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    • 3. 发明授权
    • Method and system for clipping a baseband input signal
    • 用于削波基带输入信号的方法和系统
    • US08150324B2
    • 2012-04-03
    • US11502446
    • 2006-08-11
    • Bjoern JelonnekGunter Wolff
    • Bjoern JelonnekGunter Wolff
    • H04B1/00
    • H03F1/32H03F1/3241H03F1/3258H04L27/2623
    • A method for clipping a baseband input signal filters the complex baseband input signal with a function H1 for forming a filtered first signal. To form a clipped signal in the baseband the filtered first signal is multiplied by a scaling factor. By a signal analysis of the filtered first signal signal overshoots are predicted from which the scaling factor is determined for the baseband clipping. The filter function H1 is calculated as the quotient from a frequency response HS of a transmission filter used one the one hand and from an error frequency response HF on the other hand, with the error frequency response HF being determined in such a way that the error spectrally shaped with HF, which arises for the limitation of the baseband signal, a frequency-dependent tolerance is not exceeded. Subsequently the clipped signal is filtered with the error frequency response HF for forming a filtered second signal.
    • 用于削波基带输入信号的方法用功能H1对复数基带输入信号进行滤波,以形成滤波后的第一信号。 为了在基带中形成限幅信号,滤波后的第一信号乘以比例因子。 通过对经过滤波的第一信号信号的信号分析,预测基准限幅的比例因子。 滤波器功能H1被计算为来自一方使用的发送滤波器的频率响应HS和来自错误频率响应HF的商,另一方面,误差频率响应HF被确定为使得错误 用HF限制频谱成形,不会超过频率相关容差。 随后,用用于形成滤波后的第二信号的误差频率响应HF对限幅信号进行滤波。
    • 4. 发明申请
    • In-Band Ripple Compensation
    • 带内纹波补偿
    • US20110150127A1
    • 2011-06-23
    • US13060563
    • 2009-08-19
    • Stefano CalabroBjoern JelonnekGunter Wolff
    • Stefano CalabroBjoern JelonnekGunter Wolff
    • H04L25/08H04L27/00
    • H04L27/2627H04L25/03878H04L25/03885H04L27/2634H04L27/2649H04L27/366H04L27/367
    • It is described a technique to compensate the in-band ripple of filters at the IFFT prior to filtering in the transmitter or, for the receiver, in the FFT after filtering. A transmitter, includes a multiplier for multiplying at least one transmitter coefficient to an input signal of an inverse Fourier transformer which is followed subsequent signal processing chain thereby reducing a ripple on the output of said signal processing chain. A receiver for receiving a transmission signal includes a signal processing chain for processing the transmission signal a multiplier for multiplying at least one receiver coefficient to an output signal of a Fourier transformer to which the output of the signal processing chain is fed to thereby reduce a ripple on said output signal of said Fourier transformer.
    • 描述了在滤波之前在发射机或对于接收机进行滤波之前,在IFFT处对滤波器的带内纹波进行补偿的技术。 发射机包括乘法器,用于将至少一个发射机系数与逆傅立叶变换器的输入信号相乘,后者是随后的信号处理链,从而减少所述信号处理链的输出上的纹波。 用于接收传输信号的接收机包括用于处理传输信号的信号处理链,用于将至少一个接收机系数与信号处理链的输出馈送到的傅里叶变换器的输出信号相乘的乘法器,从而减少纹波 在所述傅里叶变换器的所述输出信号上。
    • 6. 发明申请
    • Method and system for clipping a baseband input signal
    • 用于削波基带输入信号的方法和系统
    • US20070036251A1
    • 2007-02-15
    • US11502446
    • 2006-08-11
    • Bjoern JelonnekGunter Wolff
    • Bjoern JelonnekGunter Wolff
    • H04B1/10
    • H03F1/32H03F1/3241H03F1/3258H04L27/2623
    • A method for clipping a baseband input signal filters the complex baseband input signal with a function H1 for forming a filtered first signal. To form a clipped signal in the baseband the filtered first signal is multiplied by a scaling factor. By a signal analysis of the filtered first signal signal overshoots are predicted from which the scaling factor is determined for the baseband clipping. The filter function H1 is calculated as the quotient from a frequency response HS of a transmission filter used one the one hand and from an error frequency response HF on the other hand, with the error frequency response HF being determined in such a way that the error spectrally shaped with HF, which arises for the limitation of the baseband signal, a frequency-dependent tolerance is not exceeded. Subsequently the clipped signal is filtered with the error frequency response HF for forming a filtered second signal.
