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426 条记录 (耗时 0.034 秒)

    Lower complexity layered modulation signal processor
    61.
    发明授权
    Lower complexity layered modulation signal processor 有权
    较低复杂度的分层调制信号处理器

    公开(公告)号：US07512189B2

    公开(公告)日：2009-03-31

    申请号：US10532632

    申请日：2003-10-10

    申请人： Ernest C. Chen ,  Weizheng W. Wang ,  Guangcai Zhou ,  Tung-Sheng Lin ,  Joseph Santoru

    发明人： Ernest C. Chen ,  Weizheng W. Wang ,  Guangcai Zhou ,  Tung-Sheng Lin ,  Joseph Santoru

    IPC分类号： H04L27/00

    CPC分类号： H04L27/3488 ,  H04B7/18515 ,  H04B17/318 ,  H04L1/20 ,  H04L27/183 ,  H04L27/227 ,  H04L27/366 ,  H04L2027/0061

    摘要： A method and apparatus for transmitting and receiving a coded signal having an upper layer signal and a lower layer signal is disclosed. The method comprises the steps of combining the upper layer signal and the lower layer signal, encoding the combined upper layer signal and lower layer signal, delaying the upper layer signal, modulating the delayed upper layer signal, modulating the lower layer signal, transmitting the delayed upper layer signal and transmitting the lower layer signal. The apparatus comprises an encoder, for encoding a combined upper layer signal and lower layer signal, a delay, communicatively coupled to the encoder, for delaying the upper layer signal, a first modulator, for modulating the delayed upper layer signal, a second modulator, for modulating the lower layer signal, a transmitter, communicatively coupled to the first modulator, for transmitting the delayed upper layer signal, and a second transmitter, communicatively coupled to the second modulator.

    摘要翻译： 公开了一种用于发送和接收具有上层信号和下层信号的编码信号的方法和装置。 该方法包括以下步骤：组合上层信号和下层信号，编码组合上层信号和下层信号，延迟上层信号，调制延迟的上层信号，调制下层信号，发送延迟的 上层信号并传输下层信号。 该装置包括用于编码组合的上层信号和下层信号的编码器，通信地耦合到编码器的用于延迟上层信号的延迟，用于调制延迟的上层信号的第一调制器，第二调制器， 用于调制下层信号的发射机，通信地耦合到第一调制器，用于发送延迟的上层信号;以及第二发射机，通信地耦合到第二调制器。

    Transmission circuit and communication apparatus employing the same
    63.
    发明申请
    Transmission circuit and communication apparatus employing the same 有权
    发送电路及采用该电路的通信装置

    公开(公告)号：US20070129032A1

    公开(公告)日：2007-06-07

    申请号：US11605343

    申请日：2006-11-29

    申请人： Toru Matsuura ,  Shigeru Morimoto

    发明人： Toru Matsuura ,  Shigeru Morimoto

    IPC分类号： H04B1/02 ,  H04B1/04 ,  H01Q11/12

    CPC分类号： H04L27/366 ,  H04L27/361

    摘要： A transmission circuit is provided which can output a stable transmission signal independently of the temperature characteristics of an amplitude modulating section. A signal generating section generates an amplitude signal and a phase signal. A regulator supplies a voltage which is controlled, depending on the amplitude signal, to the amplitude modulating section. An angle modulating section subjects the phase signal to angle modulation to output an angle-modulated signal. A temperature detecting section outputs temperature information of the amplitude modulating section. A gain control section controls a gain of a variable gain amplifier based on the temperature information of the amplitude modulating section. The variable gain amplifier amplifies the angle-modulated signal using the gain controlled by the gain control section. The amplitude modulating section subjects the angle-modulated signal to amplitude modulation using a voltage which is controlled, depending on the amplitude signal, to output an amplitude-modulated signal.

    摘要翻译： 提供一种传输电路，其能够独立于幅度调制部分的温度特性输出稳定的传输信号。 信号生成部生成振幅信号和相位信号。 调节器根据幅度信号向幅度调制部分提供被控制的电压。 角度调制部使相位信号进行角度调制以输出角度调制信号。 温度检测部输出振幅调制部的温度信息。 增益控制部根据振幅调制部的温度信息来控制可变增益放大器的增益。 可变增益放大器使用由增益控制部分控制的增益来放大角度调制信号。 幅度调制部分使用根据振幅信号被控制的电压来使角度调制信号进行幅度调制，以输出幅度调制信号。

    Combining frequency multiplication and modulation
    65.
    发明授权
    Combining frequency multiplication and modulation 有权

    公开(公告)号：US07136425B2

    公开(公告)日：2006-11-14

    申请号：US09871294

    申请日：2001-05-31

    申请人： Med A. Nation

    发明人： Med A. Nation

    IPC分类号： H04L27/04 ,  H04L27/36

    CPC分类号： H04L27/366

    摘要： A technique includes generating a first signal that has a fundamental frequency and modulating an input signal with the first signal. The modulation is tuned to a harmonic of the fundamental frequency to produce a modulated signal that has a carrier frequency near the harmonic.

