NDLI: An adaptive array antenna with optimally formed beams for CDMA

Content Provider	IEEE Xplore Digital Library
Author	Weiren Dong Jie Dong Yuan Yu
Copyright Year	2000
Description	Author affiliation: Beijing Univ. of Posts & Telecommun., China (Weiren Dong)
Abstract	The adaptive antenna (AA) or smart antenna for mobile telecommunication especially for code division multiple access (CDMA) systems has developed at an extraordinary pace. Most professional people and related papers centered their attention on the so-called "optimum combining (OC)" AA which is represented by algorithms using least mean squares (LMS) and recursive least squares (RLS). These types of AA were able to provide an optimum signal to interference plus noise ratio (SINR), through the use of a desirable antenna radiation pattern whose mainlobe pointed towards the desired signal while the nulls pointed towards the source of interference. For computing these adaptive algorithms, the requirements of the CPU time and the memory usage are proportional to the number of antenna elements, and speed of computations depends on the velocity of the mobiles. Finally, there is a restriction on the number of users. In order to avoid the above shortcomings, this paper proposes a type of AA which is close to the category of "direction finding (DF)" AA, but it is a "beam forming in advance" array antenna with super low sidelobes. This AA possesses similar adaptive functions as found in the OCAA, but without the computation of complex weight vectors. When this AA is operating only a few computational procedures are needed. Another advantage of this AA is that it does not mind whether the number of users M is much larger than the number of antenna elements N or not.
Starting Page	426
Ending Page	430
File Size	288046
Page Count	5
File Format	PDF
ISBN	0780363779
DOI	10.1109/ISAPE.2000.894815
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-08-15
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Adaptive arrays Antenna arrays Multiaccess communication Mobile antennas Interference Signal to noise ratio Least squares approximation Least squares methods Resonance light scattering Antenna radiation patterns
Content Type	Text
Resource Type	Article

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