Re: [Discuss-gnuradio] ofdm frequency offset

2015-06-24 Thread Marcus Müller
Dear zs, basically, Schmidl and Cox is a very good algorithm, because it can achieve the same quality of synchronization with half of the synchronization overhead compared to other approaches, or a better performance with the same amount. I must admit that from the top of my head, there's

[Discuss-gnuradio] ofdm frequency offset

2015-06-24 Thread zs
Dear all: Thank you in advance. 1. I want to ask a question about the new ofdm example.And I know the receiver have used the SCA(schmidl and cox algorithm) algorithm.Now in my application,maybe this algorithm isn't enough.And I want to ask whether

Re: [Discuss-gnuradio] ofdm frequency offset

2015-06-24 Thread Marcus Müller
Hi zs, this reminds me very much of OFDM radar technologies, as your problem boils down to finding a good estimator for the spectral properties of your OFDM frame as well as the time it reached you. I think you should have a look at chapter 3, OFDM Radar Algorithms of [1]; you might find that

Re: [Discuss-gnuradio] ofdm frequency offset

2015-06-24 Thread zs
Dear Marcus Müller: Thank you so much for your kindly reply. The SCA is adequate for a correct demodulation of the signal while maybe inadequate for estimate the precise frequency shift.I don't have the synchroniztion device.In my application,I need to reconstruct one transmit signal in

[Discuss-gnuradio] ofdm frequency offset

2015-06-24 Thread zs
Dear all: Thank you in advance. 1. I want to ask a question about the new ofdm example.And I know the receiver have used the SCA(schmidl and cox algorithm) algorithm.Now in my application,maybe this algorithm isn't enough.And I want to ask whether

Re: [Discuss-gnuradio] ofdm frequency offset

2015-06-24 Thread zs
Dear Marcus Müller: Do you know which is the synchronization algorithm used in the old version of ofdm example?Where is the source code of the old ofdm version in gnuradio?Thanks. Any other suggestions? Thank you. Best regards, zs At 2015-06-24 15:54:30, Marcus Müller

Re: [Discuss-gnuradio] ofdm frequency offset

2015-06-24 Thread zs
Dear Marcus Müller: Thank you so much.So kindly of you.Thanks.I will read the papers you mentioned. Best regards, zs At 2015-06-24 17:08:16, Marcus Müller marcus.muel...@ettus.com wrote: Hi zs, this reminds me very much of OFDM radar technologies, as your problem boils down to finding a

Re: [Discuss-gnuradio] ofdm frequency offset

2015-06-24 Thread zs
Dear Marcus Müller: Actually my problem is: y=useful information+x*h(channel)*cfo(carrier offset due to the local oscillator between the interference and the radar)+noise. I want to turn y to new_y=useful information+noise. So I need know the channel(h)

Re: [Discuss-gnuradio] ofdm frequency offset

2015-06-24 Thread Martin Braun
On 24.06.2015 01:48, zs wrote: Dear Marcus Müller: Do you know which is the synchronization algorithm used in the old version of ofdm example?Where is the source code of the old ofdm version in gnuradio?Thanks. It's a very similar implementation to the 'new' versions. In stock GNU Radio,