How the files are generated are briefly discussed here (http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:DocumentViewer;src=pubs;q=/spectreRFTheory/spectreRFTheory13.1/chap2.html )
The files are listed as cdma_2ms_idata and cdma_2ms_qdata . The stored signals
were created with the CDMA signal generator, which is also in the rfLib library located in the Cadence IC 6.1.5 and 6.1.6 hierarchies. Note that these are sample files and they were created a number of years ago.
For actual CDMA specs, I recommend searching the web. There is are multiple CDMA "standards" for lack of a better term.
Here is some basic info from a postgrad course in communications: http://www.comlab.hut.fi/opetus/333/2004_2005_slides/CDMA.pdf
Staff Support AE, Global Customer Support
Cadence Design Systems, Inc.