| Patent application number | Description | Published |
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| 20090052593 | LOG LIKELIHOOD RATIO CALCULATION METHOD, TRANSMIT SIGNAL DETECTION METHOD, AND RECEIVER - The present invention relates to a log-likelihood ratio calculation method, a transmitting signal detection method, and a receiver. The present invention estimates a channel on the basis of the received signal and rearranges a plurality of layers. Further, at the time of rearrangement of the layers, a symbol of a layer having the lowest reliability is considered for every constellation dot, and the successive interference for the remaining layers is removed corresponding to the constellation dots of the layer having the lowest reliability to set the transmitting symbol candidate vector. Furthermore, a log-likelihood ratio for every bit of the plurality of layers is calculated using the transmitting symbol candidate vector to decode the channel. | 02-26-2009 |
| 20090060069 | SIGNAL TRANSMITTING APPARATUS, METHOD THEREOF, AND INVERSE FAST FOURIER TRANSFORM APPARATUS FOR SIGNAL TRANSMITTING APPARATUS - The present invention relates to a signal transmitting apparatus, a method thereof, and an inverse fast Fourier transform (IFFT) apparatus for a signal transmitting apparatus. A signal transmitting apparatus according to an embodiment of the present invention receives data, and performs inverse fast Fourier transform (IFFT) on the data on the basis of a twiddle factor for shifting output data by the size of a cyclic prefix. In addition, the signal transmitting apparatus sequentially stores data corresponding to the size of the cyclic prefix starting with initial data among the transformed data, and generates an OFDM symbol on the basis of the stored data and the transformed data. According to the embodiment of the present invention, it is possible to efficiently reduce a time delay and a memory use amount when a cyclic prefix is added at a transmitting end, without changing the size of hardware and power consumption. | 03-05-2009 |
| 20090135964 | METHOD OF CALCULATING LOG-LIKELIHOOD RATIO AND METHOD OF DETECTING TRANSMISSION SIGNAL - The present invention relates to a method of calculating a log-likelihood ratio and a method of detecting a transmission signal. According to the present invention, when a transmission symbol candidate vector is detected on the basis of a received signal, a threshold value and an ML metric of each transmission symbol candidate vector are calculated and the ML metric that is larger than the threshold value is updated by the threshold value. Further, a log-likelihood ratio of the transmission signal bit is calculated using the updated ML metric and the threshold value, and a transmission signal is detected using the log-likelihood ratio. | 05-28-2009 |
| 20090147894 | METHOD FOR DETECTING TRANSMISSION SYMBOLS IN MULTIPLE ANTENNA SYSTEM - The present invention relates to a transmission symbol detection method in a multiple antenna system. In the present invention, when a channel matrix is estimated through channel estimation, a receiving side calculates a Q matrix and an R matrix through QR decomposition that is more simplified than a typical QR decomposition from an augmented channel matrix that includes the estimated channel matrix. In addition, the receiving side detects symbols having the minimum Euclidean metric by using the two matrixes, as transmission symbols. | 06-11-2009 |
| 20100130187 | BASE-STATION CONFIGURATION CONTROL SYSTEM AND METHOD - Provided are a base-station configuration control apparatus, system and method. The base-station configuration control apparatus includes a user interface and a CPU. The user interface receives a user's request to selection of a standard protocol. The CPU receives one or more programs based on a selected standard protocol from a storage, which is connected to an external bus, to download the received programs to a function block through a host interface, based on a SDR technology. | 05-27-2010 |
| 20100131628 | MOBILE BASE STATION AND HARDWARE PLATFORM RECONFIGURING METHOD FOR THE SAME - Provided is a hardware platform reconfiguring method for a mobile base station. A control signal for controlling the download of a program is generated based on an SDR technique. A program is received from an external device. The program from the external device is downloaded to a hardware module of the mobile base station based on the SDR technique according to the control signal. | 05-27-2010 |
| 20100149963 | APPARATUS AND METHOD FOR FAST FOURIER TRANSFORM/INVERSE FAST FOURIER TRANSFORM - An FFT/IFFT apparatus and method are provided. The FFT/IFFT apparatus includes a storage unit, a first FFT/IFFT unit, a second FFT/IFFT unit, and a third FFT/IFFT unit. The storage unit has as many addresses as the number of bits of input data. The first FFT/IFFT unit sequentially stores half of the input data in the storage unit, performs a first-point FFT/IFFT operation while sequentially receiving the other half of the input data, and stores the first-point FFT/IFFT operation result in the storage unit. The second FFT/IFFT unit performs a second-point FFT/IFFT operation on the first-point FFT/IFFTed data, and stores the second-point FFT/IFFT operation result in the storage unit. The third FFT/IFFT unit performs a third-point FFT/IFFT operation on the second-point FFT/IFFTed data, and stores the third-point FFT/IFFT operation result in the storage unit. | 06-17-2010 |
