Abstract:
상기 기술적 과제를 해결하기 위하여 본 발명에서 제시하는 순방향 동기신호 전송방법에 관한 것으로, 무선통신 시스템에서의 순방향 동기신호 전송방법에 있어서, 복수 개의 싱크블록으로 구성되는 프레임을 생성하는 단계와 상기 프레임을 순방향 링크를 통해 전송하는 단계를 포함하고, 상기 프레임은 싱크블록 타이밍 정보를 제공하는 제1 동기채널 시퀀스 및 프레임 타이밍 정보를 제공하는 복수 개의 제2 동기채널 시퀀스를 포함하고 상기 제1 동기채널 시퀀스와 상기 복수 개의 제2 동기채널 시퀀스에 의해 셀 식별자를 특정하며, 상기 제1 동기채널 시퀀스 및 상기 복수 개의 제2 동기채널 시퀀스를 시분할 듀플렉스(Time Division Duplex) 및 주파수 분할 듀플렉스(Frequency Division Duplex) 시스템에서 모두 사용하는 것을 특징으로 하며, FDD와 TDD 모드의 듀얼모드 이동국의 복잡도를 현저히 줄이게 된다. OFDM, 동기채널, 셀 탐색, FDD/TDD
Abstract:
A data transmission method of a mobile communication system and a device thereof are provided to transmit data to another beam, and to apply a time diversity phase weight value and a space diversity phase weight value to factors of a precoding vector matrix, thereby improving space and time diversity gains. An SFBC(Space-Frequency Block Coding)-OFDM(Orthogonal Frequency Division Multiplexing) encoder encodes data(S310). A precoding vector multiplexer selects two different precoding vectors(S320). A precoder performs a precoding process(S330). A precoded signal matrix is converted into a transmission signal of a time domain through an IFFT(Inverse Fast Fourier Transform) process(S340). The analog transmission signal is converted into an RF(Radio Frequency) to send the converted signal(S350).
Abstract:
A signal transmission method and a downlink frame generation method are provided to be capable of magnifying a time diversity gain within a TTI(Transmission Time Interval) of broadcasting channel information by applying a precoding vector switching diversity method to the broadcasting channel information, as efficiently removing interference. A channel encoder generates and outputs channel-encoded BCH(Broadcasting Channel) data(S201). An SCH(Synchronization Channel) symbol generator generates and outputs plural SCH symbols(S203). Plural other channel symbols are generated and outputted(S205). Precoding vectors are applied to BCH symbols to output the BCH symbols, while the SCH symbols and the other channel symbols are switched, then the switched symbols are outputted to the first and second transmitters(S207).
Abstract:
A signal transmitting method and a signal receiving method are provided to demodulate broadcast channel information effectively when an MS(Mobile Station) is located at a sector boundary. A down-converter converts a received downlink signal into a baseband signal and outputs the same(S301). An SCH(Synchronization Channel) BCH(Broadcast Channel) band filter filters an SCH band signal and a BCH band signal from the baseband signal and outputs the same(S303). A cell searching unit checks a home sector and one or more target sectors through the SCH band signal(S305). A guard interval removing unit removes a guard interval such as a CP from the SCH band signal and the BCH band signal(S307). A Fourier transforming unit performs FFT(Fast Fourier Transform) on the guard interval-removed SCH band signal and BCH band signal to generate a plurality of SCH reception symbols and a plurality of BCH reception symbols transmitted in a plurality of subcarriers, and outputs the same(S309). A channel estimating unit checks whether there is a target sector which has been searched by the cell searching unit(S311). If the cell searching unit fails to acquire an ID of a target sector, the channel estimating unit estimates a channel state from the SCH reception symbols of a home sector(S313). A BCH demodulating unit estimates BCH symbols from the BCH reception symbols outputted from the Fourier transforming unit(S315). A BCH decoder performs decoding on the plurality of BCH symbols to generate BCH information(S321).
Abstract:
A random access preamble transmission method is provided to enable an MS(Mobile Station) to send a random access preamble by selecting one of antennas according to a downlink channel state, thereby reducing delay time occurring when the random access preamble is transmitted. An MS receives a BCH(Broadcasting Channel) signal periodically transmitted from a base station(S100). The MS measures received power for each of two antennas(S101). The MS determines an antenna having high received power as a random access preamble transmission antenna(S102). The MS determines received power of the MS(S103). The MS determines random access preamble transmission power by using an open loop power control method(S104). The MS transmits a random access preamble of the determined transmission power by using the determined transmission antenna(S105).
