Date of Award

2016

Document Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

Electrical and Computer Engineering

Committee Chair

Laurie L. Joiner

Committee Member

David W. Pan

Committee Member

Adam Panagos

Committee Member

John L. Stensby

Committee Member

Sivaguru S. Ravindran

Subject(s)

Bell Telephone Laboratories., Spread spectrum communications., Space time codes., MIMO systems.

Abstract

This research introduced Frequency Hopping Spread Spectrum (FHSS) into Diagonal Bell Laboratories Layered Space-Time Multiple Input Multiple Output (D-BLAST MIMO) architecture—specifically to a wireless communication system that experiences single interference, as well as classical noise. In Frequency Hopping Spread Spectrum architecture the carrier frequency is hopped between multiple frequencies with the intention that the interference will affect only a subset of the hop frequencies. Diagonal BLAST MIMO architecture has high data rate due to the multiple antenna elements at both the transmitter and receiver. In this research the two technologies were merged to provide a robust system with high data rate. It is worth noting that all antenna elements are tuned to the same hop frequency. The FH D-BLAST MIMO architecture was evaluated by observing the receiver’s signal-to-impairments ratios, capacity, and received message bit error rates. The evaluation was performed for various probabilities of the signal being affected by interference with various interference powers, and for various received signal-to-noise ratios. To facilitate message bit error rates, a Low Density Parity Check (LDPC) code and Binary Phase Shift Keying (BPSK) modulation was used. The proposed FH D-BLAST MIMO architecture's message bit error rates were compared to that of non-frequency hopping D-BLAST MIMO, and Single Input Single Output (SISO) system. Moreover, Minimum Mean Square Error (MMSE)--also known as Wiener-Hopf matrix--processing, and sequential decoding was used at the receiver to deconflict the multiple transmitted streams.

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