| 20100150277 | METHOD FOR DETECTING RANDOM ACCESS SIGNAL - Provided is a method for detecting random access signal, and the method includes detecting a peak position of a random access signal in a first preamble section and ignoring the random access signal apart from the peak position for less than a certain distance in a second preamble section adjacent to the first preamble section. | 06-17-2010 |
| 20100153826 | APPARATUS AND METHOD FOR TAIL BITING CONVOLUTIONAL ENCODING - Provided are an apparatus and a method for tail biting convolutional encoding. The apparatus includes a plurality of shift registers and at least one operator. The plurality of shift registers sequentially performs a shift operation on input bit-stream. The operator outputs an encoded bit-stream by performing convolutional encoding on an output of the shift register using a generator polynomial corresponding to a predetermined code rate. A transmission encoded bit-stream is created by replacing encoded data for a certain initial bit-stream of the encoded bit-stream with a bit-stream obtained by subsequently performing convolutional encoding on the initial bit-stream. | 06-17-2010 |
| 20100157917 | RESOURCE ALLOCATION MAPPING APPARATUS AND METHOD FOR TRANSMITTING CSRS, AND CSRS TRANSMITTING APPARATUS AND METHOD - Provided are a resource allocation mapping apparatus and method for transmitting CSRS, the resource allocation mapping method includes calculating subcarrier indexes to allocate same subcarrier index to base stations that have same remainder when a base-station index, which classifies the base stations, is divided by a constant; and mapping a resource allocation of the CSRS for the each base station using the calculated subcarrier indexes. | 06-24-2010 |
| 20100157918 | METHOD AND APPARATUS FOR ALLOCATING DEMODULATION REFERENCE SIGNALS - Provided are a method and apparatus for allocating DeModulation Reference Signals (DMRSs). The method includes generating DMRSs, and allocating the DMRSs at consecutive subcarrier positions with respect to all the transmit (TX) antennas of each User Equipment (UE) and allocating the DMRSs at different subcarrier positions with respect to each TX antenna of the UE. | 06-24-2010 |
| 20100158145 | MULTIPLE INPUT MULTIPLE OUTPUT RADIO COMMUNICATION SYSTEM WITH PRE-EQUALIZER AND COMMUNICATION METHOD THEREOF - Multiple Input Multiple Output (MIMO) radio communication system and method are provided. A transmitter of the MIMO radio communication system includes an STBC encoding unit, a pre-equalization unit, and a transmit antenna unit. The STBC encoding unit receives a transmit data and performs an STBC encoding to output a plurality of encoded signals. The pre-equalization unit performs a pre-equalization process on the plurality of encoded signals to output a plurality of transmit signals. The transmit antenna unit transmits the plurality of transmit signals at different time. Also, a receiver of the MIMO radio communication system which includes a receive antenna unit, an STBC decoding unit, and a data output unit is provided. | 06-24-2010 |
| 20100159939 | BIT CALCULATION METHOD AND APPARATUS FOR PDSCH TRANSMISSION - Provided is a bit calculation method, which accurately and easily calculates how many bits are transmitted by codeword per PDSCH in advance before a modulator performs modulation by TTI unit on a PCH or a DL-SCH transferred by a TrCH encoder, in a base-station modulator applied to an LTE-advanced system. Accordingly, the bit calculation method enables smooth data transmission, and easily checks data transmission error. | 06-24-2010 |
| 20100161699 | HIGH-SPEED DISCRETE FOURIER TRANSFORM APPARATUS AND METHOD THEREOF - Provided are a high-speed Discrete Fourier Transform (DFT) apparatus and a method thereof. The high-speed DFT apparatus includes a zero padding unit, a Fast Fourier Transform (FFT) unit, and a preamble index decision unit. The zero padding unit receives a first input signal having a length of a prime number and changes the first input signal into a second input signal having a length of an exponentiation of 2. The FFT unit performs a FFT on the second input signal outputted from the zero padding unit. The preamble index decision unit detects a preamble index from an output signal from the FFT unit. | 06-24-2010 |
| 20100162077 | METHOD AND APPARATUS FOR MAP DECODING AND TURBO DECODER USING THE SAME - A Maximum A Posteriori (MAP) decoder and a MAP decoding method are provided. The MAP decoder includes a first metric operation unit, a first bit-width control unit, a second metric operation unit, a Log Likelihood Ratio (LLR) operation unit, and a second bit-width control unit. The first metric operation unit outputs a first metric data using an input data. The first bit-width control unit controls a bit-width of the first metric data according to a modulation scheme of the input data. The second metric operation unit outputs a second metric data using the first metric data having the controlled bit-width. The LLR operation unit outputs LLR data using the second metric data. The second bit-width control unit outputs decoding data by re-controlling the bit-width of the LLR data. | 06-24-2010 |
