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21.发明授权Orthogonal frequency division multiplexing (OFDM) communications device and method that incorporates low PAPR preamble and receiver channel estimate circuit 有权正交频分复用（OFDM）通信设备和方法，其包括低PAPR前同步码和接收机信道估计电路公开(公告)号：US08189697B2
公开(公告)日：2012-05-29
申请号：US12242967
申请日：2008-10-01
CPC分类号： H04L27/2613 , H04L25/022 , H04L27/2618 , H04L27/262 , H04L27/2647
摘要： 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.
摘要翻译： 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。
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22.发明授权Orthogonal frequency division multiplexing (OFDM) communications device and method that incorporates low PAPR preamble and variable number of OFDM subcarriers 有权正交频分复用（OFDM）通信设备和方法，其包括低PAPR前导码和可变数量的OFDM子载波公开(公告)号：US08175178B2
公开(公告)日：2012-05-08
申请号：US12242958
申请日：2008-10-01
CPC分类号： H04L27/262 , H04L27/2613 , H04L27/2618
摘要： 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).
摘要翻译： 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。
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23.发明授权System and method for applying frequency domain spreading to multi-carrier communications signals 有权将频域扩展应用于多载波通信信号的系统和方法公开(公告)号：US07903749B2
公开(公告)日：2011-03-08
申请号：US11464857
申请日：2006-08-16
IPC分类号： H04K1/10
CPC分类号： H04L27/2608 , H04B1/707
摘要： A system and device communicates data. A modulation and mapping circuit modulates and maps data symbols into a plurality of multiple subcarriers that are orthogonal to each other based on a fixed or variable symbol rate. A frequency domain spreader circuit is operatively connected to the modulation and mapping circuit and spreads the multiple subcarriers over the frequency domain.
摘要翻译： 系统和设备通信数据。 调制和映射电路基于固定或可变符号速率将数据符号调制并映射到彼此正交的多个多个子载波中。 频域扩展器电路可操作地连接到调制和映射电路，并在频域上扩展多个子载波。
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24.发明授权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）与应用的频域扩展来传送数据的系统和方法公开(公告)号：US07649951B2
公开(公告)日：2010-01-19
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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25.发明申请System and Method for Communicating Data Using Symbol-Based Randomized Orthogonal Frequency Division Multiplexing (OFDM) 有权基于符号的随机正交频分复用（OFDM）数据通信系统和方法公开(公告)号：US20080043861A1
公开(公告)日：2008-02-21
申请号：US11464877
申请日：2006-08-16
IPC分类号： H04K1/10
CPC分类号： H04L27/2634 , H04L27/2618
摘要： A system and device communicates data. A modulation and mapping circuit 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 is operative with the modulation and mapping circuit for generating 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, reduced power per frequency (dB/Hz/sec), and lower any required transmission power while maintaining an instantaneous signal-to-noise ratio.
摘要翻译： 系统和设备通信数据。 调制和映射电路将数据符号调制并映射成彼此正交的多个子载波频率，以便基于固定或可变OFDM符号速率形成正交频分复用（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，用于基于用于以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， 降低每频率的功率（dB / Hz /秒），并降低任何所需的传输功率，同时保持瞬时信噪比。
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26.发明申请Method of Communicating and Associated Transmitter Using Coded Orthogonal Frequency Division Multiplexing (COFDM) 有权使用编码正交频分复用（COFDM）的通信和相关发射机的方法公开(公告)号：US20080043814A1
公开(公告)日：2008-02-21
申请号：US11464868
申请日：2006-08-16
CPC分类号： H04L27/2614 , H04B1/7103 , H04L27/2634 , H04L27/265
摘要： A system and method communicates and generates a Coded Orthogonal Frequency Division Multiplexed (COFDM) communications signal as a plurality of subcarriers. Selected subcarriers are turned ON and OFF while also frequency hopping and spreading the selected ON subcarriers over the frequency domain based on a fixed or variable sample rate to reduce average power for enhanced Low Probability of Interception/Low Probability of Detection (LPI/LPD) and also allow for more transmit power within a spectral mask.
摘要翻译： 系统和方法将编码的正交频分复用（COFDM）通信信号作为多个副载波进行通信和产生。 所选择的子载波也被开启和关闭，同时跳频并基于固定或可变的采样率在频域上扩展所选择的ON子载波，以降低平均功率，以增强低截止/低检测概率（LPI / LPD）的低概率和 也允许在光谱掩模内有更多的发射功率。
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