Abstract:
본 발명은 무선 통신 시스템의 수신기의 이득 제어 장치 및 방법에 관한 것으로, 특히 다중밴드 OFDM 방식을 사용하는 시스템의 수신기에서 이득 제어 장치 및 방법에 관한 것이다. 본 발명의 일 실시 예에 따른 장치는, 다중밴드 OFDM 방식을 사용하는 무선통신 시스템의 수신기에서 수신 신호의 이득을 조정하기 위한 장치로서, 수신된 신호를 제1자동 이득 제어 신호에 의거하여 증폭하는 증폭기와, 상기 증폭된 신호를 디지털 신호로 변환하는 아날로그-디지털 변환기와, 각 수신 밴드마다 상기 디지털 변환된 신호에서 원하는 수신 밴드의 신호를 추출하며 추출된 신호의 이득을 제2자동 이득 제어 신호에 조정하는 밴드별 수신 신호 추출기들과, 상기 디지털 변환된 신호로부터 전체 밴드의 수신 전력값을 검출하여 출력하는 수신전력 검출기와, 상기 검출된 전체 밴드의 수신 전력값을 이용하여 상기 제1자동이득 제어 신호를 생성하고, 전체 밴드의 전력 정보 및 각 밴드별 자원할당 정보 및 수신 밴드별 수신 전력을 이용하여 상기 각 밴드별 수신 신호 추출기들로 제공할 상기 제2자동 이득 제어 신호를 생성하는 다중밴드 기저대역 처리부를 포함한다. 다중밴드, OFDM, 이득 제어, 자원할당
Abstract:
PURPOSE: A digital pre-distortion(DPD) amplifying device in a multiple antenna system is provided to prevent the increase of system sizes and costs by sharing a DPD feedback path and a DPD algorithm processing part. CONSTITUTION: Correcting parts(411 to 414) pre-distort input signals to be output and output the pre-distorted signals through antennas(441 to 444). Power amplifiers(431 to 434) are in connection with the correcting parts and amplify and output the pre-distorted signals. A distorted information extractor(450) extracts distorted information from feedback signals from the power amplifiers and from the input signals and output the distorted information to the correcting parts.
Abstract:
PURPOSE: A power amplifying system for nonlinear distortion compensation and pre-distortion method are provided to apply a suitable inverse function to a pre-distorter, thereby stably guaranteeing a linear operation. CONSTITUTION: A transmission signal is pre-distorted by a pre-distorter. The distorted transmission signal is amplified by a power amplifier. Adjacent channel power of the amplified transmission signal is measured. The average value of the measured adjacent channel power is calculated(205). A count value increases by comparing the average value with a first threshold value. An inverse function of a transfer function of the power amplifier is generated according to the comparison result between the increased count value and a preset limit value. The inverse function is applied to the pre-distorter(245).
Abstract:
PURPOSE: A PAPR(Peak to Average Power Ratio) reduction apparatus and orthogonal frequency division multiplexing system for the same are provided to reduce the PAPR phenomenon of a signal that is modulated in two or more modulation methods. CONSTITUTION: A clipping level determining unit(620) determines a clipping level for PAPR reduction based on complex modulation method information and average voltage of a modulated signal. A clipping unit(600) clips the signal which is complexly modulated to the determined clipping level. The clipping level determining unit receives the average voltage from a modulating unit. The clipping unit performs nonlinear clipping by using a log function.
Abstract:
PURPOSE: A web-based service account management device and method thereof are provided to protect the privacy of a user by interrupting message reception. CONSTITUTION: An account selector(110) selects one or more user accounts. A hiding setup unit(120) sets up a hiding display of a user account. The account selector selects one or more user accounts. The account selector selects one or more user accounts to the others. The hiding setup unit stores transmitted mail to a preset mailbox.
Abstract:
PURPOSE: A registered person ghost processing apparatus and method thereof are provided to protect reception information about a ghost registered person. CONSTITUTION: A ghost setup determining unit(105) is connected to call request or message receipt. The ghost setup determining unit determines whether to set up ghost of a telephone number of a caller. A reception information controlling unit(113) stores reception information to a ghost memory unit. A receive refusal determining unit(107) determines whether to refuse the reception of a call according to the telephone number.
Abstract:
PURPOSE: A pre-distortion device of a power amplifier and a method thereof are provided to fix a bias voltage of a power amplifier while a complex correction coefficient is updated, thereby distortion of a signal outputted from the power amplifier. CONSTITUTION: A pre-distortion unit(210) calculates the size of an input signal. The pre-distortion unit generates a pre-distortion signal of the input signal by outputting a complex correction coefficient corresponding to the size of the input signal. The pre-distortion unit provides the generated pre-distortion signal as input of the power amplifier. A complex correction coefficient updating unit(240) generates an error signal by comparing an output signal with the input signal of the power amplifier. The complex correction coefficient updating unit updates the complex correction coefficient to minimize the size of the generated error signal. The pre-distortion unit provides a fixed bias voltage value to the power amplifier while the complex correction coefficient is updated.
Abstract:
본 발명은 이동통신 시스템에서 네이밍 서비스를 이용한 핸드오프 방법에 관한 것이다. 본 발명에 따른 핸드오프 방법은, 다중모드 서비스를 수용하는 사용자 단말에서, 네이밍 서비스(naming service)를 이용한 사용자 선택적 핸드오프 방식을 사용한다. 본 발명에 따르면, 이동통신 시스템의 발달에 따라 서비스 시나리오를 확대 시킴으로써, 사용자 응용의 확대를 가져와 SDR(Software Defined Radio) 시스템 수용의 장점을 부각시킬 수 있으며, 최소의 소프트웨어 모듈의 다운로드만으로, 요구하는 서비스를 끊김 없이 제공받을 수 있다. 네이밍, 에스디알, 핸드오프, 콤포넌트
Abstract:
A method for detecting signals in a MIMO(Multiple Input Multiple Output) communication system and a MIMO communication system are provided to correct a colored noise by performing an optimum signal detecting algorithm. A MIMO system includes receiving antennas(120-1~120-N), auto gain control parts(130-1~130-N), and quantization parts(140-1~140-N). The number of receiving antennas is more than the number of transmitting antennas. A gain of each auto gain control part is different. Symbols are transmitted through the transmitting antennas at the same time. The symbols are received through the receiving antennas. The received signals are inputted to a receiving signal processing block through a VGA(Variable Gain Amplifier). A signal detecting part(150) performs an optimum signal detecting algorithm based on a signal quantized in the quantization part.
Abstract:
A decoding method and a decoding device of a retransmission communication system are provided to give a weighted value to a bit string by comparing a received error data with a LLR(Log Likelihood Ratio) value of the bit string including a retransmission data. A transceiving part(110) exchanges a data with a transmitter which transmits the data. The transceiving part exchanges an encoded data by using a turbo code as a channel code. A decoding part(120) decodes the received data by using a turbo decoder. An error checking part(130) checks an error of the decoded data by using a cyclic redundancy check method. A memory(140) stores the data. A LLR calculation part(150) calculates a LLR value of a bit string included in the data. A comparing part(160) compares the LLR value of the bit string included in the data. A data generating part(170) couples the bit string included in the data.