Patent application number | Description | Published |
20100040129 | CHANNEL EQUALIZATION AND CARRIER RECOVERY METHOD AND RECEIVER IN HIGH SPEED WIRELESS COMMUNICATION SYSTEM - Provided are a channel equalization and carrier recovery method and a receiving apparatus thereof. In the method, a receiver of the high speed wireless communication system obtains an initial value of a channel equalization coefficient through non-causal channel estimation in a frequency domain during a preamble transmission section of a packet. High-order QAM signal correction for updating the channel equalization coefficient in a time domain is performed during a data transmission section of the packet. when a payload section starts in the data transmission section of the packet, channel equalization coefficient tracking is performed on the basis of frequency domain decision, and a hard decision of a correction value by the high-order QAM signal correction in the time domain is made to correct carrier phase errors, so that the channel equalization coefficient is updated. | 02-18-2010 |
20100135431 | MODULATING DEVICE AND METHOD, DEMODULATING DEVICE AND METHOD - A modulation device uses two base signal axes including a cosine function and two base signal axes including a sine function to modulate bit information and generate a modulation symbol. Accordingly, the frequency efficiency characteristic is improved while maintaining a great power efficiency characteristic. | 06-03-2010 |
20100268752 | APPARATUS AND METHOD FOR ESTIMATING HIGH-INTEGRATION, HIGH-SPEED AND PIPELINED RECURSIVE LEAST SQUARES - Provided is an apparatus and method for estimating high-integration, high-speed and pipelined RLSs. Pipeline characteristics are given to an RLS algorithm to provide a high-speed HIP-RLS estimation apparatus. The HIP-RLS estimation apparatus has higher integration level than a conventional CORDIC-based RLS estimation apparatus. Thus, the use of the HIP-RLS estimation apparatus can reduce a chip size, thereby making it possible to fabricate more chips using the same wafer. Also, the HIP-RLS estimation apparatus is suitable for high-speed wireless communication because it has a high signal processing speed. | 10-21-2010 |
20110205911 | SYSTEM FOR CHANNEL SOUNDING OF BROADBAND SIGNAL CARRIER MOBILE COMMUNICATIONS AND METHOD THEREOF - Provided are a system for channel sounding of broadband single carrier mobile communications and a method thereof. A channel sounding device is provided, which achieves precise modeling of a broadband mobile communication in a 5 GHz band. The channel sounding device can perform precise channel modeling by collecting broadband channel data of 20 MHz between a base station and a mobile station moving at maximum 150 km/h, using a sounding signal including a 802.15.3 preamble, a maximum length sequence (MLS) signal, and a single carrier frequency domain equalization (SC-FDE) symbol overcoming a limitation of signal distortion of an orthogonal frequency division multiplexing (OFDM) signal. The channel sounding device can simultaneously perform modeling of interference of an adjacent channel as well as a transmission channel. | 08-25-2011 |
20140313911 | APPARATUS AND METHOD FOR CONTROLLING BASIC SERVICE SET AREA - An apparatus and method for controlling a BSS area are disclosed. The apparatus includes a generation unit, a coordinate extraction unit, a calculation unit, a path loss calculation unit, a characteristic classification unit, a transmitted signal strength calculation unit, and a control unit. The generation unit receives SSIDs, and generates a collected device list. The coordinate extraction unit extracts the coordinates of an SSID corresponding to a specific location beacon device. The calculation unit calculates a straight-line distance between the specific location beacon device and another location beacon device. The path loss calculation unit calculates a measured path loss value. The characteristic classification unit classifies the characteristic of a link. The transmitted signal strength calculation unit calculates transmitted signal strength. The control unit performs control so that a location beacon device other than the specific location beacon device is prevented from operating in a BSS area. | 10-23-2014 |
Patent application number | Description | Published |
20120057481 | SYSTEM AND METHOD FOR MEASURING ROUND TRIP TIME BASED ON WIRELESS LOCAL AREA NETWORK - A RTT measurement system includes first and second signal time measuring devices respectively connected to two wireless LAN devices and a RTT estimator. Each one of the first and second signal time measuring devices senses a transmitted signal from a corresponding WLAN device and a corresponding received signal and measures a signal time difference between the transmitted signal and the received signal. The RTT estimator estimates a RTT using the measured signal time differences at the first and second signal time measuring devices. | 03-08-2012 |
20120057651 | TRANSMISSION APPARATUS AND METHOD - A transmission apparatus selects a single transmission channel through which a transmission signal is to be transmitted from among unoccupied available channels, forms the transmission signal so as to alleviate interference with adjacent channels according to occupancy states of an upper adjacent channel and a lower adjacent channel adjacent to the transmission channel, and transmits the transmission signal. | 03-08-2012 |
20120122475 | METHOD AND APPARATUS FOR ESTIMATING POSITION OF ACCESS POINT IN WI-FI SYSTEM - A method and apparatus for estimating a position of an access point (AP) in a Wi-Fi system is provided. The method includes measuring a strength of a signal, transmitted by the AP, at three or more measurement points (MPs), selecting an imaginary attenuation factor, calculating a range between the AP and each of the MPs on the basis of the imaginary attenuation factor and a strength of a signal measured at the MP, calculating an intersecting point of ranging circles in each of which a position of the MP is a center and the range between the MP and the AP is a radius, calculating a best intersecting point from among a plurality of the intersecting points obtained by repeating the calculating the range and the calculating the intersecting point of ranging circles while changing the imaginary attenuation factor, and estimating the best intersecting point as the position of the AP. | 05-17-2012 |
20120155716 | BIOMETRIC INFORMATION MEASUREMENT APPARATUS AND METHOD USING USER TERMINAL - Disclosed herein is a biometric information measurement apparatus using a user terminal. The biometric information measurement apparatus includes a light-emitting control unit, a camera, an image analysis unit, and a biometric information measurement unit. The light-emitting control unit controls the output of an optical signal from at least one light emitting element which outputs the optical signal to a part of a body of a user. The camera is to be placed to face the part of the body, and configured to capture light generated in such a way that the optical signal passes through the part of the body or the optical signal is reflected off of the part of the body. The image analysis unit analyzes an image captured using the camera. The biometric information measurement unit measures biometric information about the user based on the results of the image analysis. | 06-21-2012 |
20120314643 | MULTICASTING SYSTEM AND METHOD FOR VEHICULAR COMMUNICATION NETWORK - Disclosed herein are a multicasting system and method for a vehicular communication network. The multicasting system includes a plurality of roadside communication devices for communicating with a plurality of vehicular communication devices. Each of the roadside communication devices includes a communication unit for communicating with the plurality of vehicular communication devices and at least one neighboring roadside communication device, a beacon analysis unit for analyzing beacon frames when a slot allocation request is received from one of the vehicular communication devices, a determination unit for searching for a period in which a slot has not been allocated and determining whether a period for allocation of a slot to the vehicular communication device is present, and a slot allocation unit for allocating a slot period for multicasting of the vehicular communication device based on results of the determination of the determination unit. | 12-13-2012 |