Abstract:
The present invention discloses an equalization apparatus and a method in a capsule endoscope system, an external control unit, and the capsule endoscope system. The equalization apparatus in the capsule endoscope system selectively updates a filter coefficient by comparing the average error power in an observation period of a reference signal with a transmitter.
Abstract:
The present invention relates to a method and a device for synchronizing a terminal in a wireless communication network. A method for synchronizing a terminal according to one implementation example of the present invention can include the following steps: an initial monitoring step for determining whether a synchronization signal is received and accordingly setting a synchronization signal reference time in an initial monitoring section of at least two frames; a transmission/reception repeating step for determining whether a synchronization signal is received and accordingly setting a synchronization signal reference time in a synchronization signal monitoring section, and transmitting a synchronization signal based on the synchronization signal reference time in a synchronization signal transmission section during a transmission/reception repeating section where synchronization signal monitoring sections and synchronization signal transmission sections are alternately placed, after the initial monitoring step; and a dedicated monitoring step for determining whether a synchronization signal is received and accordingly setting a synchronization signal reference time in a dedicated monitoring section of at least two frames, after the transmission/reception repeating step. According to one implementation example of the present invention, terminal synchronization can be implemented without the help of an infrastructure like a base station, an access point, etc. [Reference numerals] (310) Initial monitoring section;(320) N_PO frame;(330) Dedicated monitoring section;(AA) Start communications;(BB,DD) Two frames;(CC) One frame;(EE) Time
Abstract:
의료용 인 바디(in-body) WBAN 시스템에 있어서 잡음 성능이 우수한 변조 방식을 기반으로 SNR 손실을 감소시키고 BER의 성능을 향상시킬 수 있는 변조 방법 및 장치가 개시된다. WBAN 시스템을 위한 변조 장치는 맨체스터 코드(Manchester code)를 그루핑하여 심볼 조합을 생성하고 전송하고자 하는 정보를 상기 심볼 조합과 맵핑하는 심볼 맵핑부 및 상기 정보가 맵핑된 심볼 조합을 복조 장치로 전송하는 전송부를 포함한다. 따라서, 잡음 성능이 우수한 맨체스터 코드(Manchester code)를 기반으로 그루핑을 수행함으로써 GPPM에 비하여 잡음 성능 향상으로 인한 SNR 이득을 얻을 수 있다. 또한, 부분 상관 방식 및 그레이 코딩(gray coding)을 적용함으로써 BER 성능의 향상이 도모된다.
Abstract:
PURPOSE: A detection method and device of a time offset for the initial ranging of a fixed-type wireless communications system are provided to improve performance degradation caused by code errors. CONSTITUTION: A detection device (1300) of a time offset for the initial ranging of a fixed-type wireless communications system includes an interval dividing part (1310), an error generation determining part (1330), and an error correcting part (1350). The interval dividing part divides a symbol into a confidence interval and a distrust interval, designates an interval containing a code transition point as the distrust interval, and designates an interval not containing the code transition point as the confidence interval. If a time offset value, which is estimated through a differential operation between sub-carriers separated by d numbers, is included in the distrust interval, the error generation determining part determines whether a code error is generated. If a code error is generated according to the determination result, the error correcting part corrects the code error. [Reference numerals] (1310) Interval dividing part; (1330) Error generation determining part; (1350) Error correcting part; (1370) Aggravated equalization part
Abstract:
개시된 기술은 부분 전이중 중계 방식을 이용한 동기 신호 수신 방법에 관한 것으로, 보다 자세하지만 제한됨 없이는, 3GPP LTE-A 시스템의 타입 1 릴레이가 부분 전이중 중계 방식을 이용하여 기지국으로부터 동기 신호를 수신하는 방법에 관한 것이다. 실시예들 중에서, 무선 통신 시스템에서 기지국(eNodeB)과 동일한 대역을 사용하여 신호를 송신하는 릴레이(Relay)가 상기 기지국으로부터 동기 신호를 수신하는 방법은 상기 릴레이와 연결된 단말에게 제1 신호를 송신하는 동시에 상기 기지국으로부터 동기 신호를 수신하는 단계; 상기 수신된 신호에 포함된 자기간섭(self-interference) 성분을 제거하는 단계; 및 상기 자기간섭 성분이 제거된 수신 신호를 복호화하는 단계를 포함한다.
