公开(公告)号：US08265180B2

公开(公告)日：2012-09-11

申请号：US12095575

申请日：2006-11-30

Applicant: Charles Razzell

Inventor： Charles Razzell

IPC: H04K1/10 ,  H04L27/28

CPC classification number: H04L5/0058 ,  H04L5/0007 ,  H04L5/0094

Abstract: A system, device and method are described for suppressing certain sub-carrier frequencies within a multi-path transmission system and efficiently notifying a receiver (400) of the suppressed sub-carriers. In various embodiments of the invention, an OFDM system uses the preamble (210) of an OFDM burst for indicating which sub-carrier frequencies are being suppressed by a transmitter (300).

Abstract translation: 描述了一种系统，装置和方法，用于抑制多路径传输系统内的某些副载波频率，并有效地通知接收机（400）抑制的副载波。 在本发明的各种实施例中，OFDM系统使用OFDM突发的前导码（210）来指示发射机（300）正在抑制哪些子载波频率。

公开(公告)号：US08009724B2

公开(公告)日：2011-08-30

申请号：US11574235

申请日：2005-08-25

Applicant: Charles Razzell ,  Yifeng Zhang

Inventor： Charles Razzell ,  Yifeng Zhang

IPC: H04B1/00

CPC classification number: H04L27/2647 ,  H04L5/0007 ,  H04L27/0006 ,  H04L27/2605 ,  H04W24/00 ,  H04W52/0232 ,  H04W52/0245 ,  H04W74/00 ,  Y02D70/142

Abstract: Clear channel assessment (CCA) is a very important issue in Ultra-Wideband (UWB) systems. An effective CCA mechanism will have a large impact on the overall throughput of the communications system. It is disclosed methods and circuits to carry out CCA determinations exploiting the structure of the pulse signal either by using a moving average or by performing a cross-correlation with a locally generated signal.

Abstract translation: 清晰频道评估（CCA）是超宽带（UWB）系统中非常重要的课题。 有效的共同国家评估机制将对通信系统的整体吞吐量产生很大的影响。 公开了通过使用移动平均或通过与本地产生的信号进行互相关来执行利用脉冲信号的结构的CCA确定的方法和电路。

公开(公告)号：US07809067B2

公开(公告)日：2010-10-05

申请号：US10853436

申请日：2004-05-24

Applicant: Charles Razzell

Inventor： Charles Razzell

IPC: H04K1/10

CPC classification number: H04L27/2602 ,  H04L5/026 ,  H04L27/2601

Abstract: The present invention, generally speaking, provides for signaling methods in which multiple sub-hands of a transmission band are continuously occupied by an OFDM signal that would otherwise occupy only a single sub-hand. In accordance with one embodiment, steps include producing an OFDM symbol; transforming the OFDM symbol to produce an OFDM signal; upsampling the OFDM signal to produce an upsampled OFDM signal; applying a pseudo-random code to the upsampled OFDM signal to produce a coded OFDM signal; and upconverting the coded OFDM signal to produce a radio frequency signal. In accordance with another embodiment, steps include producing a sequence of N consecutive identical OFDM symbols; transforming the OFDM symbols to produce corresponding OFDM signals; and upconverting the coded OFDM signal to produce a radio frequency signal; wherein the radio frequency signal occupies N sub-hands of a transmission band.

Abstract translation: 本发明一般地提供了一种信令方法，其中传输频带的多个子手由OFDM信号连续占用，否则OFDM信号将仅占用单个子手。 根据一个实施例，步骤包括产生OFDM符号; 转换OFDM符号以产生OFDM信号; 对OFDM信号进行上采样以产生上采样的OFDM信号; 将伪随机码应用于上采样的OFDM信号以产生编码的OFDM信号; 并且上变频编码的OFDM信号以产生射频信号。 根据另一个实施例，步骤包括产生N个连续相同OFDM符号的序列; 转换OFDM符号以产生相应的OFDM信号; 并且上变频编码的OFDM信号以产生射频信号; 其中射频信号占据传输频带的N个子手。

公开(公告)号：US07536159B2

公开(公告)日：2009-05-19

申请号：US10535555

申请日：2003-11-14

Applicant: Charles Razzell

Inventor： Charles Razzell

IPC: H04B7/00

CPC classification number: H03G3/001 ,  H03G3/3068 ,  H03M1/185 ,  H04B1/109 ,  H04B1/28

