12
CDMA2000 and Its Evolution
12.1 Development of 3G CDMA2000 Standard
With code division access each user is assigned some code, modulation by which disperses the user’s data over the bandwidth. The data from all users are overlaid with each other, but because of the correlation properties of modulation sequences the receiver may extract the signals of particular users from the overall received signal [5, 6]. The methods of multiple access with code division were considered in Chapter 9.
The CDMA standards exist both for second generation networks (2G) and for third generation networks (3G). CDMA standards of the second generation are called cdmaOne and include IS-95A and IS-95B standards.
CDMA is also the basis for 3G standards: two main standards of third generation networks based on CDMA: these are CDMA2000 and WCDMA standards. In this chapter we consider the standards of the CDMA2000 family. Below is a brief description of IS-95 and IS-2000 standards.
12.1.1 IS-95 Family of Standards (cdmaOne)
This telecommunication standard, which uses CDMA, was developed by Qualcomm and titled IS-95 (Interim Standard 95, also the title cdmaOne is used). This is the second generation standard (2G) for working in frequency bandwidth used in the USA by analog communication systems (AMPS). The CdmaOne standard contains a full description of the wireless system, and includes IS-95A and IS-95B revisions of ...
