be the number of tap coefficients given for the variable 'taps' in the channel model block. If I give 'taps' in the channel model block (I am considering the basic awgn channel model block) as taps =[a1+jb1,a2+jb2,a3+jb3,a4+jb4], what should be the Num. Taps in the CMA equalizer block.I am using the polyphase clock synchronizer between the channel model block and the equalizer.

Please help.Looking forward for your reply.


Yes and no. The number of taps is to shape the equalizer's response appropriately for the channel. Generally, we don't know anymore more than some statistics about the channel and so we try to select the number of taps in the filter according to that. It won't be perfect since channels are always changing, so we try and balance the complexity of the algorithm with the response to the channel. The more taps, the more accurate you get, but at greater computational cost.

So no one can really answer this question for you.


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