Abstract:
PURPOSE: A correlation apparatus for the strong synchronous acquisition and method uses the distance value about the receiving symbol. The frequency error can be over gotten. CONSTITUTION: The receiving symbol phase difference calculation unit(201) obtains the receiving symbol phase difference between the delay receiving symbol delaying the receiving symbol and the receiving symbol. The correlation symbol phase difference calculation unit(203) obtains the correlation symbol phase difference between the lag correlation symbol delaying the correlation symbol and the correlation symbol. The gradation correlator(205) uses the receiving symbol phase difference and correlation symbol phase difference.
Abstract:
PURPOSE: An electrical transmission device for increasing capacity and a method in a distributed antenna system are provided to transmit signals between repeater stations by using transmitting antennas according to geographic location of the mobile terminal. CONSTITUTION: A base station predicts a channel state information value. The base station calculates correlation between the channel state information value received report through the feedback channel and the anticipated channel state information value. A repeater station is connected to the base station and wire. The signal is transmitted to the mobile terminal. The mobile terminal measures the received power, and the channel state information, interference and sum total of the noises signal electricity from the neighboring repeater station.
Abstract:
PURPOSE: A receiver and a method of restoring data using a multiple antenna are provided to obtain a beam forming gain by using a receive beam forming matrices by minimizing interference from a base station. CONSTITUTION: A receiver and a method of restoring data using a multiple antenna are comprised of the steps: receiving a reception signal through a plurality of antenna(S110); dividing channel matrix and performing spatial demultiplexing of the reception signal through reception beam forming matrices, and then calculating estimation signal(S120); and calculating a reception beam forming vector from the reception beam forming matrix and calculating the estimation signal from the reception signal through a reception beam forming vector(S130).
Abstract:
PURPOSE: A receiver and a method of restoring data using a multiple antenna are provided to obtain a gain of diversity by removing an interference signal of adjacent station and calculating estimation signals, and then combining estimation signals. CONSTITUTION: A receiver and a method of restoring data using a multiple antenna is comprised of the steps: receiving a reception signal through a plurality of antenna(S110); grouping the plural antenna and making groups(S120); calculating an estimation signal which is generated by removing an interference signal from a reception signal; and combining a plurality of estimation signals and restoring data(S130).
Abstract:
PURPOSE: A signal processing apparatus in a distributed antenna system and a method thereof are provided to select an MS which minimally generates influences of interference and use the same frequency resources to transmit a signal, thereby obtaining a performance gain due to multiplexing. CONSTITUTION: A signal processing apparatus in a distributed antenna system comprises the following steps. Channel state information is received from a mobile station included in a coverage of a relay station or a base station(301). A signal transmitted to the mobile station is multiplied by a beam forming vector by using the channel state information. The signal multiplied by the beam forming vector is simultaneously transmitted to the mobile station.
Abstract:
A method for reusing frequencies in a multiple antenna system is provided to reduce the size of interference that a terminal has by removing an interference signal transmitted from an adjacent cell based on the allocation of adaptive frequency domain. A method for reusing frequencies in a multiple antenna system comprises the steps of: receiving judgment information of a terminal; allocating one domain to the terminal in a frequency band that is classified as plural domains based on the judgment information; and transmitting data to the terminal through the allocated domain.
Abstract:
An apparatus and a method for selecting a correlation mode based on a frequency error of a carrier are provided to obtain initial synchronization by selecting the correlation mode according to the corresponding region after calculating a frequency error boundary point between correlation modes. Non-detection probability values are calculated according to a frequency offset normalized in each correlation method(201). A point meeting graphs of non-detection probability values is determined to a frequency error boundary point(202). A correlation mode is selected based on the determined frequency error boundary point(203).
Abstract:
분산 안테나(Distributed Antenna) 시스템에서 신호 처리 방법에 있어서, 궤환 채널을 통해 채널 상태 정보 값을 보고 받고, 상기 채널 상태 정보 값을 이용하여 신호 결합 전송이 필요한지의 유무를 확인하는 과정과, 상기 신호 결합 전송이 필요한 경우 채널 신뢰도를 계산하여 계산된 신호를 이동 단말로 전송하고, 상기 신호 결합 전송이 필요하지 않은 경우 해당 송신 안테나를 이용하여 이동 단말로 신호를 전송하는 과정과, 상기 신호 결합 전송이 필요한 경우에 전송된 신호와 상기 신호 결합 전송이 필요하지 않은 경우에 전송된 신호 이외에 추가적으로 전송이 필요한 경우 상기 일련의 과정을 반복하여 추가적으로 신호를 전송하는 과정을 포함하는 것을 특징으로 한다. 신호 결합, 채널 신뢰도, STBC, STBC-T
Abstract:
A signal combining apparatus capable of satisfying the maximum transmission capacity in a cellular system utilizing a distributed antenna and a resource allocation method using the same are provided to maximize the transmission capacity of the whole cell by sharing channel information of MSs which are randomly distributed in a cell through a wired link between BSs or RSs when signals are coupled in a wired RS system. A base station(BS) compares the channel transmission capacity of a single repay station with the channel transmission capacity obtained by coupling signals of two or more relay stations, in order to select the bigger transmission capacity. One or more relay stations(RS2,RS3) transmit channels to mobile terminals(MS1-MS3) in a single type or a group type. The mobile terminals receive channels from the base station or a single relay station, or channels obtained through the signal coupling from a group of relay stations.
Abstract:
A joint scheduling method and apparatus for improving frequency efficiency and fairness in a multi-channel distributed antenna system which adopts frequency reuse and joint power control are provided to reduce outage caused by interference in a service area and to enhance transmission efficiency by interlinking a scheduling unit with power control and channel allocation mechanism. A joint scheduling apparatus for improving frequency efficiency and fairness in a multi-channel distributed antenna system includes a base station, plural relay stations and plural mobile stations. The base station receives data request signals via each relay station or directly from the mobile station and transmits the requested data to each relay station or directly to the mobile station. The relay stations transmit information on mobile stations in each corresponding coverage and allocate resources to each mobile station. The mobile station receives allocated resources from the base station or each relay station and updates data. The base station includes a user queue, a packet scheduler, a channel coding unit and a radio resource management unit. The base station selects packets according to a scheduler of each user queue, realizes resource management via the radio resource management unit, and transmits information to the mobile station, directly or via the relay station.