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abdulmajidshah420

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04-23-2010 09:57 AM

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Registered:
04-07-2010

can anyone help me in implementing cross correlation in verilog or vhdl or give some code

hi,

can anyone help me in implementing cross correlation in verilog or vhdl or give some code.i cn't find any woring on it

7 Replies

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drjohnsmith

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04-24-2010 09:39 AM

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Registered:
07-09-2009

HI

have a look on wikipedia,

cross corelatino is easy,

You have two vectors of numbers, one the input, one the correlation.

Now this is from old memory so plkease check,

You reverse the input vector

then multiple all the corelatino against the first lot of the input, and add together.

the answer goes in bin 0,

you then slide the corelatoin one down the input, and reeate, but the addition goes into bin 1,

contiunue,

<== If this was helpful, please feel free to give Kudos, and close if it answers your question ==>

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adonisdl

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05-10-2010 11:18 PM

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Registered:
05-10-2010

how about the auto correlation? did i need to use the cordic ip core to help me doing that?

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No you do not need CORDIC for either cross-correlation or auto-correlation. The correlation is very similar to FIR filtering, the difference is the reference waveform (the coefficients) are reversed for correlation relative to the order they are presented for FIR filtering. For auto-correlation, the signal is also the reference so you need to cycle the reference coefficients to make it work, but the structure is still basically an FIR filter.

randraka

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05-11-2010 05:44 AM

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05-11-2010

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I saw the data sheet of the fir filter IP core the formula of the single rate FIR is similar to the cross correlation but not the same...

adonisdl

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05-11-2010 07:54 PM

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randraka

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05-12-2010 05:55 AM

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Registered:
05-11-2010

It is the same except the order is reversed.

FIR filter is Y(k) = X(k)C0 + X(k-1)C1 + X(k-2)C2 + ... + X(1)C(k-1)

Correlation is

Y(k)=X(0)C(0) + X(1)C(1) + ....+ x(k)C(k)

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mahadevanna

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01-19-2011 01:23 AM

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Registered:
12-28-2010

I took a sin wave block and took the coefficients of them and made and reversal of those coefficients and used them in fir complier as coefficients and then connected the same sine wave block to fir complier and was not getting the output . it is always showing zero.

please help me

waiting for your reply

mahadev

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eteam00

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01-20-2011 02:41 AM

9,284 Views

Registered:
07-21-2009

I took a sin wave block and took the coefficients of them and made and reversal of those coefficients and used them in fir complier as coefficients and then connected the same sine wave block to fir complier and was not getting the output . it is always showing zero.

please help me

waiting for your reply

mahadev

Please stick to one thread for a single topic. This is the 3rd thread to which you've posted the same problem, making it difficult for others to read and respond.

- Bob Elkind

SIGNATURE:

README for newbies is here: http://forums.xilinx.com/t5/New-Users-Forum/README-first-Help-for-new-users/td-p/219369

Summary:

1. Read the manual or user guide. Have you read the manual? Can you find the manual?

2. Search the forums (and search the web) for similar topics.

3. Do not post the same question on multiple forums.

4. Do not post a new topic or question on someone else's thread, start a new thread!

5. Students: Copying code is not the same as learning to design.

6 "It does not work" is not a question which can be answered. Provide useful details (with webpage, datasheet links, please).

7. You are not charged extra fees for comments in your code.

8. I am not paid for forum posts. If I write a good post, then I have been good for nothing.

README for newbies is here: http://forums.xilinx.com/t5/New-Users-Forum/README-first-Help-for-new-users/td-p/219369

Summary:

1. Read the manual or user guide. Have you read the manual? Can you find the manual?

2. Search the forums (and search the web) for similar topics.

3. Do not post the same question on multiple forums.

4. Do not post a new topic or question on someone else's thread, start a new thread!

5. Students: Copying code is not the same as learning to design.

6 "It does not work" is not a question which can be answered. Provide useful details (with webpage, datasheet links, please).

7. You are not charged extra fees for comments in your code.

8. I am not paid for forum posts. If I write a good post, then I have been good for nothing.