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    • 3. 发明授权
    • SSB modulator for adjusting the carrier amplitude level of a modulated
SSB signal
    • SSB调制器,用于调整调制SSB信号的载波振幅电平
    • US5506548A
    • 1996-04-09
    • US313878
    • 1994-09-28
    • Shigeki KajimotoWeimin Sun
    • Shigeki KajimotoWeimin Sun
    • H03C1/60H04L27/04
    • H03C1/60
    • A Single-Sideband (SSB) modulator includes:a demultiplexer for successively distributing an A/D converted digital signal x(t) to L sequences x.sub.1 (t.sub.1), x.sub.2 (t.sub.2)... ...x.sub.L (t.sub.L) in accordance with a sampling period t, an adder including L/2 adders for adding constants to x.sub.i (t.sub.i) of the demultiplexer, where i is either an even or an odd number; a phase shift network system comprising L/2 phase shift networks for making a 90-degree phase difference between the outputs of the adder and x.sub.i (t.sub.i) of the demultiplexer; a timing signal generator for generating timing signals expressed by A(-1).sup.(KL)/2+n and/or A(-1).sup.((K-1)L)/2+n in accordance with the sampling period t; a multiplier including L/2 pair of multipliers for multiplying the outputs of the phase shift network system by the outputs of the timing signal generator; a multiplexer for selecting the outputs of the multiplier in accordance with the sampling period t.
    • 单边带(SSB)调制器包括:解复用器,用于依次分配A / D转换的数字信号x(t)到L个序列x1(t1),x2(t2)... ... xL(tL) 具有采样周期t的加法器,包括用于将常数加到解复用器的xi(ti)的L / 2加法器,其中i是偶数或奇数; 相移网络系统,包括用于在加法器的输出和解复用器的xi(ti)之间进行90度相位差的L / 2相移网络; 定时信号发生器,用于根据采样周期t产生由A(-1)(KL)/ 2 + n和/或A(-1)((K-1)L)/ 2 + n表示的定时信号; 乘法器,包括用于将相移网络系统的输出乘以定时信号发生器的输出的L / 2对乘法器; 多路复用器,用于根据采样周期t选择乘法器的输出。
    • 4. 发明授权
    • Digital band pass elliptic filter system
    • 数字带通椭圆滤波系统
    • US5479362A
    • 1995-12-26
    • US322795
    • 1994-10-13
    • Weimin SunShigeki Kajimoto
    • Weimin SunShigeki Kajimoto
    • H03H17/04H03H17/02G06F17/10
    • H03H17/0294
    • The filter coefficients of a digital band pass elliptic filter can be approximated to a linear function of the center frequency of the pass band width. The filter coefficients of a band pass digital filter having a predetermined center frequency and the slope of this linear function are stored in first and second memories. A central processing unit (CPU) obtains the difference between a desired center frequency and a predetermined center frequency. A multiplier multiplies the slope stored in the second memory by the difference obtained by the CPU. An adder adds each of the filter coefficients stored in the first memory to an associated one of the products output from the multiplier. The adding results become the filter coefficients for obtaining the desired center frequency. Those filter coefficients are set in a digital filter.
    • 数字带通椭圆滤波器的滤波器系数可以近似为通带宽度的中心频率的线性函数。 具有预定中心频率的带通数字滤波器的滤波器系数和该线性函数的斜率被存储在第一和第二存储器中。 中央处理单元(CPU)获得期望中心频率和预定中心频率之间的差。 乘法器将存储在第二存储器中的斜率乘以由CPU获得的差值。 加法器将存储在第一存储器中的每个滤波器系数与从乘法器输出的乘积相关联。 加法结果成为获得所需中心频率的滤波器系数。 那些滤波器系数被设置在数字滤波器中。
    • 6. 发明授权
    • Radio communication system
    • 无线通信系统
    • US5555453A
    • 1996-09-10
    • US406661
    • 1995-03-20
    • Shigeki KajimotoWeimin Sun
    • Shigeki KajimotoWeimin Sun
    • H04B1/26H04B1/10H04B1/28H04B1/06H04B7/00
    • H04B1/28
    • A CW (Continuous Wave) radio frequency signal converted to an IF (Intermediate Frequency) signal is mixed with a local oscillator signal by an IF mixer, and the obtained signal is converted to a digital signal by an ADC (Analog-to-Digital Converter). A digital bandpass filter passes only the target component in the output of the ADC. The passed IF signal is demodulated by a digital demodulator, and the demodulated signal is converted to an analog signal before being output as a sound. When pitch control to increase the reception pitch by .DELTA.f is instructed, an MPU (Microprocessor Unit) alters the frequency of the local oscillator signal by .DELTA.f as well as the center frequency of the digital bandpass filter by .DELTA.f, so that the center frequency of the input signal to a narrow-band filter coincides with the center frequency of the digital bandpass filter.
    • 通过IF混频器将转换成IF(中频)信号的CW(连续波)射频信号与本地振荡器信号混合,并且所获得的信号由ADC(模数转换器)转换成数字信号 )。 数字带通滤波器仅通过ADC输出中的目标分量。 通过的IF信号由数字解调器解调,解调后的信号在作为声音输出之前被转换为模拟信号。 指示通过DELTA f增加接收音调的音高控制时,MPU(微处理器单元)通过DELTA f和DELTA f将数字带通滤波器的中心频率改变为本地振荡器信号的频率,使得中心 到窄带滤波器的输入信号的频率与数字带通滤波器的中心频率一致。
    • 7. 发明授权
    • Maintaining linear beamforming weights in communications systems
    • 在通信系统中维持线性波束成形权重
    • US08755475B1
    • 2014-06-17
    • US13411507
    • 2012-03-02
    • Matthew C. BrombergDale A. BranlundWeimin Sun
    • Matthew C. BrombergDale A. BranlundWeimin Sun
    • H03D1/04H03D1/06H03K5/01H03K6/04H04B1/10H04L1/00H04L25/08
    • H04B7/0851H04B7/0617H04B17/345H04L1/0071H04L25/0234H04L25/03H04L25/03949
    • Methods and systems that enhance interference cancellation in communication channels are described. Samples are obtained from stacked carriers in a received signal and a data vector is created from the samples. Stacked carriers are selected using a steering vector received during synchronization of the receiver. The steering vector is calculated to obtain cancellation of interference from another receiver and is calculated based on time domain channel estimation. Specialized time domain training sequences and simple cross correlation are used to obtain a channel estimate for use in stacked carrier beamforming and/or for use in OFDM based spatial beamforming. State space or filter-based modeled interpolators or whitening matrix-filters in the frequency or time domain are used for interpolation of the channels to maintain linear beamforming weights as a function of time or frequency. Space time adaptive processing facilitates beamforming of communications signals for OFDM and 802.16 (WiMax) systems.
    • 描述了在通信信道中增强干扰消除的方法和系统。 在接收信号中从堆叠载波获取样本,并从样本创建数据向量。 使用在接收机同步期间接收到的导向矢量来选择堆叠的载波。 计算导向矢量以获得来自另一接收机的干扰的抵消,并且基于时域信道估计来计算。 使用专用时域训练序列和简单的互相关来获得用于堆叠载波波束成形和/或用于基于OFDM的空间波束形成中的信道估计。 在频率或时域中的状态空间或基于滤波器的建模的内插器或白化矩阵滤波器被用于信道的插值,以维持作为时间或频率的函数的线性波束成形权重。 空时自适应处理有利于OFDM和802.16(WiMax)系统的通信信号的波束成形。