Abstract:
본 발명은 이동통신 시스템에서 전력제어와 오류정정 부호를 결합하는 방법 및 장치에 관한 것이다. 이동통신 단말기는 오류정정 부호에 의해 부호화된 부호심볼을 전송할 채널에 대해 추정된 채널 전력 이득에 대한 정보를 획득하고, 상기 채널 전력 이득이 미리 정해지는 전력 차단 임계값 이상이면 상기 부호심볼에 대해 상기 채널 전력 이득에 따라 결정된 전력을 할당한다. 반면 상기 채널 전력 이득이 상기 전력 차단 임계값 이상이 아니면 상기 부호심볼에 대해 제로의 전력을 할당하여 전력을 차단한다. 이러한 본 발명은 전력제어와 오류정정 부호를 결합하여 부호화 이득과 전력 이득을 최대화할 수 있다.
Abstract:
본 발명은 OFDM 시스템에서 사전부호화 기법을 통해 부채널 간 간섭을 제거하기 위한 간섭제거방법에 관한 것으로, 본 발명에서는 부채널간 간섭 제거를 위해 다수의 파일럿 부채널로 이루어지는 하나 이상의 파일럿 부채널 그룹들을 데이터 부채널들과 관련하여 등 간격으로 배치하여 전송신호를 생성하고 상기 전송신호에 사전부호화 행렬을 적용하여 전송한다.
Abstract:
PURPOSE: A pilot transceiving device and a method in a communication system using a multi carrier modulation method are provided to transceive a pilot symbol having a type that two sequences having different lengths are repeated, thereby expanding a frequency offset which can be estimated for frequency synchronization acquisition, consequently an exact frequency synchronization can be acquired. CONSTITUTION: The first pilot sequence which is shorter than a set length is generated. The second pilot sequence different from the first pilot sequence is generated, and wherein the second pilot sequence is shorter than the set length. The first pilot sequence is repeated as much as preset frequency, and the second pilot sequence is repeated as much as set frequency. The repeated first and second sequences are combined together, to generate a pilot symbol. The pilot symbol is transmitted.
Abstract:
PURPOSE: A mobile communication device including base station/mobile station multiple antennas and a method thereof are provided to reflect down characteristics of space channels by antenna, which are located between a base station and at least two mobile stations, and to simultaneously consider down characteristics of all the mobile stations, thereby forming an optimal base station antenna beam. CONSTITUTION: A base station(11) restores weighted information and channel state information determined in mobile stations(13,15,17) from feedback signals received from the mobile stations(13,15,17) by reflecting the first characteristics, determines downlink search information satisfying a maximum transmission channel capacity from the restored information, and selects the mobile stations(13,15,17), determines downlink track information from the restored information. The base station(11) operates the downlink track information by a matrix multiplying process, combines data signals with the downlink search information and pilot signals, and transmits combined results to the selected mobile stations(13,15,17) in frame units. The base station(11) has at least two base station antennas, and the mobile stations(13,15,17) have at least two mobile station antennas. The first characteristics correspond to down characteristics of base station/mobile station multiple antenna channels.
Abstract:
PURPOSE: A mobile communication system and a method for increasing communication efficiency are provided to reduce the delay of channel information by grouping a MCS(Modulation and Coding Scheme) level at a receiving unit to supply broad channel information to a transmitting side. CONSTITUTION: A demodulation and decoding unit(82) demodulates and decodes an information signal to detect CRC(Cyclic Redundancy Channel) data and information data for checking an error contained in the information signal. A channel quality measurement unit(84) uses a pilot signal to measure the data transfer capacity of the data channel receiving the information signal. An MCS group selecting control unit(86) groups n(>0) numbers of previously defined MCS levels as m(n>m>0) numbers of continuous MCS levels according to the performance of the data channel, draws MCS group information according to the channel quality as a predetermined period, and transfers an ACK or a NACK signal according to a normal reception of the CRC data to a transmitting unit.
