Efficient Array Processing for Partial Signal Coherence

With the growing use of antenna arrays for enhancing signal detection, estimation, interference cancellation, and position location comes the need to better understand the spatial properties of the received signals. To allow for simple and efficient implementation required in real-time processing applications, conventional array processing algorithms assume perfect coherence of the signal wavefronts. Unfortunately this assumption is clearly inappropriate, because many kinds of dispersion phenomena make the received signals exhibit a limited spatial coherence. The causes of such spatial coherence degradation can be attributed to either complex multipath propagation or to mechanical deformations in the array itself. Optimally dealing with partial signal coherence typically requires modeling the array response as random, leading to complicated combining schemes to achieve optimal performance. The optimal detector is uniquely different than conventional detectors in that it involves both matrix combining and beamsteering of the matched-filter outputs. We show that the discrete Fourier transform can simultaneously serve as an asymptotically optimal spatial combiner and beamsteering tool for uniform linear arrays suffering from partial coherence. Simulation results show that the proposed combining scheme provides not only a significant gain in performance over conventional methods, but near-optimal performance at significantly less computation, even for arrays of modest size. Hence this thesis provides an important advance in statistical signal array processing by providing an efficient and versatile technique for coping with partial spatial signal coherence.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Electrical Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Rao, Anil M.

Contributors dc:contributor

• Jones, Douglas L.

• Engineering, Electronics and Electrical

Language dc:language

eng

Identifier

(MiAaPQ)AAI3017190

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/80718