公开(公告)号：US5715278A

公开(公告)日：1998-02-03

申请号：US479351

申请日：1995-06-07

申请人： Thomas M. Croft ,  Paul W. Dent ,  William J. Croughwell, III

发明人： Thomas M. Croft ,  Paul W. Dent ,  William J. Croughwell, III

IPC分类号： H04B1/16 ,  H04L1/00 ,  H04L1/08 ,  H04L7/033 ,  H04L7/04 ,  H04M19/08 ,  H04W52/02 ,  H04B3/46 ,  G06F11/00

CPC分类号： H04L7/048 ,  H04L1/0053 ,  H04L1/0057 ,  H04L1/0061 ,  H04L1/08 ,  H04M19/08 ,  H04W52/0216 ,  H04W52/0229 ,  H04W52/0235 ,  Y02B60/50

摘要： A method and system for increasing the probability of receiving a message in mobile communication systems. The invention uses a synchronization pattern to determine the location of an intended message. In addition, the invention uses the CRC check status of several sample timing positions spanning an expected message location to determine whether to accept a message. The expected message location is based on the sample timings of previous messages which are determined from a histogram of how frequently various sample timing positions have been selected in the past.

摘要翻译： 一种用于增加在移动通信系统中接收消息的概率的方法和系统。 本发明使用同步模式来确定预期消息的位置。 此外，本发明使用跨越预期消息位置的几个采样定时位置的CRC校验状态来确定是否接受消息。 期望的消息位置是基于从过去已经选择了各种采样定时位置的频率的直方图确定的先前消息的采样定时。

公开(公告)号：US07113593B2

公开(公告)日：2006-09-26

申请号：US09800145

申请日：2001-03-06

申请人： Paul W. Dent ,  Ben Smeets ,  William J. Croughwell, III

发明人： Paul W. Dent ,  Ben Smeets ,  William J. Croughwell, III

IPC分类号： H04K1/00

CPC分类号： G06F7/52 ,  G06F7/552 ,  G06F7/722 ,  G06F7/723 ,  G06F2207/5523 ,  G06F2207/7252 ,  H04L9/302 ,  H04L2209/122

摘要： A method and apparatus for performing cryptographic computations employing recursive algorithms to accelerate multiplication and squaring operations. Products and squares of long integer values are recursively reduced to a combination of products and squares reduced-length integer values in a host processor. The reduced-length integer values are passed to a co-processor. The values may be randomly ordered to prevent disclosure of secret data.

公开(公告)号：US5680418A

公开(公告)日：1997-10-21

申请号：US345848

申请日：1994-11-28

申请人： Thomas M. Croft ,  Torbjorn W. Solve ,  Paul W. Dent

发明人： Thomas M. Croft ,  Torbjorn W. Solve ,  Paul W. Dent

IPC分类号： G01N27/12 ,  G01N30/66 ,  H03D3/00 ,  H03D13/00 ,  H04L22/06

CPC分类号： H03D3/006 ,  G01N27/12 ,  G01N30/66 ,  H03D3/002

摘要： In a digital FM receiver having a demodulator that receives a radio signal and generates therefrom a phase sample whose behavior determines an output of the demodulator, an apparatus for removing a low-frequency interference signal from the phase sample converts the phase sample into a frequency sample which is then high-pass filtered to produce a filtered frequency sample. The filtered frequency sample is then converted into a filtered phase sample, which may be further demodulated in accordance with known techniques. Converting the phase sample into a frequency sample may be performed by a first order difference circuit. Converting the filtered frequency sample into the filtered phase sample may be performed by an integrator. Because the demodulator may produce degraded performance when the inventive apparatus is applied to a radio signal that does not have low-frequency interference, in another aspect of the invention the demodulator is further provided with a circuit for detecting the presence of the low-frequency interference signal in the radio signal, and alternatively selecting, in response thereto, either the filtered or original phase sample to be supplied to further demodulation circuitry.