    • 用于削波基带输入信号的方法用功能H 1 1滤波复基带输入信号,以形成滤波后的第一信号。 为了在基带中形成限幅信号,滤波后的第一信号乘以比例因子。 通过对经过滤波的第一信号信号的信号分析,预测基准限幅的比例因子。 滤波器功能H 1被计算为从一方使用的发送滤波器的频率响应H S S的商和从错误频率响应H F 另一方面,以错误频率响应H> F被确定为以H error error error rally the the the limitation limitation limitation limitation limitation limitation limitation limitation limitation limitation limitation limitation limitation limitation limitation limitation limitation 的基带信号,不超过频率相关容差。 随后,用用于形成滤波后的第二信号的误差频率响应H滤波该限幅信号。
    • 8. 发明授权
    • Sigma-delta-d/a-converter
    • Sigma-delta-d / a转换器
    • US06255977B1
    • 2001-07-03
    • US09600845
    • 2000-09-05
    • Bjoern JelonnekDetlev Nyenhuis
    • Bjoern JelonnekDetlev Nyenhuis
    • H03M300
    • H03M7/3022H03M7/3042
    • The present invention is directed to a sigma-delta D-A converter (300) with N stages, in which the nth stage, where n=1, 2, 3 . . . N, comprises a first adder (10) which adds a use signal x(k) (12) with an error signal errn(k−1) to an input signal en(k) (14), a quantizer (16) which quantizes the input signal en(k) (14) to an output signal yn(k) (18) according to a predetermined quantization function, and a second adder (20) which adds the input signal en(k) (14) with the inverted output signal yn(k) to xn(k) (21), and supplies it to a delay device (22) which sends the signal xn(k) (21) to the first adder (10) as an error signal errn(k−1) with a delay by a clock period. For this purpose, an amount reducer (24) is provided between the second adder (20) and the delay device (22), which amount reducer (24) leaves the signal xn(k) (21) unchanged when xn(k)=0 and otherwise lowers the amount |xn(k)| of the signal xn(k) (21) by at least a smallest representable numerical unit, wherein the quantization function of the quantizer (16) of the nth stage of the sigma-delta D-A converter (300) is expressed as follows: y n ⁡ ( k ) = { 2 ( 1 - n ) , if ⁢   ⁢ e n ⁡ ( k ) > 2 - n 0 , if ⁢   ⁢ abs ⁢   ⁢ ( e n ⁡ ( k ) ) ≤ 2 - n - 2 ( 1 - n ) , if ⁢   ⁢ e n ⁡ ( k )
    • 本发明涉及一种具有N级的Σ-ΔD-A转换器(300),其中n = 1,2,3。 。 。 N包括将使用信号x(k)(12)与误差信号errn(k-1)相加到输入信号en(k)(14)的第一加法器(10),量化器(16) 根据预定量化函数将输入信号en(k)(14)输出到输出信号yn(k)(18);以及第二加法器(20),其将输入信号en(k)(14)与反相 输出信号yn(k)到xn(k)(21),并将其提供给向第一加法器(10)发送信号xn(k)(21)的延迟装置22作为误差信号errn(k -1)延迟一个时钟周期。 为此,在第二加法器(20)和延迟装置(22)之间设置数量减少器(24),当xn(k)= 2时,减法器(24)离开信号xn(k)(21) 0,否则降低量| xn(k)| 信号xn(k)(21)的至少最小可表示数值单位,其中Σ-ΔD-A转换器(300)的第n级的量化器(16)的量化函数表示如下: