O'Reilly logo

IS-95 CDMA and cdma2000: Cellular/PCS Systems Implementation by PhD, PE - Department of Electrical Engineering and Computer Science, University of Illinois at Chicago, Chicago, Illinois U.S.A. Vijay K. Garg

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Chapter 4 Diversity, Combining, and Antennas

4.1 Introduction

In this chapter, we discuss the concepts of diversity reception where multiple signals are combined to improve the SNR of the system. Time diversity is used to improve system performance for IS-95 CDMA systems; therefore we explore that system in more detail. We then describe various combining schemes that are used to combine the signals. Finally, we consider some practical antennas used in the cellular telephone industry today.

4.2 Diversity Reception

Buildings and other obstacles in built-up areas scatter the signal. Furthermore, because of the interaction between the several incoming waves, the resultant signal at the antenna is subject to rapid and deep fading. Average signal ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required