Abstract:
A crowd video display control apparatus divides content into a plurality of partial content according to the number of mobile display devices on which the content is to be displayed, and respectively transmits the partial content to the mobile display devices according to location information on the mobile display devices on which the content is to be displayed.
Abstract:
Disclosed is a method for measuring and correcting delay time between a digital unit and multiple radio units. The method for measuring and correcting the delay time according to one embodiment of the present invention measures the delay time between the digital unit and the radio units and corrects the delay time. Thereby, a capacity is increased and performance is improved by equalizing time synchronization between the radio units for cooperative communication. [Reference numerals] (400) Measure delay time by using a clock counter corresponding to each RU; (410) Select a clock counter value with the maximum delay time as reference delay time value by comparing the clock counter values of each RU; (420) Calculate relative delay time value of each RU; (430) Store a data value to be transmitted to each RU from DU in proportion to the relative delay time and transmit the data value; (AA) Start; (BB) End
Abstract:
다중 입출력 통신 시스템의 신호 검출 방법 및 그 장치는, 복수의 송신 안테나를 통하여 전송되는 신호들을 복수의 수신 안테나를 이용하여 수신하는 다중 입출력 통신 시스템에서, 수신 신호로부터 검출하고자 하는 심볼의 위치를 결정하는 행렬을 첫 번째 심볼 검출 단계에서만 산출한다. 그리고 이후 단계부터는 이전 단계에서 산출된 행렬로부터 간단한 연관 관계를 통하여 현 단계에서의 행렬을 획득하여 검출하고자 하는 심볼의 위치를 결정한다. MIMO, MMSE, MMSE-SIC, 심볼검출
Abstract:
본 발명은 신호 검출 방법 및 수신 장치에 관한 것이다. 본 발명에 따른 신호 검출 방법은 다중 입출력 안테나를 포함하는 통신 시스템의 수신 장치가 신호를 검출하는 방법으로서, 수신 신호 벡터와 채널 상태가 고려된 송신 심볼 벡터 사이의 거리의 제곱 값을 구하는 단계, 상기 거리의 제곱 값을 제1 성분 및 제2 성분으로 분류하는 단계, 상기 제1 성분을 최소화 하여 복수의 제1 연성해(soft symbol estimate)를 구하는 단계, 상기 복수의 제1 연성해를 기초로 상기 제1 성분의 해집합을 구하는 단계, 상기 제2 성분을 최소화 하여 복수의 제2 연성해를 구하는 단계, 상기 복수의 제2 연성해를 기초로 상기 제2 성분의 해집합을 구하는 단계, 그리고 상기 제1 성분의 해집합과 상기 제2 성분의 해집합을 합하여 최종 해집합을 구하는 단계를 포함한다. 디텍션, 디코딩, MIMO, likelihood
Abstract:
PURPOSE: A method for demodulating a downstream link signal in a wireless communication system and a device thereof are provided to efficiently use wireless resources by controlling a length of a CP through proper scheduling. CONSTITUTION: A first OFDM(Orthogonal Frequency Division Multiplexing) signal is received from a first node servicing a terminal. A second OFDM signal is received from a second node. The first and the second OFDM signals are demodulated in an FFT(Fast Fourier Transform) section. The first and the second OFDM signals are a normal mode signal having a first CP(701) or a cooperative mode having a second CP(702). A length of the second CP is longer than a length of the first CP. [Reference numerals] (701) Short CP; (702) Long CP; (703) Normal mode demodulation; (704) Cooperative mode demodulation; (705) Relay delay; (AA) First OFDM signal; (BB) Second OFDM signal
Abstract:
PURPOSE: A method for estimating a signal to noise ratio in a wireless communication system and an apparatus thereof are provided to improve a SNR(Signal To Noise Ratio) estimated performance by increasing a SNR ratio. CONSTITUTION: A sector preamble selecting unit(301) selects each sector preamble signal of a plurality of sectors for a received signal passing through FFT(Fast Fourier Transform) outputting. A correlator(302) outputs a correlation signal by performing the correlation of a preamble reference signal and a sector preamble signal. A signal power estimation part(203) estimates received signal power for each sector based on the correlation signal. Noise power estimation parts(301-303) estimates noise power for each sector based on the correlation signal. A minimum value selection part(304) selects a minimum value of the noise power for each sector. An adder(205) outputs pure power for each sector by subtracting the selected minimum value from the received signal power for each sector. A divider(206) calculates a signal to noise ratio. [Reference numerals] (203) Signal power estimation part; (303) Sector 2, a noise power estimation part; (304) Minimum value selection part; (AA) Sector preamble selection part; (BB) Correlator; (CC) Sector 0, a noise power estimation part; (DD) Sector 1, a noise power estimation part
Abstract:
Disclosed are a method for re-ordering multiple layers and detecting signals and a receiver using the same to be able to exert performance approaching a maximum likelihood scheme while having lower complexity than that of the maximum likelihood scheme in a multiple input multiple output (MIMO) antenna system in a form where each layer is modulated and transmitted with different modulation orders.
Abstract:
PURPOSE: A transmission method for reducing packet transmission time is provided to prevent packet loss of an inter-SFN(Single Frequency Network) handover and to reduce packet transmission time. CONSTITUTION: A mobile broadcasting system uses the number of total packets of burst for the transmission of a broadcasting signal and the number of SFN(Single Frequency Network)s. The mobile broadcasting system determines a duplicate packet for the transmission of a broadcasting signal which is transmitted from single frequency network. The mobile broadcasting system transmits the burst of the broadcasting signal and the burst of single frequency network cell.
Abstract:
PURPOSE: A method for increasing an LLR(Log Likelihood Ratio) reliability based on a MIMO(Multi Input Multi Output) MMSE(Minimum Mean Square Error) receiver is provided to determine the LLR of a vector which does not satisfy the reciprocity as 0. CONSTITUTION: If an SINR(Signal and Interference and Noise Ratio) information about each existing stream is not available, the SINR is the same about the each stream, the LLR of an MMSE symbols which do not satisfy a reciprocity is determined as 0(204). Therefore, it is prevented that the LLR value of the high error probability is used for the channel encoding. If the SINR information of each stream is available, or the SINR of each stream is not same, the removed a priori item is calculated using the reciprocity information.
Abstract:
본 발명은 자원 할당 정보 전송 방법 및 그 장치에 관한 것이다. 자원 할당 정보를 전송하는 장치는 고정 할당 영역에 신규 단말에 대한 무선자원을 고정할당 하는 경우, 무선 자원을 할당하는 자원 할당 방식을 판별하고, 자원 할당 방식에 따라 할당이 이루어진 자원의 할당 형태를 판별하여, 판별된 자원 할당 방식 및 자원의 할당 형태를 토대로 할당된 자원에 대한 할당 정보를 복수의 정보 표시 방식 중 하나의 정보 표시 방식을 선택한다. 다음, 선택된 표시 방식을 토대로 상기 자원 할당 정보를 구성하여 자원 할당 정보를 전송 한다. 이로써, 본 발명은 패킷 통신방식의 이동통신 시스템에서는 고정할당 방식으로 데이터를 전송하여, 하향링크 맵의 크기를 최소로 할 수 있다. Fixed Allocation, Circuit mode