Re: [Discuss-gnuradio] In ofdm example, is channel estimation work only done in one preamble per frame or each symbol per frame?

[Yingjie Chen]

OK. I have cc it to mailing list.

Here is my response message, looking forward to your reply.

I am doing the experiment over the air. I am not using VERBOSE, but I use the simliar method, just extract hestimate value from the code and print it out (cout<<...)directly. However, as I mentioned before, the terminal shows serverl sets of hestimate value  followed one frame, which make me so confused. It should be one set for one frame.

By the way, can you tell me how to simulate it without any outside effects? And I also want to plot the channel, can you tell me how to save the hestimate data in a file and how to use this data to plot the channel.

Thank you so much again.

2013/4/6 Tom Rondeau <address@hidden>

Please respond to this on the mailing list.

Thanks,
Tom

>> Yes, that's right, the hestimate should only be calculated on the
>> preamble. Are you doing this over the air or under simulation? I would
>> suggest starting in simulation to make sure that there are no outside
>> effects happening that causing the receiver to trigger the
>> re-estimation.
>>
>> Are you using the VERBOSE output of the file? Just set VERBOSE to 1 at
>> the top of the ofdm_frame_acquisition file and it will print out its
>> values for you. I know we debugged using this and the estimations
>> looked fine. We were able to plot the channel this way, and it looked
>> pretty good.
>>
>> Tom
>
>