Digital Communications 1: Fundamentals And Techniques

Mastering PKI, Encryption, and Security Protocols

This book covers the recent progress in fiber-optic communication systems with a main focus on the impact of fiber nonlinearities on the system performance. Over the past few years, there has been significant progress in coherent communication systems mainly because of the advances in digital signal processing techniques.

This lecture covers the fundamentals of spread spectrum modulation, which can be defined as any modulation technique that requires a transmission bandwidth much greater than the modulating signal bandwidth, independently of the bandwidth of the modulating signal. After reviewing basic digital modulation techniques, the principal forms of spread spectrum modulation are described. One of the most important components of a spread spectrum system is the spreading code, and several types and their characteristics are described. The most essential operation required at the receiver in a spread spectrum system is the code synchronization, which is usually broken down into the operations of acquisition and tracking. Means for performing these operations are discussed next. Finally, the performance of spread spectrum systems is of fundamental interest and the effect of jamming is considered, both without and with the use of forward error correction coding. The presentation ends with consideration of spread spectrum systems in the presence of other users. For more complete treatments of spread spectrum, the reader is referred to [1, 2, 3].

Learn SSL/TLS in a Professional Way from Scratch. Become an Expert in Securing Data Transmission, from ZERO to HERO!

Learn SSL/TLS in a Professional Way from Scratch. Become an Expert in Securing Data Transmission, from ZERO to HERO!

Mobile Messaging Technologies and Services: SMS, EMS and MMS, 2nd Edition
Gwenaël Le Bodic
452 pages
February 2005