Abstract:
PURPOSE: An SDMA system using a single transmitting/receiving antenna wireless repeater in a system and a method thereof are provided to efficiently and economically install the system with a wireless repeater when a signal from a multi-antenna base station is transmitted. CONSTITUTION: A base station(100) selectively transmits a plurality of data stream signals to wireless repeaters in a region thorough a multi-transmitting antenna for downlink. The wireless repeaters comprise a group in a region of the base station, and deliver data stream signals to a terminal. The base station includes a channel collector and a signal processing part.
Abstract:
PURPOSE: An apparatus and a method for mapping symbol are provided to improve reception performance by using a different mapping method in retransmission from a mapping method in initial transmission. CONSTITUTION: In a device, transmitted-data is encoded and a plurality of information bits and bits are generated(S410). An information bit and redundancy bit are mapped to a symbol in initial transmission according to a first mapping method(S420). The information bit and redundancy bit are mapped to a symbol in retransmission according to a second mapping method(S450). The second mapping method is different from the first mapping method. The reliability of mapping bit through the first mapping method is different from that of the second mapping method.
Abstract:
A low power beam forming strategy using a multiple antenna is provided to prevent power consumption of a base station in case signal is transmitted to the uplink by utilizing the multiple antenna. One or more training signal is received from a plurality of base station antennas by using a plurality of mobile station antenna(S310). The downlink channel by cell site antennas and mobile station antennas uses the training signal(S320). The beam vector is generated by using the downlink channel(S350). The beam is formed by applying the beam vector on mobile station antennas(S370).
Abstract:
A method for connecting and relaying between a base station and repeaters for spatial division multiple access is provided to connect a base state with a multiple antenna with a repeater effectively, thereby increasing a sector capacity. A base station(100) including a plurality of antennas transmits data symbols including a plurality of pilot signals. The number of the pilot signal is the same as those of the number of antennas. Each pilot signal comprises an identifier of a corresponding antenna. The base station receives area information generated from a plurality of terminals positioned within a relay area based on the plurality of pilot signals. The base station checks location information with regard to the terminals based on the area information and selects a terminal which will transmit a data stream among at least one terminal located in the relay area. The base station transmits the data stream to the selected terminal.
Abstract:
A multi-carrier based mobile communication system and a channel estimation method thereof are provided to estimate precisely a channel in a high-speed mobile system by minimizing ICI(Internal Carrier Interference) using grouped pilots. A transmitting unit in a multi-carrier based mobile communication system comprises a pilot creation module(200), a spread spectrum module(100), an IDFT(Inverse Discrete Fourier Transform) module(300), and a parallel-serial conversion module(400). The pilot creation module(200) creates grouped pilots, based on previously stored pilots. The spread spectrum module(100) creates received serial data into parallel data, performs spectrum spreading for the created data, and adds the grouped pilot to them. The IDFT module(300) executes IDFT for the data received from the spread spectrum module(100). The parallel-serial conversion module(400) converts the IDFT-processed data into serial data.
Abstract:
본 발명은 통신장비의 시험 분석 장치에 관한 것이다. 본 발명은 통신장비와의 데이터 송수신을 위한 ADC/DAC와, ADC/DAC를 통해 송수신되는 데이터를 임시 저장하는 메모리부와, ADC/DAC와 메모리부를 제어하고 통신장비 시험 분석을 위한 동작을 수행하도록 하는 제어부를 포함하는 NRPB와 이와 연결하여 NRPB를 제어하는 일반 PC로 구성되며, RF 보드를 추가함으로써 유선 뿐만 아니라 무선 통신장비의 기능 시험 분석이 가능하도록 한다. 따라서, 본 발명에 따르면 통신장비 시험용 하드웨어 및 소프트웨어를 구성하여 일반 PC에 연결/장착하여 기능 시험 분석 장치를 쉽게 구현하고, 변형이 손쉽게 하여 융통성을 가지도록 한다.