Can a CDMA PN sequence be fully random, as in encryption-grade randomness, or must it be deterministic? I have tried the first bytes of SHA-256 hashes as PN sequences, but somehow they don't coexist too well.

I know a deterministic code can be generated on-the-fly so no storage is needed, but let's say I have 500 fully random PN sequences stored on a device. Is that good or do you really need deterministic codes like the Gold codes?


A typical type of "pseudo-random" sequences used in CDMA is the "m-sequences" that also provide good properties in wireless channels with multipath. Have a look to this post for more information about these: http://www.behindthesciences.com/towards-5g/directsequencespreadspectrumandrakereceiver

hope this helps :)

  • $\begingroup$ Thanks, I understand now. It's not so much about being random as it is about using codes that do not interfere with each other. Even a fully random code could have a chance at corrupting another fully random code. $\endgroup$ – H. C. Barton Mar 10 '16 at 14:36
  • $\begingroup$ that's it! happy to help :) $\endgroup$ – Behind The Sciences Mar 11 '16 at 6:01

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