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1.发明申请SYSTEM AND METHOD FOR COMMUNICATING DATA USING EFFICIENT FAST FOURIER TRANSFORM (FFT) FOR ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM) MODULATION 有权用于正交频分多址（OFDM）调制的有效快速傅里叶变换（FFT）通信数据的系统和方法公开(公告)号：US20090245406A1
公开(公告)日：2009-10-01
申请号：US12060283
申请日：2008-04-01
CPC分类号： H04L27/265 , G06F17/142 , H04L27/2628
摘要： A communications device includes at least one memory device for storing complex exponential functions as approximations of sine and cosine basis waveforms. A logic circuit adds and subtracts the complex exponential functions to generate an Orthogonal Frequency Division Multiplexed (OFDM) communications signal as a plurality of N data subcarriers that carry communications data. The logic circuit provides efficient and accurate implementation of the IFFT for use as an OFDM modulator using additions of stored complex exponentials and modulation of the integer-valued QAM data symbols using logic shifts and sign changes (2's complement).
摘要翻译： 通信设备包括至少一个用于存储复数指数函数作为正弦和余弦基波形近似的存储器件。 逻辑电路加上和减去复指数函数以产生正交频分复用（OFDM）通信信号作为携带通信数据的多个N个数据副载波。 逻辑电路提供了IFFT的有效和准确的实现，用于使用存储的复指数的加法和使用逻辑移位和符号变化（2的补码）对整数值QAM数据符号进行调制而用作OFDM调制器。
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2.发明授权System and method for communicating data using efficient fast fourier transform (FFT) for orthogonal frequency division multiplexing (OFDM) modulation 有权用于使用用于正交频分复用（OFDM）调制的有效快速傅立叶变换（FFT）来传送数据的系统和方法公开(公告)号：US08229009B2
公开(公告)日：2012-07-24
申请号：US12060283
申请日：2008-04-01
IPC分类号： H04K1/10
CPC分类号： H04L27/265 , G06F17/142 , H04L27/2628
摘要： A communications device includes at least one memory device for storing complex exponential functions as approximations of sine and cosine basis waveforms. A logic circuit adds and subtracts the complex exponential functions to generate an Orthogonal Frequency Division Multiplexed (OFDM) communications signal as a plurality of N data subcarriers that carry communications data. The logic circuit provides efficient and accurate implementation of the IFFT for use as an OFDM modulator using additions of stored complex exponentials and modulation of the integer-valued QAM data symbols using logic shifts and sign changes (2's complement).
摘要翻译： 通信设备包括至少一个用于存储复数指数函数作为正弦和余弦基波形近似的存储器件。 逻辑电路加上和减去复指数函数以产生正交频分复用（OFDM）通信信号作为携带通信数据的多个N个数据副载波。 逻辑电路提供了IFFT的有效和准确的实现，用于使用存储的复指数的加法和使用逻辑移位和符号变化（2的补码）对整数值QAM数据符号进行调制而用作OFDM调制器。
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3.发明授权System and method for communicating data using efficient fast fourier transform (FFT) for orthogonal frequency division multiplexing (OFDM) 有权用于正交频分复用（OFDM）的高效快速傅里叶变换（FFT）传送数据的系统和方法公开(公告)号：US08274921B2
公开(公告)日：2012-09-25
申请号：US12060292
申请日：2008-04-01
IPC分类号： H04K1/10
CPC分类号： H04L27/2628 , G06F17/142 , H04L27/265
摘要： A system communicates data and includes a transmitter for transmitting a communications signal that carries communications data. It includes an efficient modulator for approximating the frequencies of sine/cosine basis waveforms using complex exponential functions and adding and subtracting the complex exponential functions to generate an Orthogonal Frequency Division Multiplexed (OFDM) communications signal as a plurality of N data subcarriers that carry communications data as data symbols. A receiver receives the OFDM communications signal and includes a demodulation circuit for demodulating the OFDM communications signal using logical shifts of multiples +/−2p based on complex exponential functions corresponding to sine/cosine basis waveform approximations to extract amplitude and phase values from a plurality of N data subcarriers as data symbols within the OFDM communications signal.
