| Patent application number | Description | Published |
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| 20100214067 | APPARATUS AND METHOD FOR LOCATING RFID TAG - Provided are a Radio Frequency Identification (RFID) tag and apparatus and method for locating a RFID tag without comparing arrival times of blink signals transmitted from the RFID tag in order to quickly trace a location of the RFID tag. The RFID tag includes a tag ID generator configured to generate a tag ID of the RFID tag, a blink generator configured to generate a plurality of sub-blink signals that form the blink signal, a sub-blink ID generator configured to generate sub-blink IDs for the generated sub-blink signals, a sub-blink ID inserter configured to insert the generated sub-blink IDs into the sub-blink signals, and a transmitter configured to transmit the blink signal having the tag ID and the sub-blink IDs. | 08-26-2010 |
| 20100253483 | FREIGHT CONTAINER CARGO-WORKING MANAGEMENT SYSTEM AND METHOD USING RFID TECHNOLOGY - A freight container cargo-working management system and method which can use Radio Frequency Identification (RFID) technology for displaying a cargo-working location of a container by recognizing an RFID tag adhered to a container vehicle passing through a warehouse entrance is provided. A freight container cargo-working management system including: an RFID tag to include freight information and be adhered to a container; an RFID reader to be installed at a warehouse entrance for recognizing the freight information included in the RFID tag; a cargo-working location information transmitter to be installed at the warehouse entrance for wirelessly transmitting cargo-working location information of the container corresponding to the freight information recognized by the RFID reader; and a cargo-working location display to be included in a vehicle with the container attached for displaying the cargo-working location information wirelessly transmitted from the cargo-working location information transmitter. | 10-07-2010 |
| 20100278289 | MULTISTAGE CHANNEL ESTIMATION METHOD AND APPARATUS - A multistage channel estimation method and apparatus is provided. The multistage channel estimation method includes: receiving a data frame to compensate for a distortion of the data frame based on a first channel estimation value associated with a corresponding section of the data frame; a first step of changing the corresponding section to calculate a second channel estimation value associated with the changed section; a second step of updating the first channel estimation value based on the calculated second channel estimation value; a third step of compensating for the distortion of the data frame based on the updated first channel estimation value to count a number of compensations; and repeating the first step through the third step, when the counted number of compensations does not match a predetermined numerical value. | 11-04-2010 |
| 20110095869 | METHOD AND APPARATUS FOR REAL TIME LOCATION TRACKING USING RFID - Proposed are a method and apparatus for real-time location tracking using Radio Frequency Identification (RFID), the apparatus including: a first reception information receiver to receive first reception information of a tag signal from a plurality of RFID readers that receives the tag signal from an RFID tag; a reader group generator to select, from the plurality of RFID readers, at least three RFID readers based on the first reception information and generate an RFID reader group including the selected at least three RFID readers; and a location calculator to calculate a location of the RFID tag based on first reception information that is received from the at least three RFID readers included in the RFID reader group. | 04-28-2011 |
| 20110110218 | APPARATUS AND METHOD FOR TRANSMITTING PACKET DATA IN WIRELESS SENSOR NETWORK - Provided is an apparatus and method for transmitting packet data in a WSN. The apparatus for transmitting packet data in a WSN includes: a serial-to-parallel converter to parallel-convert information and output the converted information to two channel paths; a Walsh code pair generation unit to select an arbitrary Walsh code pair, mix the selected Walsh code pair with a pseudo noise (PN) code, and output one Walsh code to one channel path and the other Walsh code to the other channel path; a first mixer to mix the signals inputted to two channel paths, and generate a spread symbol for each path; a delay to delay the other channel path signal by a predetermined time; and a transmission unit to convert one channel path signal and the other channel path signal delayed by the delay into transmission frequency band signals, and transmit the converted signals as wireless signals. | 05-12-2011 |
