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Walsh code

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Walsh code
Also known as "Walsh-Hadamard code," it is an algorithm that generates statistically unique sets of numbers for use in encryption and cellular communications. Known as "pseudo-random noise codes," Walsh codes are used in direct sequence spread spectrum (DSSS) systems such as QUALCOMM's CDMA. They are also used in frequency hopping spread spectrum (FHSS) systems to select the target frequency for the next hop. See CDMA.

          Walsh Code Algorithm

          (a', b') = (a+b, a-b)


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Further details of Walsh code assignments for traffic channels along with allowable data rates and corresponding post-interleaver repetition rates can be found in [1].
A link-level simulator of the cdma2000 reverse-link physical layer by Wyatt-Millington R. / Journal of Research of the National Institute of Standards and Technology
A Walsh code is 64 chips long and lasts 1/19200 seconds.
From Watson to W-CDMA by Peichel, Cory / Communications News
It is capable of lightning-fast scans in multiple frequency bands, with multiple technologies, doing PN and Walsh Code, CPICH, DVCC, and BSIC decoding simultaneously.
Comarco Wireless Test Solutions Supplies ZK Celltest with Latest OEM ... by Business Wire
 
 
 
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