Patent application number | Description | Published |
20100158088 | PORTABLE APPARATUS AND METHOD OF MEASURING WIRELESS CHANNEL AND MULTIPLE ANTENNA CORRELATION - A portable apparatus of measuring a wireless channel and a multiple antenna correlation, the apparatus including: a Radio Frequency (RF) unit to control a frequency of a signal to be measured, to broadcast the signal to be measured through multiple transmission antennas, to control a frequency of a received signal, and to send the received signal to the baseband unit, the received signal being received through multiple receiving antennas; and a baseband unit to generate and transmit, to the RF unit, the signal to be measured, to measure wireless channels for each of the multiple transmission antennas and wireless channels for each of the multiple receiving antennas based on the received signal output from the RF unit, to calculate a correlation for each of the multiple transmission antennas, and to calculate a correlation for each of the multiple receiving antennas based on the wireless channels for each of the multiple transmission and receiving antennas. | 06-24-2010 |
20100159854 | METHOD AND APPARATUS FOR ADAPTIVELY CONTROLLING RECEIVED POWER OF MULTI-ANTENNA RADIO CHANNEL MEASUREMENT EQUIPMENT - Provided is an apparatus for adaptively controlling a received power of a multi-antenna radio channel measurement equipment, the apparatus including: a plurality of antennas to receive a measurement signal; a switch unit comprising a plurality of switches to input the measurement signal; a switch control unit to control the plurality of switches of the switch unit to sequentially input the measurement signal; a reception (Rx) attenuator to adjust a Received Signal Strength Indication (RSSI) of the measurement signal; an Rx AGC control unit to control the Rx attenuator to adaptively adjust the RSSI of the measurement signal; a timing control unit to generate a reference timing signal for the switch control unit and the automatic RSSI control unit; and a digital baseband control unit to collect and store information associated with the measurement signal. | 06-24-2010 |
20100217763 | METHOD FOR AUTOMATIC CLUSTERING AND METHOD AND APPARATUS FOR MULTIPATH CLUSTERING IN WIRELESS COMMUNICATION USING THE SAME - An automatic clustering method using an Average-linkage algorithm and a KPower Means algorithm, and a method and apparatus for multi-path clustering required for a spatial channel modeling (SCM) in a wireless communication environment are provided. The automatic clustering method, including: a first step of obtaining an initial cluster centroid using a hierarchical clustering algorithm; a second step of moving the initial cluster centroid using a two dimensional clustering algorithm; a third step of clustering a data set according to the moved initial cluster centroid; and a fourth step of calculating a validation index with respect to the clustered data set and determining an optimal number of clusters. | 08-26-2010 |
20100260078 | MULTI-ANTENNA RADIO CHANNEL MEASUREMENT SYSTEM AND METHOD WHICH GENERATES TIME DIVISION DUPLEX TIMING SIGNAL AND MEASURES TWO-WAY RADIO CHANNEL - The present invention relates to a multi-antenna radio channel measurement system and method which generates a Time Division Duplex (TDD) timing signal and measures a two-way radio channel. The multi-antenna radio channel measurement system which measures a probing signal for measuring a radio channel, the multi-antenna radio channel measurement system including: a baseband unit alternately transmits the probing signal for measurement and receives the received channel signal to be measured based on a TDD synchronization time; a synchronization unit which obtains time synchronization with the other radio channel measurement system, generates a transmission/reception synchronization signal, and provides the transmission/reception synchronization signal to the baseband unit; a transceiver unit which up converts the probing signal for measurement and down converts the received channel signal; and a radio frequency (RF) front-end unit which switches suitable antennas according to a timing control signal of the baseband unit. | 10-14-2010 |
20100271953 | MULTI-ANTENNA RADIO CHANNEL MEASUREMENT SYSTEM AND METHOD FOR TWO-WAY RADIO CHANNEL MEASUREMENT - The present invention relates to a multi-antenna radio channel measurement system and method for a two-way radio channel measurement, including: Control & Console Software to select a radio measurement mode, generate a probing signal for measurement, receive input parameters to be measured, and deliver the parameters to a baseband unit; a baseband unit (BBU) to set a transmission/reception frequency band and bandwidth and set a timing using the selected radio measurement mode and the received input parameters; a timing unit to synchronize a time with another radio channel measurement system to generate a transmission/reception synchronization signal, and provide the transmission/reception synchronization signal to the BBU; a transceiver unit (TRXU) to up-convert the probing signal for measurement and down-convert the reception channel signal; and a radio frequency (RF) front-end unit (RFFU) to switch to a suitable antenna according to a timing control signal of the BBU. | 10-28-2010 |
20120020432 | METHOD FOR ESTIMATING MIMO CHANNEL USING LOOSELY SYNCHRONOUS CODES, AND APPARATUS USING THE SAME - Disclosed are a method and apparatus for estimating a Multiple Input Multiple. Output (MIMO) channel. A signal transmission method for estimating the MIMO channel via 2N transmission antennas (N is greater than or equal to “1”) includes generating a code having a predetermined Interference Free Window (IFW), and transmitting the code via two transmission antennas. | 01-26-2012 |
20120155516 | MULTI-LINK WIRELESS CHANNEL SOUNDER AND MULTI-LINK WIRELESS CHANNEL MEASUREMENT METHOD THEREOF - A multi-link wireless channel sounder is provided. The multi-link wireless channel sounder includes a multi-input multi-output (MIMO) antenna unit, a transmitter (TX) signal processing unit configured to transmit via the MIMO antennas one or more TX wireless channel signals to be transmitted via a wireless channel, a receiver (RX) signal processing unit configured to receive and process one or more RX wireless channel signals that are received from multiple links via the MIMO antenna unit, and a control unit configured to receive an operation mode selection signal that indicates a TX mode or an RX mode from a user and to control the TX signal processing unit or the RX signal processing unit to operate selectively in accordance with the operation mode selection signal. | 06-21-2012 |
20130163488 | RADIO-FREQUENCY TRANSCEIVING FRONT-END APPARATUS USING PASSIVE ELEMENTS IN WIRELESS COMMUNICATION SYSTEM - Disclosed is a radio-frequency front-end apparatus that can be used in wireless communication systems performing transmission/reception by using a single antenna. The radio-frequency transceiving front-end apparatus using passive elements in a wireless communication system includes: a transmitting unit's hybrid coupler configured to divide and output a transmission signal into two outputs having a phase difference of 90°; a first circulator configured to receive a first output of the hybrid coupler through a first terminal thereof and output the received first output through a second terminal thereof; a second circulator configured to receive a second output of the hybrid coupler through a first terminal thereof and output the received second output through a second terminal thereof; and an output unit's hybrid coupler configured to receive transmission signals from the second terminal of the first circulator and the second terminal of the second circulator, and combine and output the received signals. | 06-27-2013 |