The pseudo noise is generated using an algorithm based on inputted numbers and this 'noise' is multiplied with the data that needs to be transmitted to produce a 'spreaded' version of the signal. The spreading of the signal usually transforms the signal into one that is below the natural noise level. This makes the signal hard to trace and intercept or scramble.
Spread Signal below noise level |
There are a few pseudo noise techniques that are used for CDMA, such as; Gold Codes, Walsh- Hadamard Code, M-Sequence Code, Barker Code and Kasami Code.
We will be focussing mainly on Walsh- Hadamard Code and M-Sequence Code.
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