1.1 Introduction
Code division multiple access is a spread-spectrum multiple-access technique. A spread-spectrum technique spreads the bandwidth of the data uniformly for the same transmitted power. In CDMA, for secure communication spread spectrum techniques are used which is the method by which a particular bandwidth is spread in the frequency domain resulting in a signal with a wider bandwidth. So, spreading codes are combined in such a way that the bandwidth required is increased so that its gain can be reduced and the signal behaves like noise so that no other receives the signal. At the receiver side, same spreading codes are used to get back the message bits. These codes are specific to each channel/user so that different users can gain access to the system and communicate as required (Lee, 1991; Hara et al., 1997; Dixit et al., 2014).
As a prelude to other parts of this study, this chapter will discuss the background upon which this study was initiated, the statement of problems that led to this study, the Aim and Objectives of the study. Others are Significance of the study, Scope of work, Limitations of the Study and Definition of technical terms.
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