Abstract:
An indoor location system and method thereof are provided to estimate the delay time of the exact transmission signal by effectively separating the overlapped multi-path signals of the indoor channel. The indoor positioning system(100) comprises the transmitting node(200) and receiving node(300). The transmitting node produces the transmission packet including a plurality of same symbols. The transmitting node comprises the symbol generating unit(210), and the packet generator(220) and wireless communications unit(260). The distance between the receiving node and the transmitting node are measured based on the transfer time of the transmission packet from the transmitting node to the receiving node. The packet generator produces the transmission packet. The receiving node receives the transmission packet transmitted from the transmitting node.
Abstract:
A maximum likelihood detection apparatus and a method of a multiple input multiple output antenna performing the performance of near-ML are provided to detect near-ML(Maximum Likelihood) of a multiple input multiple output in a D-STTD(Double Space-Time Transmit Diversity) system. A transmission unit(100) includes a modulator(110) modulating the transmission signal. An encoding unit(120) divides the 4 transmission signal of the modulator into two groups. Two space-time block codes are produced. A transmission antenna(130) wirelessly transmits the transmission signal received from the encoding unit through two time slots. A receiver(200) comprises an RX-antenna(210) which wirelessly receives the transmission signal from the transmission unit through two time slots. An adder(220) adds the received signal and the white Gaussian noise received from the RX-antenna. A channel estimator(230) estimates the channel information for the detection of the normal reception signal which is not distortion error.
Abstract:
A method for precoding based lattice reduction using list quantizer in multiple antenna system and apparatus thereof are provided to obtain maximum performance like function of a sphere coder algorithm of low-complexity by analyzing quantum error pattern. A method for precoding based lattice reduction using list quantizer in multiple antenna system comprises the following steps: a step for inputting a symbol stream data for transmitting to a plurality of terminals; a step for coping an inputted symbol data as one or more identical stream data; a step for generating transmission signals mapped to a quantized signal made by a quantizing error pattern from an identical symbol stream data; and a step for selecting the smallest power value from among transmission signals.
Abstract:
본 발명의 실시예는 협력 인지 무선 통신망에서 순서 통계량을 이용하여 총 전송량을 늘리는 방법과 그 시스템에 관한 것이다. 협력 인지 무선 통신망에서 총 전송량 증가 방법에 있어서, 협력 인지 무선 통신망에서 요구하는 기준 오경보 확률과 기준 검파 확률을 확인하는 단계; 및 기준 오경보 확률과 기준 검파 확률을 만족하는 최소 인지 라디오 개수를 계산하는 단계를 포함하는 협력 인지 무선 통신망의 총 전송량 증가 방법이 제공될 수 있다.
Abstract:
An embodiment of the present invention relates to an optimal physical layer secure transmission method between cooperative devices and a base station for strengthening the secret information security of a user which communicates with the base station by using a physical layer signal processing technique in a downlink cellular communications network. The present invention relates to an optimal cooperation transmission method of a cooperative node and the base station having a multiple antenna in a communications network including the base station and mobile terminals. The present invention can provide the optimal cooperation transmission method which includes: a step of generating a signal of the base station to maximize the security transmission of a reception terminal intended by the base station; and a step of generating an optimal jamming signal of the cooperative node.
Abstract:
노드 장치는 신호에 대한 전파방해(jamming) 신호를 생성하되, 신호는 기지국으로부터 신호의 수신이 의도된(intended) 수신 장치와 신호의 수신이 비 의도된(unintended) 수신 장치로 전송되는 것인, 전파방해 신호 생성부, 의도된 수신 장치에서의 전파방해 신호의 수신 전력 크기를 고려하여 전파방해 신호의 빔포밍 벡터를 결정하는 빔포밍 벡터 결정부, 결정된 빔포밍 벡터에 기초하여 전파방해 신호를 전송하는 전송부를 포함한다.
Abstract:
본 발명은 직교주파수 분할 다중화(Orthogonal Frequency Division Multiplexing, OFDM) 방식의 통신 시스템에서 채널 추정을 위한 최적 크기의 임펄스 심볼(impulse symbol)을 포함하는 데이터 송신 방법에 관한 것으로서, 더욱 상세하게는 OFDM 시스템에서 채널 추정을 위하여, 시간축상의 데이터 심볼(data symbol)들 사이의 보호구간(guard interval)에 임펄스 심볼(impulse symbol)을 삽입하는 방법(Impulse Postfix, IP)을 적용함에 있어, 최적의 채널 추정 및 비트 오율(Bit Error Rate, BER) 성능을 유지하는 임펄스 심볼(impulse symbol) 크기를 결정하여 데이터 심볼(symbol)들 사이에 삽입하여 데이터를 송신하는 방법에 관한 것이다. 본 발명에 의하면, OFDM 시스템의 데이터 송수신에 있어서 적정 수준의 PAPR(Peak to Average Power Ratio)를 만족하면서 기존 채널 추정 기법들에 비해 향상된 비트 오율(Bit Error Rate, BER) 성능을 유지할 수 있다. 임펄스 포스트픽스(Impulse Postfix, IP), 임펄스 크기, OFDM
Abstract:
A node apparatus includes: a jamming signal generation unit for generating a jamming signal to a signal which is transmitted to a receiver intended to receive the signal from a base station and a receiver unintended to receive the signal; a beamforming vector determination unit for determining a beamforming vector of the jamming signal in regards to the magnitude of receiving power of the jamming signal in the intended receiver; and a transmission unit for transmitting the jamming signal on the basis of the determined beamforming vector. [Reference numerals] (101) Jamming signal generation unit; (102) Beamforming vector determination unit; (103) Transmission unit; (104) Database; (105) Receiver selection unit