摘要翻译： 系统通信数据并包括用于发送携带通信数据的通信信号的发射机。 它包括一个有效的调制器，用于使用复指数函数近似正弦/余弦基波形的频率，并且加上和减去复指数函数以产生正交频分复用（OFDM）通信信号作为携带通信数据的多个N个数据子载波 作为数据符号。 接收机接收OFDM通信信号，并且包括解调电路，用于使用基于与正弦/余弦基波形近似对应的复指数函数的倍数+/- 2p的逻辑移位来解调OFDM通信信号，以从多个 N个数据副载波作为OFDM通信信号内的数据符号。
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4.发明申请SYSTEM AND METHOD FOR COMMUNICATING DATA USING EFFICIENT FAST FOURIER TRANSFORM (FFT) FOR ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM) 有权用于正交频分多址（OFDM）的有效快速傅里叶变换（FFT）通信数据的系统和方法公开(公告)号：US20090245084A1
公开(公告)日：2009-10-01
申请号：US12060292
申请日：2008-04-01
CPC分类号： H04L27/2628 , G06F17/142 , H04L27/265
摘要： A system communicates data and includes a transmitter for transmitting a communications signal that carries communications data. It includes an efficient modulator for approximating the frequencies of sine/cosine basis waveforms using complex exponential functions and adding and subtracting the complex exponential functions to generate an Orthogonal Frequency Division Multiplexed (OFDM) communications signal as a plurality of N data subcarriers that carry communications data as data symbols. A receiver receives the OFDM communications signal and includes a demodulation circuit for demodulating the OFDM communications signal using logical shifts of multiples +/−2p based on complex exponential functions corresponding to sine/cosine basis waveform approximations to extract amplitude and phase values from a plurality of N data subcarriers as data symbols within the OFDM communications signal.
摘要翻译： 系统通信数据并包括用于发送携带通信数据的通信信号的发射机。 它包括一个有效的调制器，用于使用复指数函数近似正弦/余弦基波形的频率，并且加上和减去复指数函数以产生正交频分复用（OFDM）通信信号作为携带通信数据的多个N个数据子载波 作为数据符号。 接收机接收OFDM通信信号，并且包括解调电路，用于使用基于与正弦/余弦基波形近似对应的复指数函数的倍数+/- 2p的逻辑移位来解调OFDM通信信号，以从多个 N个数据副载波作为OFDM通信信号内的数据符号。
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5.发明授权Linearization of RF power amplifiers using an adaptive subband predistorter 有权使用自适应子带预失真器对RF功率放大器进行线性化公开(公告)号：US08019015B2
公开(公告)日：2011-09-13
申请号：US11678847
申请日：2007-02-26
CPC分类号： H03F1/3247 , H03F1/3294 , H03F3/24
摘要： Predistorting an input signal prior to amplification in an RF power amplifier (206) includes isolating a plurality sub-band signals, each representing a portion of the input signal s(t). The method includes independently modifying an amplitude and a phase of each of the plurality of sub-band signals. The modification of the amplitude and/or phase is performed using a set of signal weighting parameters (weights) w and W, controlling linear and nonlinear modifications respectively, which are determined in an adaptive process by an adaptive controller (224). After modification, each of the sub-bands are summed together to obtain a predistorted input signal for an RF power amplifier (206).
摘要翻译： 在RF功率放大器（206）中放大之前预失真输入信号包括隔离多个子带信号，每个子带信号表示输入信号s（t）的一部分。 该方法包括独立地修改多个子带信号中的每一个的振幅和相位。 使用一组信号加权参数（权重）w和W来执行幅度和/或相位的修改，分别控制在自适应控制器（224）的自适应处理中确定的线性和非线性修改。 在修改之后，将每个子带相加在一起以获得用于RF功率放大器（206）的预失真输入信号。
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公开(公告)号：US20080070532A1
公开(公告)日：2008-03-20
申请号：US11532642
申请日：2006-09-18
IPC分类号： H04B17/00
CPC分类号： H04B17/318 , H04B1/56 , H04H60/51
摘要： Method (500) and system (402) for actively detecting and determining a range of a remotely located radio receiver (100). The invention also provides a method and system to determine whether a remote receiver (100) is receiving a transmitted signal (418) and the minimum necessary transmitter power required to establish a communication link to the receiver (100). Finally, the invention also provides a method and system to resolve directional ambiguities due to multipath.
摘要翻译： 用于主动地检测和确定远程位置的无线电接收机（100）的范围的方法（500）和系统（402）。 本发明还提供一种方法和系统，用于确定远程接收机（100）是否正在接收发射信号（418）和建立到接收机（100）的通信链路所需的最小必需发射机功率。 最后，本发明还提供了解决由于多路径导致的定向模糊性的方法和系统。
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7.发明申请System and Method for Communicating Data Using Symbol-Based Randomized Orthogonal Frequency Division Multiplexing (OFDM) With Applied Frequency Domain Spreading 有权使用基于符号的随机正交频分复用（OFDM）与应用频域扩展通信数据的系统和方法公开(公告)号：US20080043812A1
公开(公告)日：2008-02-21
申请号：US11464854
申请日：2006-08-16
CPC分类号： H04L27/2608 , H04B1/707
摘要： A device and system communicates data and includes a modulation and mapping circuit that modulates and maps data symbols into a plurality of multiple subcarrier frequencies that are orthogonal to each other to form an Orthogonal Frequency Division Multiplexed (OFDM) communications signal based on a fixed or variable OFDM symbol rate. A pseudo-random signal generator operative with the modulation and mapping circuit generates pseudo-random signals to the modulation and mapping circuit based on an encryption algorithm for frequency hopping each subcarrier at an OFDM symbol rate to lower any probability of interception and detection, reduce power per frequency (dB/Hz/sec), and lower any required transmission power while maintaining an instantaneous signal-to-noise ratio A frequency domain spreader circuit is operatively connected to the modulation and mapping circuit for spreading the multiple subcarriers over the frequency domain.
