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    • 52. 发明申请
    • DATA MODULATOR BASED ON GMSK MODULATION AND DATA TRANSMITTER INCLUDING THE SAME
    • 基于GMSK调制和数据发送器的数据调制器,包括它们
    • US20080013643A1
    • 2008-01-17
    • US11687699
    • 2007-03-19
    • Dong-Won Lee
    • Dong-Won Lee
    • H04L27/10
    • H04L27/2017H04L25/03834
    • A data modular based on Gaussian minimum shift keying (GMSK) modulation and a data transmitter including the same in which the data modulator includes a read-only memory (ROM) table storing GMSK modulation data with respect to information bits; a low-pass filter filtering first GMSK modulation data, which is output from the ROM table based on a predetermined input bitstream, and outputting second GMSK modulation data; and a multiplexer selecting and outputting the first GMSK modulation data or the second GMSK modulation data based on a predetermined control signal. The data modulator selectively filters a GMSK modulation signal according to a channel state, thereby effectively controlling trade-off between inter-symbol interference and adjacent channel interference according the channel state.
    • 基于高斯最小移位键控(GMSK)调制的数据模块和包括数据调制器的数据发送器,其中数据调制器包括相对于信息位存储GMSK调制数据的只读存储器(ROM)表; 滤波第一GMSK调制数据的低通滤波器,其基于预定的输入比特流从ROM表输出,并输出第二GMSK调制数据; 以及多路复用器,基于预定的控制信号选择和输出第一GMSK调制数据或第二GMSK调制数据。 数据调制器根据信道状态选择性地滤波GMSK调制信号,从而根据信道状态有效地控制符号间干扰和相邻信道干扰之间的权衡。
    • 60. 发明授权
    • Active constant power supply apparatus
    • 主动恒电源装置
    • US08710756B2
    • 2014-04-29
    • US13255733
    • 2010-03-08
    • Dong-Won Lee
    • Dong-Won Lee
    • H05B37/02H05B39/04H05B41/36
    • H05B33/0815H02M1/4225H02M2001/0012H02M2003/1586Y02B70/126
    • Disclosed is an active constant power supply apparatus, which rectifies power having various intensities and frequencies without using a high capacity condenser for a smoothing circuit which degrades the power factor of a circuit, and supplies constant power to a load. The active constant power supply apparatus includes an AC power supplier for supplying AC power; a rectifying circuit which receives AC power from the AC power supply unit and rectifies the received power; a driving coil connected in series to the load receiving power from the rectifying circuit; a power switch which switches the current passing through the driving coil and the load on/off; a pulse-type driving signal generator connected to a gate terminal of the power switch to control the switching on/off operation of the power switch; a turn-off decider which generates a turn-off signal when the current flowing along the driving coil has a value higher than the designed value, so as to turn off the power switch; and a pulse width controller which measures the control period ranging from the switch-on time of the driving signal generator to the switch-off time of the turn-off decider, and controls the driving pulse width of the driving signal generator such that the driving pulse width coincides with the control period.
    • 公开了一种有源恒定电源装置,其对具有各种强度和频率的功率进行整流,而不使用用于平滑电路的高容量电容器,其降低电路的功率因数,并向负载提供恒定功率。 有源恒定电源装置包括用于提供AC电力的AC电源; 整流电路,从交流电源单元接收交流电力,对接收的功率进行整流; 与来自整流电路的负载接收功率串联的驱动线圈; 电源开关,其切换通过驱动线圈的电流和负载的开/关; 连接到电源开关的栅极端子的脉冲型驱动信号发生器,以控制电源开关的接通/断开操作; 当沿着驱动线圈流动的电流具有高于设计值的值时产生关断信号的关断判定器,以便关断电源开关; 以及脉冲宽度控制器,其测量从驱动信号发生器的接通时间到关断判定器的关断时间的控制周期,并且控制驱动信号发生器的驱动脉冲宽度,使得驱动 脉冲宽度与控制周期一致。