ECE: Electrical & Computer Engineering

ECE 6634 Multi-Channel Communications


Fall 2016 textbook list

The Fall 2016 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.

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ECE 6634 Multi-Channel Communications (3C)

In-depth study of modern multi-channel communications techniques, primarily multi-antenna systems (known as multiple-input multiple-output or MIMO) and Orthogonal Frequency Division Multiplexing (OFDM). Specifically the course examines multi-antenna techniques such as transmit and receive diversity, beamforming (including eigen-beamforming), and spatial multiplexing. Within the area of OFDM we examine modulation/demodulation, carrier bit loading, mitigating multipath, frequency-domain equilization, peak-to-average power reduction, and frequency offset mitigation. As time permits we will also investigate a third multi-channel technique know as multi-user scheduling or packet access networks.

What is the reason for this course?

OFDM has become ubiquitous as a technique for wireless communications. However, since it is an advanced technique we only touch on the topic in the introductory graduate level digital communications course, 5654. MIMO techniques are also fast becoming standard in wireless communications and are still the subject of substantial research. Thus, these two techniques which are introduced in earlier courses, require a more in-depth study.

Typically offered: Fall. Program Area: Communications.

Prerequisites: 5605, 5654.

Why are these prerequisites or corequisites required?

This course requires an in-depth background in communication theory as well as a strong background in stochastic processes. The relevant communication theory can be learned only at the graduate level or above. Stochastic processes are not introduced until the first year of graduate studies. These 5000-level prerequisites justify its level.

Department Syllabus Information:

Major Measurable Learning Objectives:
Course Topics
Topic Percentage
1. Multi-antenna and OFDM Channel Models 5%
2. Channel Capacity 5%
3. Diversity and Fading - Performance analysis 10%
4. Beam-forming - Optimal weights; adaptive algorithms 10%
5. Orthogonal Space-Time Block Codes and S-T Trellis Codes 10%
6. Spatial Multiplexing 5%
7. Hybrid MIMO Techniques 5%
8. OFDM - Introduction and performance analysis 10%
9. Degradation of OFDM due to Doppler-induced Inter-Carrier Interference 10%
10. Multipath, the Cyclic Prefix and guard intervals 10%
11. Adaptive Modulation and Bit Loading 5%
12. Peak-to-Average Reduction 5%
13. OFDMA 5%
14. Applications 5%

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