摘要翻译： 一种设备和系统通信数据，并且包括调制和映射电路，其调制和映射数据符号到彼此正交的多个多个子载波频率，以形成基于固定或可变的正交频分复用（OFDM）通信信号 OFDM符号率。 与调制和映射电路一起操作的伪随机信号发生器基于用于以OFDM符号速率跳频每个子载波的加密算法向调制和映射电路生成伪随机信号，以降低任何拦截和检测的概率，降低功率 每个频率（dB / Hz /秒），并且在保持瞬时信噪比的同时降低任何所需的发射功率。频域扩展电路可操作地连接到调制和映射电路，用于在频域上扩展多个子载波。
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8.发明授权System and method for communicating data using efficient fast fourier transform (FFT) for orthogonal frequency division multiplexing (OFDM) demodulation 有权用于使用用于正交频分复用（OFDM）解调的有效快速傅里叶变换（FFT）来传送数据的系统和方法公开(公告)号：US08238454B2
公开(公告)日：2012-08-07
申请号：US12060311
申请日：2008-04-01
IPC分类号： H04K1/10
CPC分类号： H04L27/2628 , G06F17/142 , H04L27/265
摘要： A communications device includes a signal input that receives an orthogonal frequency division multiplexed (OFDM) communications signal. A demodulator is connected to the signal input for receiving the OFDM communications signal and demodulating the OFDM communication signal. It includes at least one memory element for storing the at least one sine/cosine basis waveform approximation as complex exponential functions. A logic circuit performs logical shifts in additions and multiples of +/−2n and extracts amplitude and phase values from a plurality of N data subcarriers within the OFDM communications signal. The demodulator includes efficient implementation of the FFT for use as an OFDM demodulator where the complex exponentials are approximated by multi-level complex sinusoids and optionally oversampled to increase SNR of the FFT output.
摘要翻译： 通信设备包括接收正交频分复用（OFDM）通信信号的信号输入。 解调器连接到信号输入端，用于接收OFDM通信信号并解调OFDM通信信号。 它包括用于将至少一个正弦/余弦基波形近似作为复指数函数存储的至少一个存储元件。 逻辑电路在+/- 2n的相加和倍数中执行逻辑移位，并从OFDM通信信号内的多个N个数据子载波中提取振幅和相位值。 解调器包括用于OFDM解调器的FFT的有效实施，其中复指数由多电平复数正弦曲线近似，并且可选地过采样以增加FFT输出的SNR。
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公开(公告)号：US20110129023A1
公开(公告)日：2011-06-02
申请号：US12629584
申请日：2009-12-02
IPC分类号： H04L27/28
CPC分类号： H04L27/2613
摘要： A wireless ranging system for determining a range of a remote wireless device may include a wireless transmitter and a wireless receiver. The wireless ranging system may also include a ranging controller to cooperate with the wireless transmitter and receiver to generate a multi-carrier base waveform, transmit a sounder waveform to the remote wireless device including concatenated copies of the multi-carrier base waveform, and receive a return waveform from the remote wireless device in response to the sounder waveform. The ranging controller may also generate time domain samples from the return waveform, convert the time domain samples into frequency domain data, and process the frequency domain data to determine the range of the remote wireless device.
摘要翻译： 用于确定远程无线设备的范围的无线测距系统可以包括无线发射机和无线接收机。 无线测距系统还可以包括测距控制器，以与无线发射机和接收机协作以产生多载波基波形，向远程无线设备发送包括多载波基波形的级联副本的发声器波形，并且接收 响应于发声器波形从远程无线设备返回波形。 测距控制器还可以从返回波形生成时域采样，将时域采样转换成频域数据，并处理频域数据以确定远程无线设备的范围。
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公开(公告)号：US07642850B2
公开(公告)日：2010-01-05
申请号：US12061013
申请日：2008-04-02
IPC分类号： H03F1/26
CPC分类号： H03F1/3229
摘要： RF amplifier system (200) incorporating feedforward linearization. The system includes a digital waveform source (202) generating digital data s(t) representative of at least one analog signal. The system also includes a feedforward linearization circuit for reducing a distortion of an RF power amplifier (212). The feedforward linearization circuit includes a differential amplifier (230) arranged for generating an error signal. The error signal is determined based on a difference between the distorted RF output signal and an analog RF reference signal (229) generated from the digital data.
摘要翻译： RF放大器系统（200）包含前馈线性化。 该系统包括产生代表至少一个模拟信号的数字数据s（t）的数字波形源（202）。 该系统还包括用于减少RF功率放大器（212）的失真的前馈线性化电路。 前馈线性化电路包括布置成用于产生误差信号的差分放大器（230）。 基于从数字数据产生的失真的RF输出信号和模拟RF参考信号（229）之间的差异来确定误差信号。
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