Hiromi Matsuno

Low-cost antenna array via antenna switching for high resolution 2-D DOA estimation

This paper presents a method of synthesizing covariance matrix elements of array input signal for high resolution 2-D Direction-Of-Arrival (DOA) estimation via antenna (sensor) switching. Antenna array generally has the same number of array elements and receiver modules which often leads large receiver hardware cost. Two of the authors have already studied a way of antenna switching to reduce receiver cost, but it can be applied only for periodic incident signals like sinusoid. In this paper, we propose a simple method of DOA estimation from sparse data by synthesizing covariance matrix elements of array input signal via antenna switching, which can also be applied to DOA estimation of antiperiodic incident signals. Performance of the proposed approach is evaluated in detail through some computer simulation.

Cuboid array: A novel 3-D array configuration for high resolution 2-D DOA estimation

This paper presents a novel 3-D cuboid array configuration which enables high resolution 2-D DOA estimation. The authors have already proposed a 3-D array configuration which improves the elevation estimation accuracy, but the array configuration cannot estimate DOAs of correlated waves. The proposed cuboid array configuration has almost the same DOA estimation performance as that of the conventional 3-D array configuration for uncorrelated waves, and can estimate DOAs of coherent waves where the conventional configuration is unable to do so. Performance of the proposed 3-D cuboid array configuration is evaluated through a computer simulation.

An omni-directional slim polarization diversity antenna for cellular base station

In this paper, an omni-directional slim polarization diversity antenna for cellular system is designed. The vertical polarization antenna with substrate construction and the horizontal polarization antenna with cylindrical construction match well. The configuration of polarization diversity antenna is optimized by E-field distribution and high isolation more than 25dB is obtained. The diameter of designed polarization diversity antenna is 0.14λ and it is smaller than that of present system.

Antenna switching based on the relation between the relative location of array elements for high resolution 2-D DOA estimation

This paper presents a method of synthesizing covariance matrix elements of array input signal based on the relation between the relative location of array elements for high resolution 2-D Direction-Of-Arrival (DOA) estimation. Antenna array generally has the same number of array elements and receiver modules which often leads large receiver hardware cost. The authors have already studied a way of antenna switching to reduce receiver cost based on the relation between the absolute location of array elements, but the receiver cost is still large and needs to be further reduced. In this paper, we propose a method of DOA estimation from sparse data by synthesizing array covariance matrix elements, via antenna switching based on the relation between the relative location of array elements. Performance of the proposed approach is evaluated in detail through computer simulation.