Abstract:
PURPOSE: A method and a device for automatically resetting an electronic cash register are provided to automatically reset the system in response to a wrong operation of the system. CONSTITUTION: Normal clocks are outputted from a CPU(Central Process Unit) by normal operation. A watchdog timer counts the clocks. By counting a specific number of clocks, a logic high signal is output to an interrupt terminal of the CPU. Otherwise, a logic low signal is output to the CPU. Then, a presently processed data is stored for outputting a trigger signal through an output port(P1). A reset circuit unit receives the trigger signal for outputting a reset signal to a reset terminal of the CPU. By the reset signal, a system is reset.
Abstract:
PURPOSE: A device for preventing error of a printing sensor of a cash register is provided to improve dependence of a system by preventing error of a printer with reducing the collector current in case that the collector current of a photo-transistor increases more than the emitter current. CONSTITUTION: The device for preventing error of the printing sensor of the cash register includes a sensor driving detecting portion, a micom(30) and a sensor error preventing circuit portion(40). The sensor driving detecting portion is composed of a sensor(10) and a 74HCT574(20). The sensor(10) is composed of a photo-transistor(Q1) and a photo-diode. The 74HCT574(20) permits the low or high level signal to the sensor driving signal terminal(Do) of the micom(30) according to the driving signal of the sensor(10). The sensor error preventing circuit portion(40) prevents error of the sensor(10) by interfering the current over the rated current permitted to the sensor(10). The micom(30) controls operation of the sensor(10) by judging the error of the sensor(10) with inputting the detected result of the sensor driving detecting portion and by outputting the driving signal to the sensor error preventing circuit portion(40) in case of error of the sensor(10).
Abstract:
PURPOSE: A security device using electronic cash register is provided to maximize security of a store with low cost by enabling an ECR(Electronic Cash Register) to notify a security service company inputted previously when it senses illegal opening of valuables storage or place which can be invading route of a store. CONSTITUTION: In an ECR which executes information management about sale, a store security device using electronic cash register includes an opening sensing senor(31,32,33) which is installed in an invading gateway of a store or a valuables storage and senses illegal opening; a memory(50) which stores a phone number of a report place; a communication executing part(60) which calls the phone number of the report place stored in the memory(50); and a central managing part(10) which determines an opening based on a sense signal from the opening sensing sensor(31,32,33) and drives the communication executing part(60) in case it is determined there is an opening.
Abstract:
본 발명은 일정 시간 동안 금전 등록기를 사용하지 않을 경우 자동으로 전원을 차단하였다가 다시 사용하고자 하는 입력이 들어오면 다시 금전 등록기에 전원을 공급해줌으로서 소비전력을 줄일 수 있도록 한 절전용 금전 등록기에 관한 것으로서, 상용 교류 전원을 감압, 정류 및 평활하여 맥류가 포함된 전압을 발생하는 전원부; 상기 전원부로부터 공급받은 전원을 처리하여 기기의 로직 회로 구동 전압을 발생시키는 로직 전원 공급부; 상기 전원부로부터 공급받은 전원을 처리하여 기기의 각종 직류 부하 구동 전압을 발생시키는 직류 전원 공급부; 상기 직류 전원 공급부로의 전원 공급을 단속하는 전원 제어부; 일정시간 동안 금전 등록기를 사용하지 않을 경우 상기 직류 전압 공급부로 공급되는 전원이 차단되도록 상기 전원 제어부를 동작시키는 마이컴; 및 상기 마이컴에 공급되는 상기 로직 전원이 전원이 차단되었을 때 상기 마이컴에 전원을 공급하는 배터리 전원 공급부를 구비하여 이루어지는 절전용 금전 등록기에 있어서, 상기 직류 전원 공급부를 상기 로직 전원 공급부의 앞단에 설치하여 상기 직류 전원 공급부로 공급되는 전원의 차단시 상기 로직 전원 공급부에 공급되는 전원도 함께 차단시킴으로서 절전을 도모한 것을 특징으로 한다.