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Walsh code
(redirected from Walsh codes)

   Also found in: Wikipedia 0.02 sec.

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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Spreading function using Walsh codes and Quasi Orthogonal
 
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