摘要翻译： 在具有接收无线电信号并由其产生行为确定解调器的输出的相位采样的解调器的数字FM接收机中，从相位采样中去除低频干扰信号的装置将相位样本转换成频率样本 然后将其高通滤波以产生滤波频率样本。 滤波后的频率采样然后被转换成滤波的相位采样，其可以根据已知的技术进一步解调。 将相位采样转换为频率采样可以由一阶差分电路执行。 将滤波后的频率采样转换成滤波的相位采样可由积分器进行。 因为当将本发明的设备应用于不具有低频干扰的无线电信号时，解调器可能产生降级的性能，在本发明的另一方面，解调器还设置有用于检测低频干扰的存在的电路 信号，并且作为响应，选择要提供给另外的解调电路的滤波或原始相位采样。

公开(公告)号：US5568513A

公开(公告)日：1996-10-22

申请号：US59932

申请日：1993-05-11

申请人： Thomas M. Croft ,  Paul W. Dent ,  Lawrence J. Harte ,  Torbjorn Solve

发明人： Thomas M. Croft ,  Paul W. Dent ,  Lawrence J. Harte ,  Torbjorn Solve

IPC分类号： H04B1/16 ,  H04L1/00 ,  H04L1/08 ,  H04L7/04 ,  H04M19/08 ,  H04W52/02 ,  H04B3/46 ,  H04B7/00 ,  G08B5/22

CPC分类号： H04L1/0061 ,  H04L1/0053 ,  H04L1/08 ,  H04L7/048 ,  H04M19/08 ,  H04W52/0216 ,  H04W52/0229 ,  H04W52/0235 ,  Y02B60/50

摘要： A power saving standby mode that can be used in mobile radio stations operating in current networks and improves in the intended message reception. The invention enters the power down mode principally contingent upon the CRC check being successful. Additionally, the invention uses a cumulative majority vote procedure which results in a higher probability of correct reception of a message addressed to the receiving station.

摘要翻译： 一种省电待机模式，可用于在当前网络中运行的移动无线电台，并改善预期的消息接收。 本发明主要取决于CRC校验成功进入掉电模式。 此外，本发明使用累积多数表决程序，这导致更正确地接收到接收站的消息的概率。

公开(公告)号：US5841816A

公开(公告)日：1998-11-24

申请号：US218236

申请日：1994-03-28

申请人： Paul W. Dent ,  Thomas M. Croft

发明人： Paul W. Dent ,  Thomas M. Croft

IPC分类号： H04L27/22 ,  H04B7/08 ,  H04L25/03 ,  H04L25/30 ,  H04L27/233 ,  H04L29/12 ,  H04L1/06 ,  H04L7/04

CPC分类号： H04L25/03178 ,  H04B7/0857 ,  H04L27/2337 ,  H04L2025/0356

摘要： A method and system for demodulating received signals in radio communication systems. Pi/4-DQPSK modulated signals can be demodulated to provide additional quality measurements and to facilitate diversity combination or selection. For example, a carrier is modulated with digital data using Pi/4-DQPSK to convey two bits of data by changing the radio carrier phase from the value at the end of the last symbol through an angle of either .+-.45 degrees or .+-.135 degrees, these four possibilities representing the bit pairs 00, 01, 11 or 10. The transitions of the radio signal are filtered in the complex (I,Q) plane to limit the spectrum. At the receiver, the received signal is downconverted, filtered and amplified using a hard-limiting intermediate frequency (IF) amplifier. The IF amplifier also produces an approximately logarithmic indication of the signal strength before limiting. The hard-limited IF signal containing phase information is fed to a direct phase digitizer. A numerical value representing instantaneous phase is produced and processed to demodulate data symbols. The demodulated data symbols can be combined with the logarithmic signal strength information to produce quality-annotated data bits to an error-correction decoder.

