Abstract:
PURPOSE: A registered person ghost processing apparatus and method thereof are provided to protect reception information about a ghost registered person. CONSTITUTION: A ghost setup determining unit(105) is connected to call request or message receipt. The ghost setup determining unit determines whether to set up ghost of a telephone number of a caller. A reception information controlling unit(113) stores reception information to a ghost memory unit. A receive refusal determining unit(107) determines whether to refuse the reception of a call according to the telephone number.
Abstract:
PURPOSE: An efficient scrambling/descrambling method and system thereof are provided to remove time for shifting a linear feedback shift register and to perform scrambling/descrambling data streams in a processing time. CONSTITUTION: A data stream generating unit(310) generates data streams. A scrambling LFSR(Linear Feedback Shift Register) group(320) calculates sequence output about data streams. A scrambling processing unit(350) scrambles data screams by using the calculated sequence output. The data stream generating unit generates the data streams by using data to be scrambled by bit.
Abstract:
PURPOSE: A visual light wireless communication method and a device for the same are provided to minimize the brightness reduction of a visual light source or a light device which is generated by a code for a communication and a demodulation function. CONSTITUTION: A coding and modulating unit(120) code and modulates each bit of a code which will transmits the code by at least one between a first modulating signal and a second modulating signal. The first modulating signal is for enabling light during a unit time in continuous on state. A second modulating signal is for generating the off/on of light within the unit time or generating on/off modification. A visible light source driving unit(130) drives the light by using a first modulating signal or a second modulating signal. The visible light source driving unit performs visible light wireless communication through the light.
Abstract:
PURPOSE: A method and an apparatus for allocating a demodulation reference signal are provided to increase transmission efficiency by reducing the complexity of the channel estimation. CONSTITUTION: A demodulation reference signal is produced. The demodulation reference signal is allocated at successive subcarrier location for the entire transmission antenna of a user terminal. The demodulation reference signal is allocated in the different subcarrier location for each transmission antenna of the user terminal. The process of generating the demodulation reference signal comprises the step of circulating and changing the base sequence corresponding to the number of the subcarriers according to the transmission antenna. The process of allocating the demodulation reference signal comprises the step of successively allocating the demodulation reference signal to each transmission antenna one by one.
Abstract:
PURPOSE: An apparatus and a method for rapidly processing discrete Fourier transformation are provided to reduce a time for detecting random access signal by performing the discrete Fourier transformation using the fast Fourier transformation. CONSTITUTION: A zero padding unit receives first input signal with a pre-set length and converts the first input signal into second input signal with a length as much as the square of two. The second input signal is outputted. A fast Fourier transformer(22) performs a fast Fourier transformation with respect to the second input signal. A preamble index determining unit(23) detects an preamble index from the outputted signal from the fast Fourier transformer.
Abstract:
PURPOSE: A method and an apparatus for decoding a map, and a turbo-map decoder using the same are provided to easily process a desired data part for a decoding process by regulating the bit-width of operational data based on the modulating method of input data, when data, which is inputted in a turbo decoder from a demodulator, is decodes. CONSTITUTION: A first metric operational unit(401) calculates first metric data from input data. A first bit-width regulator(403), according to the modulating method of the input data, adjusts the bit-width of the data outputted from the first metric operational unit. A second metric operational unit calculates second metric data using the first metric data with the regulated bit-width. A log likelyhood ratio(LLR) operational unit(413) calculates LLR data using the second metric data. A second bit-width regulator(415) outputs a decoded data by reregulating the bit-width of the LLR data.
Abstract:
PURPOSE: A PDSCH transfer bit number calculating method and an apparatus thereof are provided to supply in order to accurately calculate several bit to a code word per PDSCH in advance. CONSTITUTION: A resource assigning unit(101) assigns the resource about a downlink data channel. A channel analyser(113) searches channel use conditions about the required resource in the resource assigning unit. The channel analyser grasps an usable resource. A sub-carrier analyzing unit(125) grasps the usable sub-carrier about the usable resource. A bit number calculating unit(131) produces a transfer bit number per a code word transferred to the downlink data channel.
Abstract:
PURPOSE: A fast fourier transform/inverse fast fourier transform apparatus and a method thereof are provided to improve a computing speed by performing a distributed calculation operation through a Cooley-Tukey algorithm. CONSTITUTION: A storage unit(200) includes a number of addresses which correspond to a number of data bits. A first Fourier transformer(110) successively stores half of the data in the storage unit. A second Fourier transformer(120) performs a second point of fast Fourier transformation/inverse fast Fourier transformation of the data, which has undergone a first point of fast Fourier transformation and has been stored. A third Fourier transformer(130) performs a third point of fast Fourier transformation/inverse fast Fourier transformation of the data, which has been transformed by the second Fourier transformer. An output unit(140) outputs the data stored in the storage based on an order using a Cooley-Tukey algorithm.
Abstract:
PURPOSE: A visible light wireless communication system by using multi carrier and a method thereof are provided to use multi carrier technique capable of higher order modulation, thereby overcoming the limit of the transmission speed on existing strength modulation method in a VLC(Visible Light Communications). CONSTITUTION: A modulator unit(110) performs the symbol-mapping of transmission data. The modulator unit modulates symbols into parallel data. The modulator unit performs IFFT(Inverse Fast Fourier Transform) of the modulated data. The modulator unit divides the IFFT result value into the real number data and imaginary number data. A DAC(Digital Analog Converter) unit(130) respectively converts the real number data and imaginary number data into analog signal. A transmitting unit(150) transmits the converted real number data and imaginary number data by the visible ray.
Abstract:
본 발명은 다중 안테나 시스템에서의 송신 심볼 검출 방법에 관한 것이다. 본 발명에서, 수신단은 채널 추정을 통해 채널 행렬이 추정되면, 추정된 채널 행렬을 포함하는 증대된 채널 행렬을 일반적인 QR 분해에 비해 단순화된 QR 분해 방식을 통해 Q 행렬과 R 행렬을 산출한다. 그리고, 두 행렬을 이용하여 최소 유클리디언 메트릭을 가지는 심볼들을 송신 심볼로 검출한다. 송신 심볼, SIC, 부최적 검출, 후보 벡터, QR 분해