5 research outputs found
Investigative study of planar array ambiguities based on "hyperhelical" parameterization
Published versio
Manifold studies of nonlinear antenna array geometries
Published versio
Array communications in wireless sensor networks
Imperial Users onl
Spatiotemporal arrayed MIMO radar
In the last decade, Multiple Input Multiple Output (MIMO) radar has emerged
as a leading candidate for stimulating major new advancement in radar theory.
A fundamental challenge in MIMO radar is to identify a theoretical framework
within which the radar system may be represented and analysed. In the relatively well-established field of Single Input Multiple Output (SIMO) array signal
processing, this task has already been achieved using the array manifold (which
is a geometric object that completely characterises the array system). A central
objective of this thesis is therefore to bridge the gap between SIMO and MIMO
by developing a manifold representation of the MIMO radar system.
A new differential geometric framework, based on the complex Cartan matrix,
is exploited in this thesis for characterising array manifold curves. New formulas
are presented for recursively calculating the strictly orthonormal moving frame,
U(s), and corresponding complex Cartan Matrix, C(s), for arbitrary array geometries. The circular approximation of the array manifold is derived under this
new framework and compact closed-form expressions are provided for the popular
uniform linear array geometry.
Based on a number of approximations derived using the circular approximation of the array manifold, the performance capabilites of various popular detection and parameter estimation algorithms are investigated. The figure of merit "C" is then used to place these capabilities into the context of the theoretically
ideal algorithm.
The concept of a virtual SIMO array system is used as a basis for characterising the full MIMO radar configuration using a single equivalent response vector.
By tracing out this response vector across the whole parameter space, a manifold
is formed that fully characterises the MIMO radar system. In the important case
of orthogonal transmit waveforms, the fundamental performance bounds of the
MIMO radar system are studied.
A space-time receiver architecture is proposed which exploits the virtual SIMO
structure as part of a subspace-based joint Doppler, delay and direction of arrival (DOA) estimation framework. Due to the great computational burden of an
exhaustive 3-parameter search, the joint Doppler-delay-DOA estimation is partitioned into an equivalent two-stage algorithm. The proposed approach is evaluated via computer simulation studies and shown to outperform existing methods.Open Acces
Applications of Continuous Spatial Models in Multiple Antenna Signal Processing
This thesis covers the investigation and application of continuous spatial models for multiple antenna signal processing. The use of antenna arrays for advanced sensing and communications systems has been facilitated by the rapid increase in the capabilities of digital signal processing systems. The wireless communications channel will vary across space as different signal paths from the same source combine and interfere. This creates a level of spatial diversity that can be exploited to improve the robustness and overall capacity of the wireless channel. Conventional approaches to using spatial diversity have centered on smart, adaptive antennas and spatial beam forming. Recently, the more general theory of multiple input, multiple output (MIMO) systems has been developed to utilise the independent spatial communication modes offered in a scattering environment. ¶ ..