公开(公告)号：US20110129023A1

公开(公告)日：2011-06-02

申请号：US12629584

申请日：2009-12-02

Applicant: John E. HOFFMANN ,  Carlos G. Abascal ,  Christopher D. Moffatt

Inventor： John E. HOFFMANN ,  Carlos G. Abascal ,  Christopher D. Moffatt

IPC: H04L27/28

CPC classification number: H04L27/2613

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US08160165B2

公开(公告)日：2012-04-17

申请号：US12242976

申请日：2008-10-01

Applicant: Christopher D. Moffatt ,  John E. Hoffmann

Inventor： Christopher D. Moffatt ,  John E. Hoffmann

IPC: H04K1/10

CPC classification number: H04L27/2602 ,  H04L5/0007

Abstract: A communications device includes communication data and a training sequence corresponding to a preamble. A modulation and mapping circuit modulates the communications data and training sequence into a plurality of multiple subcarriers that are orthogonal to each other to form an OFDM communications signal having modulated subcarriers carrying the communications data forming a data payload and modulated subcarriers forming the preamble. A pseudo-random signal generator is operative with the modulation and mapping circuit and generates pseudo-random signals based on an encryption algorithm for frequency hopping each subcarrier at an OFDM symbol rate. The modulation and mapping circuit applies a quadratic modulation to the subcarriers carrying the training sequences to produce a low peak-to-average power ratio (PAPR) preamble with a PAPR value of approximately 2.6 decibels (dB).

Abstract translation: 通信设备包括对应于前同步码的通信数据和训练序列。 调制和映射电路将通信数据和训练序列调制成彼此正交的多个多个子载波，以形成具有承载形成数据有效载荷的通信数据的调制子载波和形成前导码的调制子载波的OFDM通信信号。 伪随机信号发生器与调制和映射电路一起工作，并且基于用于以OFDM符号速率跳频每个子载波的加密算法产生伪随机信号。 调制和映射电路对携带训练序列的子载波应用二次调制以产生具有大约2.6分贝（dB）的PAPR值的低峰均功率比（PAPR）前导码。

公开(公告)号：US08619908B2

公开(公告)日：2013-12-31

申请号：US12629584

申请日：2009-12-02

Applicant: John E. Hoffmann ,  Carlos G. Abascal ,  Christopher D. Moffatt

Inventor： John E. Hoffmann ,  Carlos G. Abascal ,  Christopher D. Moffatt

IPC: H04L27/00

CPC classification number: H04L27/2613

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US08189697B2

公开(公告)日：2012-05-29

申请号：US12242967

申请日：2008-10-01

Applicant: Christopher D. Moffatt ,  John E. Hoffmann

Inventor： Christopher D. Moffatt ,  John E. Hoffmann

IPC: H04K1/10 ,  H04B1/00

CPC classification number: H04L27/2613 ,  H04L25/022 ,  H04L27/2618 ,  H04L27/262 ,  H04L27/2647

Abstract: A communications device includes a demapping and demodulation circuit that demaps and demodulates an OFDM communications signal as modulated subcarriers carrying communications data and modulated subcarriers carrying a training sequence forming a preamble that includes a long sync sequence for channel and frequency offset estimation having a extended guard interval (GI). The OFDM subcarriers carrying the training sequence have a quadratic modulation to produce a low peak-to-average power (PAPR) preamble with PAPR of approximately 2.6 decibels (dB). A channel estimate circuit is positioned to receive signals after processing within a FFT circuit and subcarrier demapper circuit and estimates the channel characteristics of the communications channel based on splitting the extended guard interval from the long sync sequence and processing into values that represent the low PAPR preamble as plus or minus one (+/−1) values in a real or imaginary component as adds and subtracts.

Abstract translation: 通信设备包括解映射和解调电路，其将OFDM通信信号解映射和调制，作为承载通信数据的调制副载波，以及承载具有形成前导码的训练序列的调制副载波，该前同步码包括用于信道和频偏估计的长同步序列，所述长同步序列具有扩展的保护间隔 （GI）。 承载训练序列的OFDM子载波具有二次调制以产生具有大约2.6分贝（dB）的PAPR的低峰值平均功率（PAPR）前导码。 信道估计电路被定位成在FFT电路和子载波解映射器电路中处理之后接收信号，并且基于从长同步序列分割扩展保护间隔并将处理分解为表示低PAPR前导码的值来估计通信信道的信道特性 作为加或减一个实数或虚分量的正或负一（+/- 1）值。

公开(公告)号：US08175178B2

公开(公告)日：2012-05-08

申请号：US12242958

申请日：2008-10-01

Applicant: Christopher D. Moffatt ,  John E. Hoffmann

Inventor： Christopher D. Moffatt ,  John E. Hoffmann

IPC: H04K1/10 ,  H04L27/00

CPC classification number: H04L27/262 ,  H04L27/2613 ,  H04L27/2618

Abstract: A communications device includes communications data and a training sequence corresponding to a preamble. A modulation and mapping circuit modulates the communications data and training sequence into a plurality of multiple subcarriers that are orthogonal to each other to form an OFDM communication signal having modulated subcarriers carrying the communications data forming a data payload and modulated subcarriers forming the preamble. A circuit turns OFF and ON selected subcarriers based on an encryption algorithm to increase transmit power and signal-to-noise ratio and reduce the Inter-Carrier Interference (ICI). The modulation and mapping circuit applies a quadratic modulation to the subcarriers carrying the training sequences to produce a low peak-to-average power ratio (PAPR) preamble with a PAPR value of approximately 2.6 decibels (dB).