    Method for peak power reduction in spread spectrum communications systems
    67.
    发明授权
    Method for peak power reduction in spread spectrum communications systems 有权

    公开(公告)号：US07003017B2

    公开(公告)日：2006-02-21

    申请号：US10200399

    申请日：2002-07-22

    申请人： Matthew J. Hunton

    发明人： Matthew J. Hunton

    IPC分类号： H04B1/707

    CPC分类号： H04L25/03343 ,  H04B1/707 ,  H04B2201/70706 ,  H04L27/2614 ,  H04L27/2621 ,  H04L27/366

    摘要： A system and method for signal peak reduction in a spread spectrum communication system of the type including a filter for limiting signal bandwidth of symbols transmitted from the system. A signal peak reduction unit is provided before the filter that includes a filter predictor that predicts the effect of the filter on input symbols by using filter coefficient values corresponding to the filter impulse response function. Input symbols that are predicted to cause the output signal to exceed a predetermined peak limit value are adjusted. Several examples of suitable algorithms for calculating the necessary peak reduction to be applied to the input symbols are disclosed. The peak reduction unit provides adjusted symbols to the filter for processing and communication system output.

    Signal, interference and noise power measurement
    68.
    发明申请
    Signal, interference and noise power measurement 有权
    信号，干扰和噪声功率测量

    公开(公告)号：US20030219069A1

    公开(公告)日：2003-11-27

    申请号：US10236414

    申请日：2002-09-06

    发明人： Ernest C. Chen ,  Chinh Tran

    IPC分类号： H04Q001/20 ,  H04B003/46 ,  H04L001/00

    CPC分类号： H04B7/18515 ,  H04B7/1851 ,  H04B7/18526 ,  H04B17/318 ,  H04L1/20 ,  H04L1/206 ,  H04L1/208 ,  H04L27/183 ,  H04L27/227 ,  H04L27/366 ,  H04L2027/0061

    摘要： Systems and methods are presented for measuring power levels of primary and interfering signals as well as noise, particularly for satellite transmitted signals. A typical method comprises the steps of receiving a signal comprising a primary signal, an interference signal and noise, demodulating the primary signal to remove a carrier frequency, decoding the primary signal to obtain symbols, estimating a power level of the primary signal based upon the demodulated and decoded primary signal. Additionally, an ideal primary signal can be generated from the carrier power and frequency and the symbols and subtracted from the received signal to produce the noise and interference signal. The noise and interference power is then estimated from the noise and interference signal.

    摘要翻译： 提出了系统和方法，用于测量主要和干扰信号的功率水平以及噪声，特别是卫星发射信号的噪声。 典型的方法包括以下步骤：接收包括主信号，干扰信号和噪声的信号，解调主信号以去除载波频率，解码主信号以获得符号，基于该信号估计主信号的功率电平 解调和解码的主信号。 此外，理想的主信号可以从载波功率和频率以及符号生成，并从接收信号中减去产生噪声和干扰信号。 然后从噪声和干扰信号估计噪声和干扰功率。

    Method for peak power reduction in spread spectrum communications systems
    70.
    发明申请
    Method for peak power reduction in spread spectrum communications systems 有权
    扩频通信系统中峰值功率降低的方法

    公开(公告)号：US20020196839A1

    公开(公告)日：2002-12-26

    申请号：US10200399

    申请日：2002-07-22

    发明人： Matthew J. Hunton

    IPC分类号： H04B001/69

    CPC分类号： H04L25/03343 ,  H04B1/707 ,  H04B2201/70706 ,  H04L27/2614 ,  H04L27/2621 ,  H04L27/366

    摘要： A system and method for signal peak reduction in a spread spectrum communication system of the type including a filter for limiting signal bandwidth of symbols transmitted from the system. A signal peak reduction unit is provided before the filter that includes a filter predictor that predicts the effect of the filter on input symbols by using filter coefficient values corresponding to the filter impulse response function. Input symbols that are predicted to cause the output signal to exceed a predetermined peak limit value are adjusted. Several examples of suitable algorithms for calculating the necessary peak reduction to be applied to the input symbols are disclosed. The peak reduction unit provides adjusted symbols to the filter for processing and communication system output.

    摘要翻译： 一种包括用于限制从系统发送的符号的信号带宽的滤波器的类型的扩频通信系统中的信号峰值降低的系统和方法。 在包括通过使用对应于滤波器脉冲响应函数的滤波器系数值来预测滤波器对输入符号的影响的滤波器预测器的滤波器之前提供信号峰值降低单元。 调整预测使输出信号超过规定的峰值极限值的输入符号。 公开了用于计算要应用于输入符号的必要峰值减小的适当算法的几个示例。 峰值降低单元为滤波器提供经调整的符号，用于处理和通信系统输出。