This book will provide the reader with a concise introduction to the use of spread spectrum waveforms in multiple user systems, often termed code division multiple access or CDMA. Code Division Multiple Access (CDMA) is appropriate for courses on spread spectrum, advanced digital communication or multiple access, and also for professional engineers in need of a basic understanding of CDMA. Readers are expected to have a fundamental understanding of digital communications, wireless systems, stochastic processes, detection theory, and communication theory. The book builds on these fundamentals by explaining how spread spectrum systems differ from standard digital communication systems, and more importantly, how spread spectrum waveforms are used as a means of channelization in a multiple user scenario. Key Features: * Demonstrates the difference between CDMA and the more widely understood techniques as time division multiple access (TDMA), frequency division multiple access (FDMA), and carrier sense multiple access (CSMA) * Reviews basic spread spectrum techniques such as direct sequence spread spectrum, frequency-hopped spread spectrum and time hopping approaches * Presents four basic principles of cellular CDMA systems: interference averaging, universal frequency reuse, soft handoff, and statistical multiplexing * Examines CDMA system functions such as power control, mobile-assisted hand-off, load control and admission control * Discusses spread spectrum based packet radio networks (PRNs), emphasizing spreading code assignment techniques * Covers multi-user detection algorithms, including both linear and non-linear techniquesAs a result, capacities for single-cell CDMA systems can be substantially lower than those for orthogonal multiple access techniques such as TDMA or FDMA. ... the others, the stronger signal will substantially degrade the performance of the weaker signal in a conventional receiver due to the near- far problem. ... The received signal on the uplink can be represented as r(t) = Ka sk(taIk) + n(t) (5.1) k=1.
|Title||:||Code Division Multiple Access (CDMA)|
|Author||:||R. Michael Buehrer|
|Publisher||:||Morgan & Claypool Publishers - 2006|