Fall 2015 textbook list
The Fall 2015 ECE textbook list is available online for students.
Current Prerequisites & Course Offering
For current prerequisites for a particular course, and to view course offerings for a particular semester, see the Virginia Tech Course Timetables.
ECE 5660 Spread Spectrum Communications (3C)
Major topics include: direct sequence and frequency hopping methods, synchronization, resistance to jamming to jamming, low probability of detection, spreading codes and their generation, system performance, Rake receivers, Code Division Multiple Access, cellular CDMA applications, wireless LAN applications, as well as commercial and military applications.
Spread spectrum communications is a core technology for wireless systems. Future cellular systems are virtually all being designed using spread spectrum techniques. A large number of wireless LAN products are being designed using spread spectrum. Many military systems use spread spectrum. In fact the techniques were originally a military application only. In short, wireless communication engineers will almost certainly work on spread spectrum systems during their career. Since the design methods for spread spectrum and the principles behind them are significantly different from other communication systems, it is important to devote a course to the topic. Currently, spread spectrum is treated in a sporadic fashion in a few courses. Digital communications (ECE 5654) spends two weeks on the topic. A couple of other courses give a lecture or two, but even if a student were exposed to all of them, they would not have sufficient understanding of spread spectrum.
Typically offered: Spring. Program Area: Communications.
Prerequisites: 4634, 5605.
This course requires basic communication theory as well as a basic knowledge of stochastic processes. Spread spectrum communications will build on an understanding of basic modulation formats and receiver analyses. These prerequisites are satisfied by ECE 4634 (Analog and Digital Communications) or an equivalent course at another university. The course will also deal with fading processes, noise sources, and the design of random sequence generators. This requires an understanding of random variables and stochastic processes which can be satisfied by ECE 5605 (Stochastic Processes).
Department Syllabus Information:Major Measurable Learning Objectives:
- Describe the types and advantages of spread spectrum modulation formats.
- Perform analysis on the performance of spread spectrum modulation formats.
- Describe the differences and benefits of different types of spreading codes.
- Describe the differences between standard narrowband communication systems and spread spectrum systems.
- Analyze the performance of spread spectrum systems in the presence of interference.
- Analyze the performance of spread spectrum signals in the presence of multiple access interference (CDMA context).
- Describe techniques for reducing the impact of interference on spread spectrum signals.
- Analyze the performance of spreading code acquisition and tracking circuits.
- Analyze the performance of multiple access techniques based on spread spectrum (i.e., CDMA).
- Describe the major factors influencing the capacity of CDMA wireless networks.
|Introduction to Spread Spectrum||5%|
|Review of Digital Communications||5%|
|Direct Sequence Spread Spectrum||10%|
|Pseudo-random sequence generation||10%|
|Synchronization Issues for Spread-Spectrum||10%|
|Performance of Direct-Sequence Spread Spectrum||10%|
|Performance of Frequency-Hopped Spread-Spectrum||10%|
|Interference Rejection for DS/SS||10%|
|Other Wideband Techniques||5%|