CHAPTER 11 Spread Spectrum (SS) and CDMA Systems
11.1 Introduction
We introduced spread spectrum techniques in Chapter 6. In this chapter, we present details of direct-sequence spread spectrum (DSSS) and frequency-hop spread spectrum (FHSS) systems [1, 2, 4]. We show how signal spreading and despreading is achieved with binary phase shift keying (BPSK) and quadrature phase shift keying (QPSK) modulation in the DSSS [11, 12]. We then address multipath issues in wireless communications and show how code division multiple access (CDMA) takes advantage of multipath in improving system performance with a Rake receiver [6, 13]. We conclude the chapter by presenting a summary of the challenges in implementing a CDMA system and providing some highlights ...
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