An ESPAR antenna transmitter and a multiple OFDM symbols transmitting method in a beamspace MIMO environment are disclosed in the present invention. According to an embodiment of the present invention, the method for transmitting independent multiple OFDM symbols through an ESPAR antenna transmitter in a beamspace MIMO system comprises the steps of: calculating, under a plurality of constraints, a variable for minimizing a difference between a first current value and second current values, wherein the first current value is calculated by mapping a matrix representing a beam pattern of the beamspace MIMO system with respect to the multiple OFDM symbols, and the second current values are implemented through the ESPAR antenna transmitter and respectively applied to an active antenna and a plurality of parasitic antennas disposed around the active antenna; and transmitting the multiple OFDM symbols by applying the calculated variable with respect to the ESPAR antenna transmitter. At this case, the variable includes the matrix representing the beam pattern, a voltage value applied to the active antenna through an RF chain connected to the active antenna, and an impedance load connected to the parasitic antenna.

Ofdm symbol transmiting using espar antenna in beamspace mimo system

According to an embodiment of the present invention, an apparatus for estimating antenna information on an MIMO radar, comprises: a first radio wave sensor for measuring a signal transmitted by a target multi-input multi-output (MIMO) radar at a predetermined position; a second radio wave sensor for measuring a signal while moving in a direction away from the predetermined position; a correlation unit for calculating a correlation value between a first measurement signal measured by the first radio wave sensor and a second measurement signal measured by the second radio wave during movement; and a calculation unit for estimating the number of antennas of the target MIMO radar by comparing the calculated correlation value with a reference table storing correlation values in accordance with the number of antennas used by the MIMO radar.

Mimo apparatus and method for determining antenna information of mimo radar

The present invention relates to an antenna device for a beam space MIMO system. The present invention comprises: a power feeding unit for providing RF signals; a reactance control unit for controlling the value of reactance; an active antenna element, connected to the power feeding unit via a power feeding point, for receiving the RF signals from the power feeding unit; at least one pair of parasitic antenna elements of which the reactance values are controlled by the reactance control unit; and a substrate where the parasitic antenna elements and active antenna element are formed. According to the disclosed specification, the antenna device for a beam space MIMO system is capable of performing as much as MIMO by RF front-end less than the existing MIMO by securing multiple radiation patterns with low interference in a limited space, thereby realizing low complexity and low power and minimizing a communication device.

A planar type antenna apparatus for beamspace mimo system

An impedance matching method of an active antenna in a beam space MIMO system according to the present invention relates to a method for matching the impedance of the active antenna and the output impedance of a power amplifier in the beam space MIMO system comprising the power amplifier, the active antenna, and a plurality of parasitic antennas. The impedance matching method of the active antenna in the beam space MIMO system comprises: a step for determining a signal transmitted by the beam space MIMO system; a step for determining the voltage applied to the active antenna in order that the impedance of the active antenna reaches a predetermined value; and a step for applying the determined voltage to the active antenna through a feeding point. The impedance matching method of the active antenna according to the present invention can determine that the impedance value of the active antenna is to be 50Ω. The step for determining the voltage applied to the active antenna can determine the voltage applied to the active antenna based on the sum of signals to be transmitted. The impedance matching method of the active antenna in the beam space MIMO system according to the present invention is provided to control the voltage applied to the active antenna in the beam space MIMO system, and match the impedance with the power amplifier by using a simple method, thereby maximizing the efficiency of the power amplifier, and miniaturizing the system by reducing the complexity of an RF end in the beam space MIMO system.

A method for impedance matching of active antenna in beam space mimo system

A load-modulated beamspace multiple input multiple output (MIMO) antenna device according to an embodiment of the present invention comprises: a conductive substrate; a resin insulation layer which is formed by covering one or both surfaces of the conductive substrate; a plurality of slots which are formed by a portion of the conductive substrate which is not covered by the resin insulation layer to be exposed; a plurality of through-holes which are formed to penetrate the conductive substrate and the resin insulation layer; and a plurality of radiators which are formed on the resin insulation layer, wherein power is supplied from a single RF power source via the through-holes. The load-modulated beamspace MIMO antenna device according to the present invention is an antenna device used for a load-modulated beamspace MIMO system which supplies power to a plurality of antennas by sharing single RF power and forms a radiating pattern corresponding to a transmission signal by controlling an admittance loaded on respective antennas. According to the present invention, coupling among antennas can be minimized by decreasing correlation among radiating patterns due to a plurality of antennas. Also, operation stability is improved by reducing effects by a peripheral environment, and it is possible to integrate a plurality of antennas in a small space.

Choi Il Do

Papers

A planar type antenna apparatus for beamspace mimo system

A method for impedance matching of active antenna in beam space mimo system

An antenna apparatus for load-modulated beamspace mimo system