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To be usable for direct sequence spreading, a PN code must meet the following conditions :
1. Sequence must be built from 2 levelled numbers.
2. The codes must have sharp autocorrelation peak to enable code synchronization.
3. Codes must have a low cross-correlation value, the lower it is, more are the number of users which can be allowed in the system.
4. The codes should be ?balanced? i.e. the difference between ones and zeros in code may only be 1.
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