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Details about CDMA code please

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dudleyzty

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Detail about CDMA code

I want to know the some detail about CDMAone,just as the structure of it's code stream,the meaning of each code segment.
Where can I find something helpful?
 

dudleyzty

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Thanks

:p Thanks for your reply!
I also need to know the program of the CDMA phoneset, so as to know
the difference between the phone with SIM card and the phone without
SIM card.
 

dspusr

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sim card?
Which are you interested in FH or DS CDMA ?
 

toonafishy

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SIM cards have been used for GSM phones for a long time. They have never been used for CDMA phones in the past but the software is now coming on line to support them. I think the push is to protect CDMA phones, especially in the China market, from fradulent cloning. It seems all the China Service Providers are insisting on SIM card capabilities in any rollout of CDMA in that country.
 

dspusr

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Sorry
I've missed your comment "CDMAOne"

Each link(forward, reverse) of IS-95 has different codes structure.
in forward link, Walsh codes x long PN are used as spreading codes.
Walsh codes are used for discrimination channel.
long pn-codes are used for randomization and discrimination base station.
channel interference in same cell(except overreach) is vanished completely.

in reverse link, M-array x short PN are used as spreading codes.
but
channel interference remains in this channel.
 

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