Abstract: In a radio including analog and digital portions, with at least one A/D Convener between the analog and digital portions, and the selectivity of the radio at least partly implemented in the digital domain, an AGC controller sets a first variable gain amplifier (VGA) (302) to low gain upon a determination that a wide-band power estimation exceeds a wide-band threshold. The wide-b and threshold is selected to reduce the occurrence of A/D converter saturation. If the wide-band power estimation is less than the wide-band threshold, then for each VGA (302) in the analog portion, a determination is made whether a narrow band power estimate exceeds a narrow-band threshold, corresponding to that VGA (302), plus a hysteresis value, in which case that VGA (302) is set to low gain; or whether the narrow-band energy estimate is less than the narrow-band threshold minus a hysteresis value, in which case that VGA (302) is set to high gain.

Abstract translation: 在包括模拟和数字部分的无线电中，在模拟和数字部分之间具有至少一个A / D转换器，以及至少部分地在数字域中实现的无线电的选择性，AGC控制器设置第一可变增益放大器 ）（302）在宽带功率估计超过宽带阈值的确定时为低增益。 选择宽b和阈值以减少A / D转换器饱和的发生。 如果宽带功率估计小于宽带阈值，则对于模拟部分中的每个VGA（302），确定窄带功率估计是否超过窄带阈值，对应于该VGA（ 302），加上滞后值，在这种情况下VGA（302）被设置为低增益; 或者窄带能量估计是否小于窄带阈值减去迟滞值，在这种情况下VGA（302）被设置为高增益。

公开(公告)号：US20050259758A1

公开(公告)日：2005-11-24

申请号：US10853436

申请日：2004-05-24

Applicant: Charles Razzell

Inventor： Charles Razzell

IPC: H04B1/69 ,  H04K1/10 ,  H04L5/02 ,  H04L27/26

CPC classification number: H04L27/2602 ,  H04L5/026 ,  H04L27/2601

Abstract: The present invention, generally speaking, provides for signaling methods in which multiple sub-bands of a transmission band are continuously occupied by an OFDM signal that would otherwise occupy only a single sub-band. In accordance with one embodiment, steps include producing an OFDM symbol; transforming the OFDM symbol to produce an OFDM signal; upsampling the OFDM signal to produce an upsampled OFDM signal; applying a pseudo-random code to the upsampled OFDM signal to produce a coded OFDM signal; and upconverting the coded OFDM signal to produce a radio frequency signal. In accordance with another embodiment, steps include producing an OFDM symbol; transforming the OFDM symbol to produce an OFDM signal; and upconverting the coded OFDM signal to produce a radio frequency signal; wherein the radio frequency signal occupies multiple ones of the following sub-bands: a first sub-band from about 3200 MHz to about 3700 MHz; a second sub-band from about 4000 MHz to about 4200 MHz; and a third sub-band from about 4200 MHz to about 4800 MHz. In accordance with still another embodiment, steps include producing a sequence of N consecutive identical OFDM symbols; transforming the OFDM symbols to produce corresponding OFDM signals; and upconverting the coded OFDM signal to produce a radio frequency signal; wherein the radio frequency signal occupies N sub-bands of a transmission band.

Abstract translation: 本发明一般地提供了一种信令方法，其中传输频带的多个子带被否则仅占用单个子带的OFDM信号连续占用。 根据一个实施例，步骤包括产生OFDM符号; 转换OFDM符号以产生OFDM信号; 对OFDM信号进行上采样以产生上采样的OFDM信号; 将伪随机码应用于上采样的OFDM信号以产生编码的OFDM信号; 并且上变频编码的OFDM信号以产生射频信号。 根据另一实施例，步骤包括产生OFDM符号; 转换OFDM符号以产生OFDM信号; 并且上变频编码的OFDM信号以产生射频信号; 其中所述射频信号占据以下子带中的多个子带：从约3200MHz到约3700MHz的第一子带; 从大约4000MHz到大约4200MHz的第二子带; 以及从约4200MHz到约4800MHz的第三子带。 根据又一实施例，步骤包括产生N个连续相同OFDM符号的序列; 转换OFDM符号以产生相应的OFDM信号; 并且上变频编码的OFDM信号以产生射频信号; 其中射频信号占据传输频带的N个子带。

