TY - JOUR
T1 - Uniform circular arrays for smart antennas
AU - Ioannides, Panayiotis
AU - Balanis, Constantine
N1 - Funding Information:
The ?uthors would like to th?nk th? Cyprus Fulbright Commission ?nd the Nation?l Science Foundation, und?r Gr?nt No. 0355255, for the support of this work.
PY - 2005/8
Y1 - 2005/8
N2 - As the growing demand for mobile communications constantly increases, the need for better coverage, improved capacity, and higher transmission quality rises. Thus, a more efficient use of the radio spectrum is required. Small antenna systems are capable of efficiently utilizing the radio spectrum and, thus, hold a promise for an effective solution to the present wireless systems' problems, while also achieving reliable and robust high-speed high-data-rate transmission. Although numerous studies for smart antennas have already been conducted using rectilinear arrays, including mostly uniform linear arrays (ULAs) and uniform rectangular arrays (URAs), not as much effort has been devoted to other configurations. In this paper, the performance of smart antennas with uniform circular arrays (UCAs) is examined. A profound justification for this selection is the symmetry possessed by uniform circular arrays. This property provides uniform circular arrays with a major advantage: the ability to scan a beam azimuthally through 360/spl deg/with little change in either the beamwidth or the sidelobe level. With the use of uniform circular arrays, the two main issues related to smart antennas - estimation of the direction of arrival from incoming signals and beamforming - are both examined.
AB - As the growing demand for mobile communications constantly increases, the need for better coverage, improved capacity, and higher transmission quality rises. Thus, a more efficient use of the radio spectrum is required. Small antenna systems are capable of efficiently utilizing the radio spectrum and, thus, hold a promise for an effective solution to the present wireless systems' problems, while also achieving reliable and robust high-speed high-data-rate transmission. Although numerous studies for smart antennas have already been conducted using rectilinear arrays, including mostly uniform linear arrays (ULAs) and uniform rectangular arrays (URAs), not as much effort has been devoted to other configurations. In this paper, the performance of smart antennas with uniform circular arrays (UCAs) is examined. A profound justification for this selection is the symmetry possessed by uniform circular arrays. This property provides uniform circular arrays with a major advantage: the ability to scan a beam azimuthally through 360/spl deg/with little change in either the beamwidth or the sidelobe level. With the use of uniform circular arrays, the two main issues related to smart antennas - estimation of the direction of arrival from incoming signals and beamforming - are both examined.
KW - Adaptive arrays
KW - Antenna arrays
KW - Array signal processing
KW - Circular arrays
KW - Direction of arrival estimation
KW - ESPRIT
KW - Land mobile radio cellular systems
KW - MUSIC
KW - Smart antennas
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U2 - 10.1109/MAP.2005.1589932
DO - 10.1109/MAP.2005.1589932
M3 - Article
AN - SCOPUS:33244475599
SN - 1045-9243
VL - 47
SP - 192
EP - 206
JO - IEEE Antennas and Propagation Magazine
JF - IEEE Antennas and Propagation Magazine
IS - 4
ER -