Walsh Codes

In the forward link (the leg from the tower to the handset), CDMA uses Walsh codes which are generated by applying the Haddamard transform on 0 repeatedly.

H1 = [0]

H2n = [Hn Hn ; Hn 1-Hn]

The matrix will grow by powers of 2. The first row is discarded because it will usually be a constant but all the rows below it will be mutually orthogonal. That is why you only get N-1 different codes for N length codes.

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 Matlab Code ©2001 Kyle Bryson, Alison Chen, and Allen Wan