公开(公告)号：US08634492B2

公开(公告)日：2014-01-21

申请号：US11597587

申请日：2005-05-20

Applicant: Charles Razzell

Inventor： Charles Razzell

IPC: H04L27/00 ,  H04B1/00

CPC classification number: H04L27/2602 ,  H04B1/692 ,  H04B1/707 ,  H04L5/0021 ,  H04L5/0048 ,  H04L5/0064 ,  H04L25/0224 ,  H04L25/03159 ,  H04L27/2607 ,  H04L2025/03414

Abstract: A method and apparatus for transmitting and receiving high-bandwidth OFDM signals, while limiting the complexity of the OFDM signal processing is described. Bandwidth expansion is achieved by repetition of whole OFDM symbols with the polarity of repetitions determined by a long PN code. This technique ensures a perfectly white spectrum. Use of zero-suffix OFDM symbols allows a large tolerance to multipath channels, even while maintaining a single, low-rate RAKE finger for despreading in the receiver.

Abstract translation: 描述了在限制OFDM信号处理的复杂度的同时发送和接收高带宽OFDM信号的方法和装置。 带宽扩展通过重复整个OFDM符号来实现，具有由长PN码确定的重复极性。 这种技术确保了完美的白光谱。 使用零后缀OFDM符号允许对多径信道的大容限，即使在维持单个低速RAKE手指以在接收机中进行解扩。

公开(公告)号：US08532224B2

公开(公告)日：2013-09-10

申请号：US12735201

申请日：2008-12-19

Applicant: Remco Van De Beek ,  Domine Leenaerts ,  Charles Razzell ,  Jozef R. M. Ervoet

Inventor： Remco Van De Beek ,  Domine Leenaerts ,  Charles Razzell ,  Jozef R. M. Ervoet

IPC: H03C3/00

CPC classification number: H03D7/00 ,  H03D2200/0047 ,  H03D2200/0082 ,  H04L5/0007 ,  H04L27/0014 ,  H04L27/227 ,  H04L27/2601 ,  H04L27/364 ,  H04L2027/0016 ,  H04L2027/0022 ,  H04L2027/0032 ,  H04L2027/0065

Abstract: A signal processing circuit comprises a frequency up-conversion circuit (14, 60) for performing up-conversion with a first local oscillator frequency and a frequency down-conversion circuit (16) for performing down-conversion with a second local oscillator frequency. A digital signal processor (10) controls supply first signals representing a first complex signal to the up-conversion circuit, and receives second signals representing a second complex signal. The digital signal processor controls a compensation of I/Q mismatch of results of up-conversion and/or down-conversion. The digital signal processor (10) switches to a calibration mode for selecting a parameter of said compensation. In the calibration mode the first and second local oscillator frequencies have a frequency offset with respect to each other. The digital signal processor (10) measures an amplitude of a frequency component at a frequency corresponding to mismatch in one and not more than one of the results of up-conversion and/or down-conversion, and selects the parameter dependent on the amplitude.

Abstract translation: 信号处理电路包括用于以第一本地振荡器频率执行上变频的升频转换电路（14,60）和用于执行具有第二本机振荡器频率的下变频的降频转换电路（16）。 数字信号处理器（10）控制向上转换电路提供表示第一复信号的第一信号，并接收表示第二复信号的第二信号。 数字信号处理器控制上转换和/或下转换结果的I / Q不匹配的补偿。 数字信号处理器（10）切换到用于选择所述补偿的参数的校准模式。 在校准模式中，第一和第二本地振荡器频率相对于彼此具有频率偏移。 数字信号处理器（10）以对应于上变频和/或下变频结果中的一个且不超过一个失配的频率测量频率分量的幅度，并且根据幅度选择参数。

公开(公告)号：US08126096B2

公开(公告)日：2012-02-28

申请号：US12096982

申请日：2006-12-08

Applicant: Jun Yang ,  Dagnachew Birru ,  Seyed-Alireza Seyedi-Esfahani ,  Charles Razzell

Inventor： Jun Yang ,  Dagnachew Birru ,  Seyed-Alireza Seyedi-Esfahani ,  Charles Razzell

IPC: H04B7/10 ,  H04K3/00

CPC classification number: H04B7/0814 ,  H04B1/713 ,  H04L1/0606 ,  H04L1/0631 ,  H04L1/0668 ,  H04L27/2647

Abstract: The present invention provides a system (300-400), apparatus (300-400), and method for an energy-based antenna selection technique in which the antenna that observes the largest SNR averaged over all carriers per sub-band (405) is selected for space-time coded MB-OFDM systems. Due to the frequency-selective nature of the system, different sub-band may have different channel gaining effect from the multi-path channels. We can perform energy-based antenna selection per sub-band, and the simulation results show that the proposed technique works not only for MB-OFDM UWB channels with shadowing, but also for the same channel without shadowing.