| 20100266094 | DUAL-COOLED NUCLEAR FUEL ROD HAVING ANNULAR PLUGS AND METHOD OF MANUFACTURING THE SAME - A dual-cooled nuclear fuel rod and a method of manufacturing the same are provided. The nuclear fuel rod includes an outer cladding tube having a circular cross section, an inner cladding tube having an outer diameter smaller than an inner diameter of the outer cladding tube, and a length longer than the outer cladding tube, and located in parallel in the outer cladding tube, a pellet charged in a space between the outer and inner cladding tubes and generating energy by nuclear fission, and first and second end plugs coupling opposite ends of the outer cladding tube to stepped outer joints formed on outer circumferences of first ends thereof and coupling opposite ends of the inner cladding tube to stepped inner joints formed on inner circumferences of the first ends thereof. | 10-21-2010 |
| 20110026918 | APPARATUS FOR VISIBLE LIGHT COMMUNICATION INDICATING COMMUNICATION QUALITY USING RGB COLOR MIXING AND METHOD THEREOF - A visible light communication apparatus of the present invention includes: a target signal receiver filtering only a signal having a target wavelength from a visible light received signal received from a transmitting terminal; a signal generator judging a reception quality of the visible light received signal by using characteristics of the signal having the target wavelength and generating a visible signal by using at least one light source having a wavelength different from the target wavelength in accordance with the reception quality; and an optical signal transmitter transmitting the signal having the target wavelength for transmitting data together with the visible signal and changing a light emitting color of a visible light transmitted signal. | 02-03-2011 |
| 20110033181 | APPARATUS FOR VISIBLE LIGHT COMMUNICATION PROVIDING INTUITIVE INFORMATION AND METHOD USING THE SAME - There is disclosed a visible light communication technology capable of intuitively recognizing a transmission speed, an alignment state, a communication state, or a transmission rate. A visible light communication apparatus according to an embodiment of the present invention includes: a light source selecting unit selecting at least one light source from among a plurality of light sources generating lights having different wavelengths by considering intuitive information distinguished depending on a wavelength in a visible light band; and a visible light communication unit performing visible light communication by at least one selected light source to allow the intuitive information to be recognized by a color corresponding to at least one selected light source. Accordingly, a user using the visible light communication can intuitively know an optimal communication state or transmission speed. | 02-10-2011 |
| 20110069965 | TRANSMITTER, RECEIVER FOR VISIBLE LIGHT COMMUNICATION AND METHOD USING THE SAME - A visible light wireless communication receiver includes: a source code recognizing unit that receives a source bit stream and recognizes the source bit stream as source codes of a unit of a first number of bits; and a line coding unit that encodes each of the source codes into an encoding code of a unit of a second number of bits, the second number being larger than the first number. In particular, in the encoding code, the number of bits corresponding to 1 is the same as the number of bits corresponding to 0. Therefore, the change in brightness of lighting may be minimized in the visible light wireless communication. | 03-24-2011 |
| 20110103521 | METHOD AND APPARATUS FOR DECOMPOSING RECEIVED SYMBOL SIGNAL MODULATED WITH BIT REFLECTED GRAY CODE IN BIT INFORMATION - Disclosed is a method and apparatus for composing a received symbol signal modulated with a bit reflected Gray code into bit information. According to an embodiment of the present invention, a positive integer of the received symbol signal having bits is assigned according to the Gray mapping rule, and a sign is determined. A value that is indicative of an arrangement of the bits constituting the received symbol signal is calculated. A boundary value in at least one bit group consisting of the bits constituting the received symbol signal is acquired, and a difference from an absolute value of the received symbol signal is calculated. The received symbol signal is converted into information per bit using a value of the received symbol signal based on the positive integer and the determined sign, the value that is indicative of the bit arrangement, and the difference from the absolute value. Therefore, it is possible to reduce complexity in bitwise decomposition for an iterative decoder inevitably used in a receiver. | 05-05-2011 |
| 20110145905 | APPARATUS AND METHOD FOR MANAGING WEB BASED SERVICE ACCOUNT - Provided is a method and apparatus for managing a web based service account. The web based service account management apparatus may select, from among web based service accounts, an account undesired to be exposed to others, and may display an account set with a hiding indication only when a user authenticated through a user authentication process desires to read the account. | 06-16-2011 |
