Abstract:
The present invention provides an RF MEMS switch using a fine liquid metal droplet, which can quickly be operated and strong to impact and movements. According to one embodiment of the present invention, the RF MEMS switch using the fine liquid metal droplet comprises: a first layer member which includes a signal transmission line; a second layer member which is disposed on the first layer member, forms a chamber in order to induce a shape change of the fine liquid metal droplet by coping with the signal transmission line, and forms a through hole on one side of the chamber in order to contact or non-contact the signal transmission line with the fine liquid metal droplet of which shape is changed in the chamber; an operating member which is disposed on the second layer member, and is positioned on the open side of the chamber in order to provide the power of the shape change to the fine liquid metal droplet through the open side of the chamber; and a third layer member which sets the position of the operating member, and is coupled with the first layer member and the second layer member.
Abstract:
Provided are an apparatus and method for improving high-power signal receiving performance using low-power signals. The apparatus and the method of the present invention hierarchically modulate primary service data and supplementary information data for supplementing the primary service data, and transmit the modulated data. The primary service data can be modulated into high-power signals and transmitted, and the supplementary information data can be modulated into low-power signals and transmitted.
Abstract:
Provided is a 3-way balun for a double balanced mixer. This research provides a 3-way balun available for a planar-type double balanced mixer and a planar-type double balanced mixer employing the same. The 3-way balun includes a first output unit for receiving and outputting an input signal of a predetermined frequency; and second and third output units connected to the first output unit and outputting signals whose phase is different by 180 from a phase of a signal of the first output unit and amplitude is a half of an amplitude of the signal outputted from the first output unit.
Abstract:
The present invention relates to a technique relating to a method and apparatus for generating, transmitting, and receiving a data frame having a newly proposed format in a wireless communication system. According to the technique, the method for generating a data frame in a wireless communication system comprises the following steps: generating at least one first subframe; generating at least one second subframe; and generating a data frame including the first and second subframes, wherein the first and second subframes include length information of a MAC protocol data unit (MPDU) contained in the first and second subframes, and the length information of the MPDU contained in the second subframe is zero.
Abstract:
The present invention relates to a method and apparatus for transmitting and receiving data. A data transmission method from a sender terminal to a receiver terminal in a MIMO system using a variable frequency band according to one embodiment of the present invention comprises: repeatedly generating a signal field depending on a frequency band that is applied to the transmission of a data frame; generating a data field including the data; generating a data frame including the signal field and the data field; and transmitting the data frame to the receiver terminal. The present invention is advantageous in that a signal field which is transmitted together with the data being transmitted from the sender terminal to the receiver terminal in the MIMO system can be sent more efficiently.
Abstract:
The present invention relates to a mobile multicast system and a method thereof, and more particularly to a network-based mobility multicast system and a method thereof. The system according to one embodiment of the present invention is the mobile multicast system for supporting the network-based mobility comprising: access points which communicate with mobile terminals within an access network through a wireless channel, obtains layer 2 addresses of the terminals, and provides the obtained layer 2 addresses of the terminals; management parts which control a handover of each terminal included in the access points, transmit multicast packets to be provided to the terminals, and are provided according to the access points; a router which receives the multicast data through the network, and transmits the multicast packets to the terminals for receiving the multicast data; and a mobile control server which obtains position information of the terminals from the management parts, transmits a query message for determining the reception of the multicast data to each of the management parts so as to confirm whether the terminals join the multicast when receiving the query message from the router, and controls setting of a tunnel between the router and the management part for transmitting a membership report message when receiving the membership report message for joining the multicast.
Abstract:
Disclosed is an integrated voice/audio encoding/decoding apparatus whereby the overlap region of a window is adjusted based on the transition interval. In the present invention, encoding is carried out by making windows of relatively long length overlap in order to increase the efficiency of encoding, while the overlap region of the windows is reduced in accordance with the transition interval when there is a transition interval between frames, thereby making it possible to reduce the occurrence of noise due to transition intervals.
Abstract:
Disclosed is a technique related to a method for controlling synchronization by correcting data transmission time or frequency offset, and to a station. According to the technique, a method for controlling the synchronization of a first terminal for data transmission/reception in a coordinated communication system comprises: a step of transmitting a first request frame and a second request frame containing transmission time information for each of a first response frame and a second response frame to a second terminal and to a third terminal, respectively; a step of receiving the first response frame and the second response frame from the second terminal and the third terminal; a step of estimating a first propagation delay time between the first terminal and the second terminal and a second propagation delay time between the first terminal and the third terminal, using the time of receiving the first response frame and the second response frame; and a step of transmitting, to the second terminal, a third request frame containing information on the delay time difference between the first propagation delay time and the second propagation delay time.
Abstract:
The present invention relates to a relay apparatus for transmitting ancillary data and to a method for same, and particularly, to a relay apparatus for transmitting ancillary data for a terrestrial digital television broadcast and to a method for same. The apparatus according to one embodiment of the present invention comprises: a relay apparatus for relaying a digital broadcast (DTV) signal containing ancillary data; a receiving and processing unit for receiving the ancillary data and DTV signal via a receiving antenna, down-converting the received signal into an intermediate frequency (IF) signal, and demodulating the IF signal; an equalizing unit for removing noise and a multipath signal from the signal output from the receiving and processing unit, and outputting the resulting signal; an ancillary data extraction unit for extracting the ancillary data from the signal output from the equalizing unit, and outputting the extracted ancillary data; an adder for adding the output from the ancillary data extraction unit to the DTV signal output from the equalization unit; and a transmitting and processing unit for modulating the output from the adder, up-converting the modulated output into a transmitting RF band, amplifying the transmitting power, and transmitting the amplified power via a transmitting antenna.
Abstract:
Disclosed is a technique for performing communication using ultrasonic waves in an environment in which radio waves are severely blocked and thus wireless communication is difficult to perform. According to the present invention, in an environment in which radio waves are severely blocked, a terminal using ultrasonic waves transmits ultrasonic waves via a solid structure serving as a medium, and a base station using ultrasonic waves receives ultrasonic waves via a solid structure serving as a medium.