Abstract:
PURPOSE: A synchronization signal receiving method using a part full duplex relay system is provided to allow a relay to receive a synchronization signal from a relay and to increase performance of cell ID detection. CONSTITUTION: A relay estimates a channel between a transmission antenna and a reception antenna of a relay(S710). The relay transmits a first signal to a terminal connected to the relay. The relay receives a synchronization signal from a base station(S720). The relay removes self-interference components included in the received signal(S730). The relay encodes a reception signal(S740).
Abstract:
PURPOSE: A synchronous signal transmission method in a wireless communication system is provided to prevent performance deterioration of a timing synchronizing algorithm due to a pattern overlapping phenomenon. CONSTITUTION: A base station generates a real number component of a new synchronizing signal(S710). The base station generates imaginary number component(S720). The base station transmits new synchronization signal to the terminal(S730). A correlator calculates a correlation value of a receiving signal and a reference signal within a reference signal group(S740).
Abstract:
PURPOSE: An automatic gain controller for a dual mode receiver in a wireless communication system is provided to maintain a receiving signal at a fixed amplitude level by the reduction of the amplitude distortion of the received signal. CONSTITUTION: A GCA(Gain Controlled Amplifier) amplifies a received signal according to a control gain value. An ADC(Analog to Digital Converter)(320) converts the output signal of the GCA into a digital signal. An amplitude estimator(330) detects the amplitude of the amplified signal. A comparator(340) determines a control gain value. A control unit calculates the power ratio based on the digital signal. If the power ratio is bigger than a predetermined reference value, the control unit reflects the power rate to the control gain value.
Abstract:
PURPOSE: A frequency offset estimating device and a frequency offset estimating method are provided to stably estimate a frequency offset in a dual mode of a FDD(Frequency Division Duplex) and a TDD(Time Division Duplex). CONSTITUTION: A plurality of differential filters(151) generates conjugated complex number having different correlation interval about a signal of a frequency domain. The differential filters generate a plurality of different correlation signals. After dividing a real number part and an imaginary number part about differential correlation signal of each differential correlation signal and a reference signal. A frequency control unit(157) adjust frequency synchronization of the received signal.
Abstract:
비동기 셀 간섭을 완화하기 위한 MIMO-OFDM 통신 시스템의 공간 공분산 행렬(SCM: Spatial Covariance Matrix) 추정 방법을 이용한 셀간 간섭 완화 방법 및 셀간 간섭 완화 수신 장치가 개시된다. 셀간 간섭 완화 방법은 수신된 OFDM 심볼의 RS(Reference Symbol) 신호를 추출하여 채널 추정하는 단계, RS 신호와 채널 추정 결과를 이용하여 초기 SCM을 추정하는 단계, 초기 SCM에 대하여 시간 영역 싱크 타입 웨이팅(sinc type weighting)을 적용하여 SCM을 추정하는 단계 및 채널 추정 결과와 추정된 SCM을 이용하여 셀간 간섭 완화된 데이터 심볼을 복조하는 단계를 포함하여 구성한다. 시간영역 싱크 타입 웨이팅을 SCM 추정에 적용함으로써, 유효 반송파 구간과 보호 대역 구간 경계점에서의 급격한 신호변화에 따른 스펙트럴 리키지에 의한 SCM 추정의 오류를 줄일 수 있고, IFFT와 FFT를 이용한 주파수-시간-주파수 영역의 변환 대신 주파수 영역 신호에 대한 이동 평균 필터 형태의 간단한 설계가 가능해진다. OFDM, 공간공분산행렬, SCM, 채널추정, 셀간간섭, ICIM