KASAMI SEQUENCE PDF

Documentation Help Center. The Kasami Sequence Generator block generates a sequence from the set of Kasami sequences. The Kasami sequences are a set of sequences that have good cross-correlation properties. This block can output sequences that vary in length during simulation. There are two sets of Kasami sequences: the small set and the large set. The large set contains all the sequences in the small set.

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By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Signal Processing Stack Exchange is a question and answer site for practitioners of the art and science of signal, image and video processing. It only takes a minute to sign up. I'm trying to understand why Gold codes and Kasami codes are used instead of pure m-sequences, in direct-sequence spread-spectrum DSSS communication systems, to prevent interference between multiple transmitters.

If I understand correctly, Gold codes are defined as the XOR between two m-sequences with different polynomials of the same degree e. Kasami is also an XOR so I guess it's similar. How is this better than, say, having a system where all transmitters use m-sequences but each of them uses a different polynomial? In both cases, the autocorrelation values are higher than the cross-correlation values.

There are very few m -sequences of any given length with good cross-correlation properties. Their autocorrelation properties are excellent, but the cross-correlation properties are variable. As a consequence, when several sequences with good cross-correlation properties are needed, one needs to use Gold sequence sets or Kasami sequence sets which have good cross-correlation properties and good though not excellent autocorrelation properties.

For more than you probably want to know, I refer you to the paper D. Sarwate and M. Pursley, "Cross-correlation properties of pseudorandom and related sequences," Proc. IEEE, vol. It includes a detailed discussion of the Gold sequences as well as the small sets and large sets of Kasami sequences. Sign up to join this community.

The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Why are Gold codes and Kasami codes used instead of pure m-sequences? Ask Question. Asked 2 years, 9 months ago. Active 2 years, 6 months ago. Viewed 2k times. Jason S. Jason S Jason S 7 7 silver badges 14 14 bronze badges. Thank You!

Active Oldest Votes. Dilip Sarwate Dilip Sarwate At length , the cross-correlation between two m -sequences must have value at least If you choose 6 m -sequences carefully i.

If you add a 7th m -sequence into the set and it doesn't matter which the seventh one is , the new sequence will have cross-correlation at least 41 with one of the original 6 sequences. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast JavaScript is ready to get its own place.

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Documentation Help Center. The KasamiSequence object generates a sequence from the set of Kasami sequences. The Kasami sequences are a set of sequences that have good cross-correlation properties. Define and set up your Kasami sequence object. See Construction.

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On the generalized large set of Kasami sequences

By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Signal Processing Stack Exchange is a question and answer site for practitioners of the art and science of signal, image and video processing. It only takes a minute to sign up. I'm trying to understand why Gold codes and Kasami codes are used instead of pure m-sequences, in direct-sequence spread-spectrum DSSS communication systems, to prevent interference between multiple transmitters.

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Kasami code

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