Abstract:
본 발명은 멀티 유저 미모 시스템에서 송신 간섭 제거 방법에 대한 것으로, 채널 행렬을 디콤포지션하여 퍼뮤테이션 행렬, 제1 행렬 및 제2 행렬에 관한 식으로 나타내고, 상기 제2 행렬과 송신 데이터 벡터의 곱의 놈을 이용하여 가능한 복수의 퍼뮤테이션 행렬 중에서 최적의 퍼뮤테이션 행렬을 결정하고, 상기 결정된 최적의 퍼뮤테이션 행렬을 이용해 제2 행렬을 결정하고 상기 결정된 제2 행렬과 상기 송신 데이터 벡터를 이용하여 송신 프리코딩 벡터를 구한다. 멀티유저미모, 연속간섭제거, 퍼뮤테이션 행렬
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:
PURPOSE: An apparatus and a method for transmitting and receiving a synchronization channel are provided to improve identifier estimation performance under a channel environmental having a severe frequency selectivity. CONSTITUTION: In a apparatus and a method for transmitting and receiving a synchronization channel, a block numerical progression unit produces a plurality of block progression, and transmits the block progression to a synchronous signal generator(S210). The plural subcarriers of the synchronous channel are classified into the plural blocks, and progressions are allocated to each block. A synchronous signal generator produces a synchronizing signal by assigning the plural block progression to the subcarrier of the synchronous channel(S220). A frequency mapping unit generates a downlink frame by mapping the synchronizing signal and transmission data to a time and frequency domain(S230). A transmission unit transmits the downlink frame of the frequency mapping through a transmission antenna(S240).
Abstract:
A transmission controlling apparatus of a base station determining a signal transmission method based on maximum capacity is provided to improve signal transmission efficiency by determining a signal transmission method based on maximum capacity and predict maximum capacity in consideration of a channel correlation relation. A scheduler(112) selects a terminal acquiring the maximum system capacity based on channel information and interference signal information of each terminal corresponding to the selected terminal. A correlation operation(111) produces a channel correlation value based on the feedback channel information. A transmission controller determines the transmission mode based on channel correlation values and feedback channel information. The transmission controller produces the control signal corresponding to the transmission mode.
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 method for deciding the position of mapping symbols, and an apparatus and a method for modulating binary signals are provided to enhance reception capability by implementing constellation in order to minimize symbol error probability when a phase error is in a reception signal. In a method for deciding the position of mapping symbols for mapping binary signals on a complex plane, plural locuses are started from plural points on the complex plane and represented to implement a distance between locuses more than a minimum distance among the plural points(S110). To implement the distance between locuses more than a predetermined distance and a phase between mapping symbols more than a predetermined angle at respective locuses, the position of plural mapping symbols for mapping binary signals is decided(S120).
Abstract:
A beamforming method and an apparatus thereof are provided to improve a detection performance for a packet for a network access transmitted from a terminal before the terminal enters into the network by providing downlink transmission beamforming and uplink reception beamforming schemes. A beamforming apparatus includes at least one receiving antenna(101-104), a data collection unit(201-204), a weight value vector applying unit(301-304), and a detection unit(401-404). The receiving antenna receives a signal from a terminal. The data collection unit acquires and outputs a signal received through the receiving antenna. The weight value vector applying unit sequentially applies and outputs at least one weight value vector to the signal outputted from the data collection unit. The detection unit detects the signal outputted from the weight value vector applying unit according to a weight value.
Abstract:
A linear space-time code generating method for FDFR(Full Diversity and Full Rate), and a multi-antenna system using the space-time code are provided to cope with a channel change effectively and have a minimum complexity in using a maximum induction detector because a space-time codeword has a minimum number of data symbols. When data is inputted to a space-time coder, the space-time coder sets columns and rows of a codeword matrix for determining a space-time code(102). The number of symbols to be transmitted during a single block interval is determined by the product of the number of antennas of a transmitter and a space multiplexing rate(104). A particular column of the codeword matrix is selected and the number of symbols corresponding to the number of antennas is allocated to rows corresponding to the number of the space multiplexing rate in the selected column(106). A complex weight value corresponding to the allocated symbols is allocated to each symbol so as for each symbol to be combined with the complex weight value(108). Different symbols are allocated to each row and each column of the codeword matrix, and each different complex weight value is allocated to the same symbols allocated to each column(110).
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.