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.
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.
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.
Percentage of Course
|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%|