Abstract:
본 발명은 시공간 블록 코드 방식의 래티스 인코딩(Lattice Encoding) 과정에서 상위 인터페이스 메모리에 저장되어 있는 데이터를 이용하여 독립적으로 처리하고, 각 PRBS(Physical Resource Blocks) 별로 자원 할당 과정을 독립적으로 수행함으로써, 추가적인 별도의 메모리를 사용하지 않으면서도 자원 할당 과정도 용이하게 처리할 수 있는 상위 인터페이스 메모리를 이용한 시공간 블록 코드 방식의 인코딩 장치 및 그 방법에 관한 것으로, 제1 직교주파수분할다중(OFDM) 심벌 구간 동안에, 상위 인터페이스 메모리로부터 두 OFDM 심벌 구간 동안의 스케줄 데이터를 읽어오기 위한 인터페이스 메모리 처리 수단; 상기 제1 OFDM 심벌 구간 동안에, 상기 상위 인터페이스 메모리에 저장되어 있는 상기 두 OFDM 심벌 구간에 전송하기 위한 물리자원블록을 이용하여 상기 두 OFDM 심벌 구간 동안의 스케줄 데이터를 인코딩하는 인코딩 수단; 상기 제1 OFDM 심벌 구간 동안에, 상기 인코딩수단에 의해 인코딩된 결과와 상기 상위 인터페이스 메모리에 저장되어 있는 자원할당 제어정보를 이용하여 각 물리자원블록 별로 자원 할당을 수행하는 자원 할당 수단; 및 상기 제1 OFDM 심벌 구간 동안에, 상기 자원 할당 수단에 의해 할당된 신호를 변조하고, 제2 OFDM 심벌 구간의 시작 시점에 상기 제1 OFDM 심벌 구간 동안에 변조된 변조신호가 전송되도록 하는 변조 수단을 포함한다. STBC, Block Coding, 인코딩, 블록 코딩, 래티스 인코딩
Abstract:
A space time block code lattice encoding apparatus using an interface memory and a method thereof are provided to reduce resource usage by performing a space time block code lattice encoding without an additional memory. A space time block code lattice encoding method using an interface memory include the steps of: reading an SDCH(Scheduled Data Channel) data of first and second OFDM(Orthogonal Frequency-Division Multiplexing) symbol sections from an interface memory for a first OFDM symbol section(302); encoding the SDCH of the first and second OFDM symbol sections through a space time block code scheme(304); allocating a resource based on the encoded result and resource allocation control information stored in the interface memory(306); modulating a signal to which the resource is allocated(308) in the first OFDM symbol section; in the second OFDM symbol section, transmitting a modulation signal corresponding to the SDCH data of the first OFDM symbol section(310); and in a third OFDM symbol section, transmitting a modulation signal corresponding to the SDCH data of the section OFDM symbol section(312).
Abstract:
A random access method and a random access response method are provided to enable an MS to select a downlink resource optimized to a downlink channel status and transmit information about the downlink resource to a BS(Base Station) when the MS attempts random access, thereby increasing the transfer rate of the random access response of the BS to improve the reliability of the random access response of the BS. A random access response method comprises the following steps of: transmitting a common pilot signal(S101); receiving the index of at least one downlink resource selected on the basis of the common pilot signal from an MS(Mobile Station)(S103); and transmitting a response to the random access of the MS by using the index of at least one downlink resource(S104).
Abstract:
통신 시스템에서, 할당된 주파수 대역이 복수의 주파수 그룹으로 분할되고, 각 주파수 그룹에 복수의 프리코딩 행렬 중 일부 프리코딩 행렬이 할당되거나 복수의 송신 안테나 중 일부 송신 안테나가 할당되어 있다. 그리고 단말은 복수의 주파수 그룹 중에서 채널 특성이 좋은 주파수 그룹에 대한 정보를 기지국으로 피드백하고, 기지국은 단말로부터 피드백된 주파수 그룹과 해당 주파수 그룹에 할당된 프리코딩 행렬 또는 송신 안테나를 이용하여 신호를 송신한다. 주파수, 그룹, 피드백, 빔형성, MIMO, 프리코딩 행렬
Abstract:
A method and an apparatus for transmitting SCH(Synchronous CHannel) signals and BCH(Broadcast CHannel) signals in a mobile communication system are provided to improve the performance of channel estimation and to increase the efficiency of broadcast channel demodulation by transmitting a plurality of SCH preambles and a plurality of BCH signals through respectively different beams. An SCH preamble and BCH multiplexer multiplexes two SCH preambles and two BCH signals(S310). A precoding vector multiplexer selects precoding vectors to be used for precoding(S320). A precoder executes precoding by multiplying the preambles and the BCH signals by the selected precoding vectors(S330). An IFFT(Inverse Fast Fourier Transformer) converts the precoded SCH preambles in time-domain Tx signals through inverse fast fourier transformation(S340). An RF(Radio Frequency) transmitter converts the analog Tx signals into RF signals and transmits them through an antenna(S350).