Unitary Space-Time Transmit Diversity for Multiple Antenna Self-Interference Suppression

• Main Author: Anderson, Adam Lane
• Format: Others
• Published: BYU ScholarsArchive 2004
• Subjects: unitary space-time codes; Alamouti; differential; multiple antenna; gray encoding; antenna interference; SOQPSK; Electrical and Computer Engineering
• Online Access: https://scholarsarchive.byu.edu/etd/154; https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=1153&context=etd

A common practice for government defense agencies and commercial aeronautical companies is to use dual antennas on test flight air vehicles in order to overcome occlusion issues during high-speed telemetric maneuvers. The dual antennas, though never being masked at the same time, unfortunately lead to a drastic increase in nulls in the signal pattern. The result of this interference pattern can be compared to the effect of fading in a multiple-input multiple-output (MIMO) multi-path scattering environment. Confidence in this comparison leads to the use of unitary space-time MIMO codes to overcome the signal self-interference. The possibility and performance of several of these codes will be examined. Such criteria as training for channel estimation, use of shaped offset quadrature phase shift keying (SOQPSK), hardware facility, and data throughput will be compared for each code. A realistic telemetry channel will be derived to increase accuracy of simulated results and conclusions.