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    • 3. 发明公开
    • 프레임 동기화 방법 및 이를 위한 통신 모뎀용 수신 장치
    • 框架同步方法及其通信调制解调器的接收器
    • KR1020100062820A
    • 2010-06-10
    • KR1020090025866
    • 2009-03-26
    • 한국전자통신연구원
    • 박기혁구본태엄낙웅
    • H04L7/02
    • H04L7/041
    • PURPOSE: A frame synchronization method and a receiving apparatus for a communication modem therefore are provided to reduce a sustained correlation operation of a frame synchronizer by sensing a synchronization failure using a correlation value of a de-spreader. CONSTITUTION: A frame synchronizer implements a correlation operation of preamble with recent received data in a state of inputting of each received data(S410). The frame synchronizer decides a location of the maximum value by periodically observing the location of the maximum value of correlation values(S420). The frame synchronizer outputs the synchronized received data and a synchronization signal for periodically informing a start of the frame in a synchronization gaining mode(S430). The frame synchronizer discontinues the successive correlation operation(S440). A de-spreader calculates the correlation values of spreading codes and a synchronized received data row(S450). A comparator compares the maximum value and a critical value among the correlation values(S460).
    • 目的:提供一种用于通信调制解调器的帧同步方法和接收装置,用于通过使用去扩展器的相关值感测同步失败来减少帧同步器的持续相关操作。 构成:帧同步器在输入每个接收到的数据的状态下实现前同步码与最近的接收数据的相关操作(S410)。 帧同步器通过周期性地观察相关值的最大值的位置来决定最大值的位置(S420)。 帧同步器输出同步的接收数据和同步信号,用于以同步增益模式周期性地通知帧的开始(S430)。 帧同步器中断连续相关运算(S440)。 解扩器计算扩展码和同步接收数据行的相关值(S450)。 比较器比较相关值中的最大值和临界值(S460)。
    • 7. 发明授权
    • 고속 데이터 전송을 위한 인체통신 시스템
    • 用于高速数据传输的内部通信系统
    • KR100770010B1
    • 2007-10-25
    • KR1020060096272
    • 2006-09-29
    • 한국전자통신연구원
    • 김태준강성원김경수김정범임인기형창희박형일박덕근김성은김진경황정환성진봉김혁박기혁
    • H04B13/00
    • H04B13/005
    • A human body communication system for fast data transmission is provided to reduce inter-user interference by limiting a frequency band for signals, which is able to be supplied to the human body, and to increase a data rate by obtaining the maximum gain within the limited frequency band. A transmitter(10) in a human body communication system comprises a source coder(100), a CRC(Cyclic Redundancy Check) coder(101), a channel encoder(102), an interleaver(103), a mapper(104), a spreader(105), and a pulse shaper/IQ modulator(106). If the source coder(100) codes source information into digital Tx data, the CRC coder(101) inserts a CRC code in the coded Tx data. The channel encoder(102), selectively supporting a HARQ function, executes channel encoding for the output of the CRC coder(101). The interleaver(103) performs block interleaving so as to change a burst error into a random error. The mapper(104), or a constellation mapper, symbolizes the Tx data outputted from the interleaver(103). The spreader(105) executes band spreading for the symbolized Tx data using a spreading code, of which the code length is fixed according to a data rate and a limited frequency range. The pulse shaper/IQ modulator(106) creates a baseband signal, which has a limited frequency range so that the human body can maintain waveguide characteristics, for the Tx data outputted from the spreader(105) and executes digital orthogonal modulation for the created baseband signal.
    • 提供用于快速数据传输的人体通信系统,以通过限制能够提供给人体的信号的频带来减少用户间干扰,并且通过获得限制内的最大增益来增加数据速率 频带。 人体通信系统中的发射机(10)包括源编码器(100),CRC(循环冗余校验)编码器(101),信道编码器(102),交织器(103),映射器(104) 扩张器(105)和脉冲整形器/ IQ调制器(106)。 如果源编码器(100)将源信息编码成数字Tx数据,则CRC编码器(101)在编码的Tx数据中插入CRC码。 选择性地支持HARQ功能的信道编码器(102)对CRC编码器(101)的输出执行信道编码。 交织器(103)执行块交织,以将突发错误改变为随机误差。 映射器(104)或星座映射器表示从交织器(103)输出的Tx数据。 扩展器(105)使用扩展码对符号化的Tx数据执行频带扩展,其扩展码根据数据速率和有限的频率范围固定码长。 脉冲整形器/ IQ调制器(106)创建基带信号,该基带信号具有有限的频率范围,以使得人体能够维持从扩展器(105)输出的Tx数据的波导特性,并对所创建的基带执行数字正交调制 信号。
    • 10. 发明公开
    • 저전력 복소수 곱셈기
    • 低功率复合数乘法器
    • KR1020030047523A
    • 2003-06-18
    • KR1020010078171
    • 2001-12-11
    • 한국전자통신연구원
    • 박기혁엄낙웅김보우
    • G06F7/44
    • PURPOSE: A low-power complex number multiplier is provided to reduce an electric power consumption by operating the optimum multiplier only in the case that a real number and an imaginary number of two input complex numbers are identical. CONSTITUTION: In a complex number multiplier for calculating the product of two complex numbers('x', 'y'), the first multiplier(201) multiplies a real number of 'x' by a real number of 'y'. The second multiplier(202) multiplies an imaginary number of 'x' by an imaginary number of 'y'. The third multiplier(203) multiplies a real number of 'x' by an imaginary number of 'y'. The fourth multiplier(204) multiplies an imaginary number of 'x' by a real number of 'y'. A subtracter(205) calculates a difference of output values of the first multiplier(201) and the second multiplier(202), and calculates a real number of the product of two complex numbers('x', 'y'). An adder(206) calculates the sum of the output values of the third multiplier(203) and the fourth multiplier(204), and calculates an imaginary number of the product of two complex numbers('x', 'y'). A selection unit(300) is included between the third multiplier(203)/the fourth multiplier(204) and the adder(206) for inputting the output values of the first multiplier(201) and the second multiplier(202) to the adder(206) in the case that at least one real number and at least one imaginary number are identical.
    • 目的:提供低功率复数乘法器,仅在两个输入复数的实数和虚数相同的情况下通过操作最佳乘法器来降低功耗。 构成:在用于计算两个复数('x','y')的乘积的复数乘法器中,第一乘法器(201)将实数“x”与实数“y”相乘。 第二乘法器(202)将虚数“x”乘以虚数“y”。 第三乘法器(203)将实数“x”乘以虚数“y”。 第四乘法器(204)将虚数“x”乘以“y”的实数。 减法器(205)计算第一乘法器(201)和第二乘法器(202)的输出值的差,并计算两个复数('x','y')的乘积的实数。 加法器(206)计算第三乘法器(203)和第四乘法器(204)的输出值的和,并计算两个复数('x','y')的乘积的虚数。 选择单元(300)包括在第三乘法器(203)/第四乘法器(204)和加法器(206)之间,用于将第一乘法器(201)和第二乘法器(202)的输出值输入到加法器 (206)在至少一个实数和至少一个虚数相同的情况下。