摘要翻译： 一种在无线电通信系统中解调接收信号的方法和系统。 可以对Pi / 4-DQPSK调制信号进行解调，以提供额外的质量测量并促进分集组合或选择。 例如，使用Pi / 4-DQPSK通过数字数据对载波进行调制，以通过将最后一个符号的结尾处的无线电载波相位改变为+/- 45度或+ / -135度，这四种可能性代表位对00,01,11或10.无线电信号的转变在复数（I，Q）平面中被滤波以限制频谱。 在接收机处，使用硬限幅中频（IF）放大器对接收到的信号进行下变频，滤波和放大。 IF放大器还产生限制前的信号强度的近似对数指示。 包含相位信息的硬限制IF信号被馈送到直接相位数字转换器。 产生表示瞬时相位的数值并进行处理以解调数据符号。 解调的数据符号可以与对数信号强度信息组合以产生质量注释的数据位到纠错解码器。

公开(公告)号：US09559768B2

公开(公告)日：2017-01-31

申请号：US12034283

申请日：2008-02-20

申请人： Paul W. Dent

发明人： Paul W. Dent

IPC分类号： H04B7/185

CPC分类号： H04B7/18526

摘要： A satellite broadcasts radio programs to mobile and fixed receivers at various locations. Ground stations supplement the satellite broadcasts in areas where the satellite signal may be shadowed. Likewise, the satellite signal supplements the terrestrial transmissions in areas with marginal terrestrial signal strength. Ground stations and a satellite transmit the same digital symbol stream over a same frequency spectrum. The symbol streams arrive in each service area of the ground stations with a relative delay that is within a window for which a receiver is adapted to decode efficiently. Spectral efficiency is achieved by allowing the ground stations to share the same frequencies as the satellites.

摘要翻译： 卫星向各种地点的移动和固定接收机广播无线电节目。 地面站补充卫星信号可能被遮蔽的地区的卫星广播。 同样，卫星信号补充地面信号强度较低的地区的地面传输。 地面站和卫星在同一频谱上发送相同的数字符号流。 符号流在地面站的每个服务区域中到达接收机适于对其进行有效解码的相对延迟。 通过允许地面站与卫星共享相同的频率来实现光谱效率。

公开(公告)号：US08259845B2

公开(公告)日：2012-09-04

申请号：US12126576

申请日：2008-05-23

申请人： Paul W. Dent

发明人： Paul W. Dent

IPC分类号： H04L25/03

CPC分类号： H04L25/03834 ,  H04L25/03821 ,  H04L25/0384 ,  H04L25/03859 ,  H04L27/2626 ,  H04L27/2647

摘要： A communication system (20) comprises a transmitter (22) and a receiver (24). The transmitter (22) comprises a source of information symbols (30); a pulse shaping wave function generator (32); and a combiner (34) configured to express the information symbols received from the source as signals which are shaped in time and frequency domains by the wave function. The pulse shaping wave function generator (32) is configured to provide a wave function which has the Nyquist property and has a same shape as its own Fourier transform. The combiner (34) is configured to combine the wave function with a stream of digital data symbols to produce a filtered stream for transmission by the transmitter.

摘要翻译： 通信系统（20）包括发射机（22）和接收机（24）。 发射机（22）包括信息符号源（30）; 脉冲整形波函数发生器（32）; 以及组合器（34），被配置为将从源接收的信息符号表示为通过波函数在时域和频域中成形的信号。 脉冲整形波函数发生器（32）被配置为提供具有奈奎斯特性质并且具有与其自身傅里叶变换相同形状的波函数。 组合器（34）被配置为将波函数与数字数据符号流组合以产生经过滤波以供发射机传输。

公开(公告)号：US20110150049A1

公开(公告)日：2011-06-23

申请号：US12645856

申请日：2009-12-23

申请人： Paul W. Dent

发明人： Paul W. Dent

IPC分类号： H04L27/28 ,  H04B1/38

CPC分类号： H04L5/0053 ,  H04L5/0048 ,  H04L5/0057

摘要： A method and apparatus for efficiently providing a large volume of channel feedback, e.g., for OFDM MISO and MIMO systems, is described herein. To that end, a mapping unit in an OFDM transceiver maps channel feedback values, e.g., received reference signal values or channel estimates derived therefrom, on a one-to-one basis to individual transmission subchannels. More particularly, the mapping unit maps a feedback value, e.g., the received reference value or a channel estimate derived therefrom, to a single transmission subchannel of an outgoing OFDM signal. For example, the mapping unit may map the feedback value to an input of a frequency transform unit, such as an inverse discrete Fourier transform unit, to map the feedback value to a single transmission subchannel comprising an OFDM transmission subcarrier. The OFDM transceiver transmits the outgoing OFDM signal to the remote transceiver to provide the feedback value to the remote transceiver.

