Equalization using channel estimates

Dear All,

I’m trying to perform a simple way of equalization in OFDM transmission.
I
extracted the coefficients provided by the OFDM channel estimation
block,
and sent them back to the transmitter using a TCP socket.

Are these coefficients valid to use in equalization, i.e., can I divide
the
transmitted symbols by the corresponding channel coefficients, and
therefore achieve an almost unity channel taps?

Thank you


---------------------------------------------------
Mohammed Hassan Karmoose
Teaching Assistant, Electrical Engineering Dept.
Faculty of Engineering, Alexandria University
Al-Horeya Rd, El-Hadara, Alexandria, Egypt - 21544
*Tel: *++203-592-1852 | *Fax: *++203-592-1853
Email: m [email protected][email protected]
[email protected]ieee.org http://ieee.org

Website: www.mkarmoose.com http://www.mkarmoose.com/

On 05.02.2014 06:51, Mohammed Karmoose wrote:

Dear All,

I’m trying to perform a simple way of equalization in OFDM transmission.
I extracted the coefficients provided by the OFDM channel estimation
block, and sent them back to the transmitter using a TCP socket.

Are these coefficients valid to use in equalization, i.e., can I divide
the transmitted symbols by the corresponding channel coefficients, and
therefore achieve an almost unity channel taps?

This is impossible to answer. It depends on so many things. When done
right, you can use channel coefficients to equalize, that’s the whole
point of channel estimation and equalization.

You might find the examples in gr-digital/examples/ofdm/*x_ofdm.grc
helpful.

MB

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Hi Mohammed,

I forgot to reply to the list in my previous mail, so I do this now.

On 05.02.2014 16:14, Mohammed Karmoose wrote:

across a relatively long period of time, so it might seem that this
case should be magnified), the effective channel response somehow
is transformed back to the original (unaltered case) channel
response.
An example flowgraph would be very helpful in this case. Where exactly
do your samples get “transformed back”?

what exactly do you want to achieve? Those channel estimates are

Hassan Karmoose* */Teaching Assistant, Electrical Engineering
theft, I would have //executed the legal punishment on her//.’’ -
Prophet Muhammad (PBUH)/
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