Abstract translation: 通信设备包括对应于前同步码的通信数据和训练序列。 调制和映射电路将通信数据和训练序列调制成彼此正交的多个多个子载波，以形成具有承载形成数据有效载荷的通信数据的调制子载波和形成前导码的调制副载波的OFDM通信信号。 基于加密算法，电路断开和接通选择的子载波，以增加发射功率和信噪比，并减少载波间干扰（ICI）。 调制和映射电路对携带训练序列的子载波应用二次调制以产生具有大约2.6分贝（dB）的PAPR值的低峰均功率比（PAPR）前导码。

公开(公告)号：US08165232B2

公开(公告)日：2012-04-24

申请号：US12242952

申请日：2008-10-01

Applicant: Christopher D. Moffatt ,  John E. Hoffmann

Inventor： Christopher D. Moffatt ,  John E. Hoffmann

IPC: H04K1/10

CPC classification number: H04L27/2613 ,  H04L27/262

Abstract: A communications device includes communications data and a training sequence corresponding to a preamble. A modulation and mapping circuit modulates the communications data and training sequence into a plurality of multiple subcarriers that are orthogonal to each other to form an orthogonal frequency division multiplexing (OFDM) communications signal having modulated subcarriers carrying the communications data forming a data payload and modulated subcarriers forming the preamble. The modulation and mapping circuit applies a quadratic modulation to the subcarriers carrying the training sequences to produce a low peak-to-average power (PAPR) preamble of approximately 2.6 decibels (dB) independent of the number of subcarriers.

Abstract translation: 通信设备包括对应于前同步码的通信数据和训练序列。 调制和映射电路将通信数据和训练序列调制成彼此正交的多个多个子载波，以形成具有承载构成数据有效载荷的通信数据和调制子载波的调制子载波的正交频分复用（OFDM）通信信号 形成序言。 调制和映射电路对携带训练序列的子载波应用二次调制，以产生与子载波数无关的大约2.6分贝（dB）的低峰均功率（PAPR）前导码。

公开(公告)号：US08160166B2

公开(公告)日：2012-04-17

申请号：US12242989

申请日：2008-10-01

Applicant: Christopher D. Moffatt ,  John E. Hoffmann

Inventor： Christopher D. Moffatt ,  John E. Hoffmann

IPC: H04K1/10

CPC classification number: H04B1/713 ,  H04L25/022 ,  H04L27/2618 ,  H04L27/262 ,  H04L27/2647

Abstract: A communications device includes a demapping and demodulation circuit and processes an OFDM communications signal that includes modulated subcarriers carrying communications data forming a data payload and modulated subcarriers carrying a training sequence forming a preamble. Those OFDM subcarriers carrying the training sequence have a sample for each subcarrier at a frequency bin using evenly spaced, equal amplitude subcarriers that have a set phase of each sinusoid to a specific angle with quadratic phase to form a low peak-to-average power ratio (PAPR) preamble with about a PAPR value of 2.6 decibels (dB). A channel estimate circuit is operative for measuring fluctuations within a flat-top spectrum of the received OFDM communications signal corresponding to the preamble to reflect the frequency response of the communications channel.

Abstract translation: 通信设备包括解映射和解调电路，并且处理OFDM通信信号，该OFDM通信信号包括携带形成数据有效载荷的通信数据的调制副载波以及承载构成前导码的训练序列的调制子载波。 携带训练序列的那些OFDM子载波在频率仓上使用均匀间隔的等幅子载波上的每个子载波的样本，其具有每个正弦曲线的设定相位与二次相位的特定角度以形成低峰值与平均功率比 （PAPR）前导码，其PAPR值约为2.6分贝（dB）。 信道估计电路用于测量对应于前导码的接收的OFDM通信信号的平顶频谱内的波动，以反映通信信道的频率响应。

公开(公告)号：US08229009B2

公开(公告)日：2012-07-24

申请号：US12060283

申请日：2008-04-01

Applicant: Christopher D. Moffatt ,  Anders Mattsson ,  John W. Pajunen

Inventor： Christopher D. Moffatt ,  Anders Mattsson ,  John W. Pajunen

IPC: H04K1/10

CPC classification number: H04L27/265 ,  G06F17/142 ,  H04L27/2628

Abstract: 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).

Abstract translation: 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。

公开(公告)号：US08019015B2

公开(公告)日：2011-09-13

申请号：US11678847

申请日：2007-02-26

Applicant: Christopher D. Moffatt ,  G. Patrick Martin ,  James Tonti

Inventor： Christopher D. Moffatt ,  G. Patrick Martin ,  James Tonti

IPC: H04K1/02 ,  H04L25/03 ,  H04L25/49

CPC classification number: H03F1/3247 ,  H03F1/3294 ,  H03F3/24

Abstract: 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).

Abstract translation: 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。

公开(公告)号：US20090245406A1

公开(公告)日：2009-10-01

申请号：US12060283

申请日：2008-04-01

Applicant: Christopher D. Moffatt ,  Andrew Mattsson ,  John W. Pajunen

Inventor： Christopher D. Moffatt ,  Andrew Mattsson ,  John W. Pajunen

IPC: H04L23/02 ,  H04L27/28

CPC classification number: H04L27/265 ,  G06F17/142 ,  H04L27/2628

Abstract: 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).

Abstract translation: 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。