Chapter 3 Speech and Channel Coding
In this chapter, we consider the speech and channel coding applications in the IS-95 CDMA system (the data application is discussed in chapter 14). Since speech encoding is critical to digital transmission and since it is the primary application needed for most wireless phone uses, we will focus on the speech coding algorithms used by CDMA. CDMA uses an 8-kbps (or a 13.3-kbps) data rate for voice transmission.
The wireline network is based on voice transmission using digital Pulse Code Modulation (PCM) at 64 kbps and data transmission at rates of 64 kbps or multiples of 64 kbps. Many older analog facilities still exist, especially in residential areas, and these use voice band modems at rates ...