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Application of Antenna Arrays to Mobile Communications, Part II: Beam-Forming and Direction-of-Arrival Considerations
Abstract:
Array processing involves manipulation of signals induced on
various antenna elements. Its capabilities of steering nulls to
reduce cochannel interferences and pointing independent beams
toward various mobiles, as well as its ability to provide estimates
of directions of radiating sources, make it attractive to a mobile
communications system designer. Array processing is expected
to play an important role in fulfilling the increased demands of
various mobile communications services. Part I of this paper
showed how an array could be utilized in different configurations to
improve the performance of mobile communications systems, with
references to various studies where feasibility of an array system
for mobile communications is considered.
This paper provides a comprehensive and detailed treatment
of different beam-forming schemes, adaptive algorithms to adjust
the required weighting on antennas, direction-of-arrival estimation
methods—including their performance comparison—and effects of
errors on the performance of an array system, as well as schemes
to alleviate them. This paper brings together almost all aspects of
array signal processing. It is presented at a level appropriate to
nonexperts in the field and contains a large reference list to probe
further.
Keywords— Beam forming, conjugate gradient method, eigenstructure
methods, ESPRIT, least square algorithm, linear prediction
method, maximum entropy, maximum likelihood method,
minimum norm, mobile communications, multipath arrivals, MUSIC,
MVDR estimator, neural networks, recursive least square
algorithm, weighted subspace fitting. |
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发表于 2010-4-7 16:12:39
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