Abstract:
무선 통신 시스템에서 단말 간 디스커버리 방법이 개시된다. 단말은 물리계층 상향링크 채널 또는 신호를 위한 제1 서브프레임과 디스커버리 신호를 위한 제2 서브프레임이 서로 동일한지 여부를 판단한다. 여기서, 단말은 제1 서브프레임과 제2 서브프레임이 서로 동일한 경우, 동일한 서브프레임에서, 디스커버리를 신호를 송신 또는 수신하지 않고 물리계층 상향링크 채널 또는 신호를 송신한다.
Abstract:
Disclosed are a method and apparatus for direct communication between terminals. The method for direct communication between terminals includes the steps of: setting a plurality of wireless resources which are dispersedly located on a frequency axis; and transmitting data to a second terminal by using the wireless resources. Therefore, interference due to cellular communication is reduced.
Abstract:
PURPOSE: A resource allocation method in a wireless communication system is provided to reduce interference between users by allocating a slot having the highest performance index among unoccupied slots in an OFDMA(Orthogonal Frequency Division Multiple Access) type ad-hoc system to a terminal. CONSTITUTION: A resource allocating device senses a subcarrier already being used by the other terminal among all of subcarriers(S410). The resource allocating device obtains a time error, a frequency error, and receiving power information of the occupied subcarrier(S420). The resource allocating device calculates an SINR(Signal-to-Interference plus Noise Ratio) of unoccupied subcarriers(S430). The resource allocating device allocates a subcarrier having the highest SINR among the unoccupied subcarriers to a terminal(S440). [Reference numerals] (S410) Sensing a subcarrier being used; (S420) Acquiring a time error, a frequency error, and receiving power information of the occupied subcarrier; (S430) Calculating SINR of unoccupied subcarriers; (S440) Selecting and allocating a subcarrier with the maximum SINR
Abstract:
PURPOSE: A device and a method for transmitting multi antenna system are provided to control a power assigned to a user data in use of BTHP(Block Tomlinson-Harashima Precoder) and ML(Maximum Likelihood) receiving method in a MIMO(Multi Input Multi Output), thereby improving the average error function of a system. CONSTITUTION: A linear encoder(120) outputs transmission data by user through non-linear type of linear encoder. A power allocation control unit(130) assigns power data by user and data of the linear encoder. A channel dividing filter(140) respectively multiplies a filter value to the data by a user. The power allocation control unit respectively assigns calculates power allocation variable to the data by a user.
Abstract:
PURPOSE: A method for generating bean forming vector considering adjacent cell interference is provided. CONSTITUTION: A method for generating bean forming vector comprises: a step of receiving information of first and second precoding matrixes from a serving base station(200); and a step of generating the beam forming vactor by linearly binding the first and second precoding matrixes. The first precoding matrix is a precoding matrix which maximizes transfer power from a terminal to serving base station. The second precoding matrix is a precoding matrix which minimizes interference power from the terminal to adjacent base station.
Abstract:
본 발명은 무선 통신 시스템에서 OFDM(Orthogonal Frequency Division Multiplexing) 임펄스(Impulse)를 활용하여 송신 안테나 별 채널을 추정하도록 한 무선 통신 시스템의 채널 추정 및 피드백 방법에 관한 것이다. 본 발명은 무선 통신 시스템에서 채널을 추정하는 방법에 있어서, 기지국은 송신 안테나 별로 특정 파형의 훈련 신호를 생성시켜 단말들에게 전송하며, 단말들은 기지국으로부터 수신받은 훈련 신호를 이용하여 기지국의 송신 안테나 별 다운링크 채널 임펄스 응답을 획득하며, 단말은 획득한 채널 임펄스 응답을 이용하여 기지국의 송신 안테나 별 다운링크 채널 특성을 획득하며, 단말이 획득한 다운링크 채널 특성 정보를 기지국으로 피드백하며, 기지국이 단말로부터 수신받은 다운링크 채널 정보를 FFT(Fast Fourier Transform)하여 전체 CSI(Channel Status Information)를 간접적으로 획득하도록 하는 것을 특징으로 한다. 본 발명에 의해 단말의 채널 추정 성능을 향상시킬 수 있으며, MIMO 적용 및 스케쥴링에 활용할 수 있고 다운링크 채널 피드백 전송에 요구되는 업링크 오버헤드를 감소시킬 수 있다. MU-MIMO, 다운링크, CSI, 피드백, 채널 임펄스 응답
Abstract:
An apparatus and a method for mapping a symbol are provided to symbol-map reliability of information bits and reliability of redundancy bits differently, thereby improving performance. A systematic encoder encodes transmission data(S410). An encoder outputs a plurality of information bits including added redundancy bits. A puncher punches an information bit and a redundancy bit(S420). The puncher punches only the redundancy bit except the information bit. An information interleaver interleaves the punched information bit. The redundancy interleaver interleaves a punched redundancy bit(S430). A symbol mapping device maps the interleaved information bit and the interleaved redundancy bit on symbols respectively(S440).