Abstract: An antenna apparatus for drone identification and an operating method thereof are provided. The antenna apparatus includes: a plurality of horizontal directional antennas; a vertical directional antenna positioned at a center of an area surrounded by the plurality of horizontal directional antennas; a beamforming unit controlling beamforming of the vertical directional antenna and the plurality of horizontal antennas to transmit and receive signals in all directions; and a power supply unit for suppling power.

Abstract: An antenna apparatus for drone identification and an operating method thereof are provided. The antenna apparatus includes: a plurality of horizontal directional antennas; a vertical directional antenna positioned at a center of an area surrounded by the plurality of horizontal directional antennas; a beamforming unit controlling beamforming of the vertical directional antenna and the plurality of horizontal antennas to transmit and receive signals in all directions; and a power supply unit for suppling power.

Abstract: An identification method and an unmanned aerial vehicle (UAV) detection apparatus are provided. The identification method, as a method for preventing a collision that may occur in a process of detecting and identifying a plurality of UAVs flying in the air, detects a plurality of UAVs in the air and determines a legitimacy of flight of each of the plurality of UAVs using an identification information request message.

Abstract: An interference alignment method using multiple antennas in a multi-cell overlapped environment, includes: when at least one transmission and reception ends having at least one or more antennas communicate with each other, establishing at least one or more channels from the transmission end to the reception end. Further, the interference alignment method includes designing a processing filter for a transmission signal transmitted from the transmission end to the reception ends; and designing a processing filter for a reception signal that is received by the reception end.

Abstract: Disclosed is a method for removing signal interference in a MIMO-based interference removing apparatus including transmitting a reference signal to at least one receiver; if channel information is estimated by the receiver, receiving the estimated channel information from the receiver as a feedback signal; and producing transmission pre-coding matrix, beam forming matrix, and weighted matrix using the received channel information. Further, the method includes transmitting information containing the transmission pre-coding matrix, the beam forming matrix, and the weighted matrix by including them in a pilot signal to the receiver, and the MIMO-based interference removing apparatus comprises at least one transmitter.

Abstract: A method comprising: determining, by a transmitter, a fixed number of effective IAI channels; estimating, by a receiver, channel information H through information provided from the transmitter; sharing, by a receiver, the channel information among a plurality of receivers that are belonging to a same BSS (Basic Service Set); calculating effective IAI channel information q and decoding vector u using the channel information; feeding back the calculated effective IAI channel information q and decoding vector u to the transmitter; and calculating, by the transmitter, a transmitting precoding vector, after sharing the fed-back effective IAI channel information q and decoding vector u, and the channel information H among a plurality of other transmitters.

Abstract: Disclosed is a method for removing signal interference in a MIMO-based interference removing apparatus including transmitting a reference signal to at least one receiver; if channel information is estimated by the receiver, receiving the estimated channel information from the receiver as a feedback signal; and producing transmission pre-coding matrix, beam forming matrix, and weighted matrix using the received channel information. Further, the method includes transmitting information containing the transmission pre-coding matrix, the beam forming matrix, and the weighted matrix by including them in a pilot signal to the receiver, and the MIMO-based interference removing apparatus comprises at least one transmitter.

Abstract: A method for a partial interference alignment in a multi-antenna communication system includes, checking the number of access points (APs) operating at the same channel or adjacent channel; and calculating LIPs (Leakage Interference Power) that the respective APs have an effect on each base-station (STA). Further, the method includes choosing the upper three AP-STA pairs having the highest LIP in order as a candidate group for interference alignment; and performing a partial interference alignment on the candidate group for interference alignment.

Abstract: An apparatus for controlling a near field wireless network, includes a wireless network controller included in a management plane of a wireless access point and configured to observe wireless physical layer/media access controller layer (PHY/MAC) protocols and perform a management procedure on wired MAC/PHY protocols within the wireless access point. Further, the apparatus includes a wireless network central management unit included in a management plane of a switch and configured to perform a management procedure on the wired MAC/PHY protocols within the switch.

Abstract: An interference alignment method using multiple antennas in a multi-cell overlapped environment, includes: when at least one transmission and reception ends having at least one or more antennas communicate with each other, establishing at least one or more channels from the transmission end to the reception end. Further, the interference alignment method includes designing a processing filter for a transmission signal transmitted from the transmission end to the reception ends; and designing a processing filter for a reception signal that is received by the reception end.

Abstract: An apparatus for grouping a plurality of stations in a multi-transmission environment includes an SNR (Signal to Noise Ratio) measuring unit configured to measure SNR values of the stations existing in the multi-transmission environment. Further, the apparatus includes a grouping unit configured to group the stations into several subgroups depending on the SNR values, wherein a leader is defined in each subgroup. Furthermore, the apparatus includes a control unit configured to determine an MCS (Modulation and Coding Scheme) intended for each subgroup and form different A-MPDU (Aggregated MAC Protocol Data Unit) for each subgroup separately to send to each subgroup in a multicast transmission.