Ofdm frequency offset

GNU Radio
1

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 have other good frequency offset correction
algorithm which have been implemented.
2.What is the algorithm used by the old version of the
ofdm example?Thanks.

Best regards,
zs

2

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 probably not much
that’s better than S&C in a real world OFDM receiver, but I must admit
that I haven’t implemented many OFDM synchronizers myself.

However, you say

Now in my application,maybe this algorithm isn’t enough.

which means that you have a mathematical measure that’s not OK for S&C,
I guess. So in what way doesn’t S&C suffice? What is it about your
application that makes S&C insufficient or impossible to use?

Best regards,
Marcus

3

Dear Marcus M.:

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 M.” [email protected] wrote:
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 probably not much
that’s better than S&C in a real world OFDM receiver, but I must admit
that I haven’t implemented many OFDM synchronizers myself.

However, you say

Now in my application,maybe this algorithm isn’t enough.

which means that you have a mathematical measure that’s not OK for S&C,
I guess. So in what way doesn’t S&C suffice? What is it about your
application that makes S&C insufficient or impossible to use?

Best regards,
Marcus

On 06/24/2015 09:00 AM, zs wrote:

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 have other good frequency offset correction
algorithm which have been implemented.
2.What is the algorithm used by the old version of the
ofdm example?Thanks.

Best regards,
zs

4

On 24.06.2015 01:48, zs wrote:

Dear Marcus M.:

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, we currently don’t have other algorithms implemented, but of
course, there are many available in literature that will work.

Cheers,
Martin