摘要翻译： 本文描述了用于有效地提供大量信道反馈的方法和装置，例如用于OFDM MISO和MIMO系统。 为此，OFDM收发器中的映射单元将信道反馈值（例如，接收到的参考信号值或从其导出的信道估计）一一对应地映射到各个传输子信道。 更具体地，映射单元将例如所接收的参考值或其导出的信道估计的反馈值映射到输出OFDM信号的单个传输子信道。 例如，映射单元可以将反馈值映射到诸如逆离散傅立叶变换单元的频率变换单元的输入，以将反馈值映射到包括OFDM发送子载波的单个发送子信道。 OFDM收发器将输出的OFDM信号发送到远程收发器以向远程收发器提供反馈值。

公开(公告)号：US20080291821A1

公开(公告)日：2008-11-27

申请号：US11929268

申请日：2007-10-30

申请人： Paul W. Dent

发明人： Paul W. Dent

IPC分类号： H04J11/00 ,  H04B7/216

CPC分类号： H04J13/10 ,  H04B1/7097 ,  H04B2201/709709

摘要： The technology in this application solves these problems (and others) and meets the desirable goals identified above (and others). The technology spreads a signal over an available discontinuous spectrum, such as a radio frequency band, so that the spread signal only occupies the non-contiguous spectrum. In this way, CDMA transmission and reception can be used in a fragmented or non-contiguous spectum that otherwise would not be useable for direct sequence spreading. Spreading over non-contiguous portions of spectrum is preferably performed without producing unacceptable interference in portions of unavailable spectrum located between the allowed spectrum. By avoiding unacceptable interference in portions of unavailable spectrum located between the allowed spectrum, the unavailable spectrum may be used by other users or services.

摘要翻译： 在这个应用中的技术解决了这些问题（和其他），并满足了上述（和其他）所确定的理想目标。 该技术在可用的不连续频谱（例如射频频带）上传播信号，使得扩展信号仅占据非连续频谱。 以这种方式，CDMA发送和接收可以用于分段或不连续的光谱，否则不能用于直接序列扩展。 优选地在频谱的非连续部分上扩展，而不会在位于允许频谱之间的不可用频谱的部分中产生不可接受的干扰。 通过避免位于允许频谱之间的部分不可用频谱中的不可接受的干扰，不可用频谱可被其他用户或服务使用。

公开(公告)号：US07184492B2

公开(公告)日：2007-02-27

申请号：US10361244

申请日：2003-02-10

申请人： Paul W. Dent

发明人： Paul W. Dent

IPC分类号： H04L27/04

CPC分类号： H04B7/0671 ,  H04B7/0408 ,  H04B7/0617 ,  H04B7/0695

摘要： The invention comprises using beamforming antenna to coherently transmit an information signal to a receiver using two or more directional beams. In one embodiment, the phase and timing of the information signals carried by each directional beams are adjusted such that the signals arrive synchronously at the mobile terminal. Time synchronization may be obtained by delaying signals transmitted on selected directional beams to compensate for different propagation delays, or by preconditioning and filtering the signals using a channel coefficient matrix.

摘要翻译： 本发明包括使用波束形成天线使用两个或更多个定向波束将信息信号相干地发射到接收机。 在一个实施例中，调整每个定向波束所携带的信息信号的相位和定时，使得信号在移动终端同步到达。 可以通过延迟在所选定向波束上传输的信号来补偿不同的传播延迟，或通过使用信道系数矩阵预处理和滤波信号来获得时间同步。