Abstract translation: 本发明提供一种用于基于能量的天线选择技术的系统（300-400），装置（300-400）及其方法，其中观察每个子带（405）在所有载波上平均的最大SNR的天线是 选择用于空时编码的MB-OFDM系统。 由于系统的频率选择性，不同的子带可能具有来自多路径信道的不同信道增益效应。 我们可以对每个子带进行基于能量的天线选择，仿真结果表明，该技术不仅可以用于具有阴影的MB-OFDM UWB信道，而且对于没有阴影的相同信道也是有效的。

公开(公告)号：US08103234B2

公开(公告)日：2012-01-24

申请号：US12415029

申请日：2009-03-31

Applicant: Charles Razzell

Inventor： Charles Razzell

IPC: H04B7/00

CPC classification number: H03G3/001 ,  H03G3/3068 ,  H03M1/185 ,  H04B1/109 ,  H04B1/28

Abstract: In a radio including analog and digital portions, with at least one A/D converter between the analog and digital portions, and the selectivity of the radio at least partly implemented in the digital domain, an AGC controller sets a first variable gain amplifier (VGA) (302) to low gain upon a determination that a wide-band power estimation exceeds a wide-band threshold. The wide-band threshold is selected to reduce the occurrence of A/D converter saturation. If the wide-band power estimation is less than the wide-band threshold, then for each VGA (302) in the analog portion, a determination is made whether a narrow-band power estimate exceeds a narrow-band threshold, corresponding to that VGA (302), plus a hysteresis value, in which case that VGA (302) is set to low gain; or whether the narrow-band energy estimate is less than the narrow-band threshold minus a hysteresis value, in which case that VGA (302) is set to high gain.

Abstract translation: 在包括模拟和数字部分的无线电中，在模拟和数字部分之间具有至少一个A / D转换器，以及至少部分地在数字域中实现的无线电的选择性，AGC控制器设置第一可变增益放大器 ）（302）在宽带功率估计超过宽带阈值的确定时为低增益。 选择宽带阈值以减少A / D转换器饱和的发生。 如果宽带功率估计小于宽带阈值，则对于模拟部分中的每个VGA（302），确定窄带功率估计是否超过窄带阈值，对应于该VGA （302），加上滞后值，在这种情况下VGA（302）被设置为低增益; 或者窄带能量估计是否小于窄带阈值减去迟滞值，在这种情况下VGA（302）被设置为高增益。

公开(公告)号：US20110010551A1

公开(公告)日：2011-01-13

申请号：US12920525

申请日：2009-03-05

Applicant: Charles Razzell

Inventor： Charles Razzell

IPC: H04L9/06

CPC classification number: H04L9/0838 ,  H04L2209/80 ,  H04W12/04

Abstract: An apparatus and method for generating a shared secret between at least two wireless portable electronic devices. A shared secret is generated by holding together the at least two devices and shaking them. An acceleration of the at least two devices is measured at least during a time window beginning at a time corresponding to when a magnitude of the acceleration exceeds a predetermined threshold. The acceleration is sampled, resulting in a plurality of vectors, such that a first vector is an initial sample of the acceleration during the time window. In some embodiments, the acceleration is measured in three dimensions. Dot products are calculated between the first vector and each of a plurality of subsequent vectors, resulting in an array of scalars. At least a portion of this array is used to generate the shared secret between the at least two devices.

Abstract translation: 一种用于在至少两个无线便携式电子设备之间产生共享秘密的装置和方法。 通过将至少两个设备保持在一起并摇动来产生共享的秘密。 至少在从加速度的大小超过预定阈值的时刻开始的时间窗口中至少测量至少两个装置的加速度。 加速度被采样，导致多个向量，使得第一向量是在时间窗口期间的加速度的初始样本。 在一些实施例中，三维测量加速度。 在第一向量和多个后续向量中的每一个之间计算点积，得到标量数组。 该阵列的至少一部分用于在至少两个设备之间生成共享秘密。