| 20110122926 | APPARATUS AND METHOD FOR GENERATING PSEUDO NOISE CODE - An apparatus and method of generating a pseudo noise (PN) code is provided. The apparatus for generating the PN code includes: a memory device unit including a plurality of memory devices; an exclusive-OR (XOR) operation unit receiving output values of at least two memory devices among output values of the plurality of memory devices to output an XOR operation value with respect to the received output values; and a PN code generation unit generating the PN code based on an output value of the XOR operation unit. | 05-26-2011 |
| 20110148708 | METHOD FOR ACCURACY IMPROVEMENT OF TIME MEASUREMENT AND POSITION TRACKING APPARATUS USING THE SAME - Disclosed is a method for improving accuracy of time measurement and a position tracking apparatus using the same. A method for improving accuracy of time measurement includes receiving a radio communication signal and obtaining timing information in a received signal; tracking a code that detects inconsistent timing between the received signal and a tracking signal generated for the received signal; storing history information on the inconsistent timing between the received signal and the tracking signal for each bit of the received signal; and arithmetically averaging the history information and updating the timing information of the received signal with the arithmetically averaged value. | 06-23-2011 |
| Patent application number | Description | Published |
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| 20100127831 | ACTIVE RFID APPARATUS FOR IMPROVING PN CODE GNENRATION - An active radio frequency identification (RFID) apparatus having an additional transmitter in addition to a single transmitter is provided. The active RFID apparatus includes a first transmitter including a first pseudo noise (PN) code generator to generate a direct sequence spread spectrum (DSSS) introduced by ISO/IEC (International Organization for Standardization/International Electrotechnical Commission) 24730-2 or ISO/IEC 18185-5 type B; and a second transmitter including a second PN code generator to perform an AND operation on an initial value and a fed back value and shift the resultant value of the AND operation, to perform an XOR operation on particular bits from among the shifted bits and to perform an XOR operation again on the shifted bits and the resulting value of the XOR operation to finally generate a PN code. Accordingly, where an additional PN code is added besides an existing PN code, a PN code having excellent auto correlation characteristics allowing discrimination of the PN code itself and cross-correlation characteristics providing a code discrimination ability with respect to another code can be generated. | 05-27-2010 |
| 20100127934 | POSITIONING SYSTEM, COMMUNICATION SIGNAL RECEIVER FOR POSITIONING SYSTEM, AND POSITION CALCULATION METHOD - A positioning system is provided which is capable of calculating the position of a target object even though it does not detect some synchronous signal necessary for position calculation. A communication signal receiver which provides information used in the position calculation is also provided. The positioning system includes a plurality of communication signal receivers each to detect a communication signal from a target object to be tracked and synchronous signals repeatedly transmitted for timing synchronization, and to acquire a receiving time interval between the synchronous signals, a receiving time interval between the synchronization signal and the communication signal, and synchronization signal identification information; and a position calculator to calculate a position of the target object by calculating a receiving time error of the communication signal from the receiving time interval between the synchronous signals, the receiving time interval between the synchronization signal and the communication signal, and the synchronization signal identification information. | 05-27-2010 |
| 20100158165 | PARALLEL AUTOMATIC FREQUENCY OFFSET ESTIMATION METHOD AND APPARATUS - Disclosed is a wireless signal receiving apparatus, and more particularly, disclosed is a parallel automatic frequency offset estimation apparatus and method for tracking a frequency offset in an early stage by calculating, in parallel, frequency offsets of a received signal. The parallel automatic frequency offset estimation apparatus includes a receiving unit to receive a data frame; and a frequency offset estimation unit to calculate, in parallel, frequency and phase deviations at different bit intervals within a particular section of the received data frame, to add together the frequency and phase deviations to obtain a first sum of the frequency and phase deviations, and to add the first sum to a frequency phase deviation calculated for each bit after the particular section in the received data frame to obtain a second sum of the frequency and phase deviations. Accordingly, transmission frequency tracking can be performed at higher speed, compared to the conventional systems in which frequency offset acquisition is carried out in stages. Also, accurate tracking of a transmission frequency is possible in an initial frame. | 06-24-2010 |
