Abstract:
본 발명은 랜덤액세스 프리앰블(random access preamble) 송신 방법에 관한 것이다. 본 발명에서, 2개 이상의 안테나를 스위칭하는 스위칭 블록을 포함하는 이동국은 하향링크 채널 상태에 따라 복수의 안테나 중 하나의 안테나를 선택하여 랜덤액세스 프리앰블을 송신한다. 또한, 2개 이상의 수신 안테나의 수신 전력을 이용하여 이동국의 수신 전력을 결정하고, 결정된 이동국의 수신 전력에 기초해 상향링크 채널의 상태를 파악하여 랜덤액세스 프리앰블 송신 시 송신 전력을 결정한다. 이때, 이동국의 수신 전력을 결정하는 방법은 송수신 방식에 따라 다르며, 주파수 분할 방식을 사용하는 경우에는 모든 안테나의 평균 수신 전력을 이동국의 수신 전력으로 결정하고, 시간 분할 방식을 사용하는 경우에는 송신 안테나로 결정된 안테나의 수신 전력을 이동국의 수신 전력으로 결정한다.
Abstract:
본 발명에 따른 신호 전송 방법은 복수의 채널 심볼을 복수의 주파수 및 시간 영역에 다중화하여 복수의 다중화된 심볼을 생성하는 단계, 송신 안테나, 섹터 및 시간에 따른 복수의 순환 지연 가중 값을 생성하는 단계, 상기 복수의 순환 지연 가중 값과 적어도 두개의 상기 다중화된 심볼을 조합하여 상기 송신 안테나 별 송신 신호를 생성하는 단계, 그리고 상기 송신 신호를 상기 송신 안테나를 통해 전송하는 단계를 포함한다. 따라서 저속으로 이동하는 이동국에게 시간 다이버시티 이득을 줄 수 있으며, 섹터 경계 부근에 위치한 이동국에게 인접 섹터로부터의 간섭을 줄이는 공간 다이버시티 이득을 줄 수 있다. SCH, BCH, 순환 지연 값, 프리코딩, 섹터, 단위 행렬, 공간 다이버시티
Abstract:
An apparatus for manufacturing a semiconductor device is provided to increase productivity of the semiconductor devices by cleaning and drying two semiconductor devices at the same time. An upper bowl(100a) and a lower bowl(100b) are symmetrically installed. A circular semiconductor substrate is positioned inside the upper and lower bowls. The inner space is formed by coupling the upper and lower bowls symmetrically. The upper and lower bowls prevent the dispersion of the solution from the upper semiconductor substrate due to the rotation of the semiconductor device. An exhaust line(104) is installed in the lower bowl for collecting the solution. The exhaust line(102) is formed in the upper bowl for discharging the gas. A slit(101) is formed in one side of the combining surface of the upper and lower bowls. A cleaning unit(200) enters the inside of the bowls through the slit.
Abstract:
A resources mapping method in a mobile communications system for efficiently transmitting data to a terminal in a distribution type mode is provided to reduce signaling overhead and increase frequency diversity and time diversity due to mapping data, which is in a distribution mode, in the resource of shared data channel. Data is mapped by dividing each of a plurality of resources blocks of the first slot assigning data transmitted to the terminal having in the distribution type mode into a plurality of sub resources blocks. Data is mapped with the first slot by dividing each of a plurality of resources blocks of the second slot assigning data transmitted to the terminal having in the distribution type mode into a plurality of sub resources blocks.
Abstract:
A method for mapping the orthogonal code within the secondary synchronization channel symbol is provided to map two short sequence numbers in efficiently by preventing the generation of collision. A binary code is mapped within the secondary synchronization channel symbol by using the non-binary code. A second non-binary code is obtained by cyclic-shifting the non-binary code. The minimum hamming distance between all coding words of the non-binary code and the second non-binary code have to be the arbitrary value or greater. The length of the non-binary code is same as those of the number of per frame binary codes. The non-binary code includes the primary synchronization channel and the secondary synchronization channel in the down link. In the down link, the secondary synchronization channel symbol is transmitted per 10 msec frame.
Abstract:
A method for transmitting and receiving broadcast channel information is provided to transmit all the same system frame values transmitted within an update period of the broadcast channel information by using different bit mapping patterns, thereby obtaining SFN even though a receiver receives only one coding block. First broadcast channel information including a first system frame value is transmitted by using a first bit mapping pattern in a first frame. The first broadcast channel information is transmitted by using the first and second bit mapping patterns in a second frame.
Abstract:
A method for transmitting and receiving bit information is provided to improve the performance of a system by using a binary quadrature phase shift key. A method for transmitting and receiving bit information includes the steps of: generating bit information corresponding to a signal to be transmitted(S11); selecting two time region codes of a plurality of time region codes(S12); generating a complex symbol corresponding to the bit information using two time region codes(S14); and transmitting the bit information using the complex symbol(S20). The complex symbol generation step includes the steps of: generating four time region codes by phase-modulating two time region codes; and generating a complex symbol by selecting one of four time region codes in response to the bit information.
Abstract:
A transmission diversity method for a forward link channel in a wireless communication system and a signal processing method are provided to improve transmission diversity for an MC-CDMA(Multi-Carrier Code Division Multiple Access) type channel in an OFDM(Orthogonal Frequency Division Multiplexing)-based downlink by being used to ACK/NACK channels. Predetermined different output symbols are generated from plural input symbols at one random modulation symbol interval(S900). Orthogonal codes are generated(S910). The output symbols are spread by using the orthogonal codes. The spread output symbols are crossed together as being combined, and the combined output symbols are outputted to each transmission path.
Abstract:
A method for multiplexing a random access preamble for a low speed mobile station and a random access preamble for a high speed mobile station based on a frequency axis is provided to reduce interference between mobile stations by multiplexing a random access band based on a frequency axis in an uplink of a cellular system. A method for multiplexing a random access preamble for a low speed mobile station and a random access preamble for a high speed mobile station based on a frequency axis includes the steps of: multiplexing a random access band using a preamble(100) which is used in a mobile station of a high speed, and a random access band using a preamble(110) which is used in a mobile station of a low speed on a frequency band. All of the mobile station of a high speed and the mobile station of a low speed perform easily a random access by allocating the different number of random access band using the preamble which is used in the mobile station of the high speed and random access band using the preamble which is used in the mobile station of the low speed to the cell based on the characteristics of the cell.
Abstract:
An apparatus for cleaning a substrate is provided to simultaneously supply chemicals and nitrogen gas to the surface of a substrate through a cleaning fluid supplying member by incorporating a cleaning fluid supplying member and an ultrasonic vibrator. A substrate is placed on a substrate support member(100) capable of rotating. A fluid supply member(200) supplies cleaning fluid to the surface of the substrate placed on the substrate support member. An ultrasonic vibrator(300) generates vibration in the fluid supply member to apply ultrasonic vibration to the cleaning fluid. A plurality of injection holes arranged as a lattice type are formed in the fluid supply member, injecting the cleaning fluid to the surface of the substrate.