公开(公告)号：US20070026820A1

公开(公告)日：2007-02-01

申请号：US11189210

申请日：2005-07-26

申请人： Mohsen Sarraf

发明人： Mohsen Sarraf

IPC分类号： H04B1/02 ,  H04B1/66

CPC分类号： H04B1/707 ,  H04B2201/70706

摘要： Techniques to reduce signal amplitude peak-to-average ratio (PAR) in a wireless communications system are described. The apparatus may include a signal conditioning module to receive a baseband signal. The signal conditioning module may split the baseband signal along multiple paths, delay one or more of the paths, and combine the multiple paths to form a conditioned signal having lower signal amplitude PAR than the baseband signal. Other embodiments are described and claimed.

摘要翻译： 描述了在无线通信系统中降低信号幅度峰均比（PAR）的技术。 该装置可以包括用于接收基带信号的信号调节模块。 信号调理模块可以沿着多个路径分割基带信号，延迟一个或多个路径，并且组合多个路径以形成具有比基带信号更低的信号幅度PAR的调节信号。 描述和要求保护其他实施例。

公开(公告)号：US06665356B1

公开(公告)日：2003-12-16

申请号：US09329399

申请日：1999-06-10

申请人： Thomas W. Goeddel ,  Alex Matusevich ,  Mohsen Sarraf ,  Jonathan M. Tobias ,  Sheng-Jen Tsai

发明人： Thomas W. Goeddel ,  Alex Matusevich ,  Mohsen Sarraf ,  Jonathan M. Tobias ,  Sheng-Jen Tsai

IPC分类号： H04L2722

CPC分类号： H04L7/0334

摘要： A phase-modulated signal such as a quadrature phase-shift-keyed (QPSK) signal in a wireless communication system is demodulated using sample timing based at least in part on frequency information generated by frequency demodulating the phase-modulated signal. The phase-modulated signal is separated into first and second portions, the first portion is phase demodulated to generate demodulated symbols, and the second portion is frequency demodulated to generate, e.g., a measure of the instantaneous frequency of the phase-modulated signal. The instantaneous frequency measure is processed to identify one or more symbol transitions, and the identified transitions are used to establish the sample timing such that proper sampling of the symbols is ensured.

摘要翻译： 至少部分地基于通过频率解调相位调制信号生成的频率信息，使用采样定时解调无线通信系统中的相位调制信号，例如正交相移键控（QPSK）信号。 相位调制信号被分离为第一和第二部分，第一部分被相位解调以产生解调符号，并且第二部分被频率解调以产生例如相位调制信号的瞬时频率的测量。 处理瞬时频率测量以识别一个或多个符号转换，并且使用所识别的转换来建立采样定时，从而确保符号的适当采样。

公开(公告)号：US6067295A

公开(公告)日：2000-05-23

申请号：US782357

申请日：1997-01-13

申请人： Ahmad R. Bahai ,  Mohsen Sarraf ,  James Paul Seymour

发明人： Ahmad R. Bahai ,  Mohsen Sarraf ,  James Paul Seymour

IPC分类号： H04B7/08 ,  H04L1/06 ,  H04L25/03 ,  H04B15/00

CPC分类号： H04L25/03006 ,  H04B7/0845 ,  H04L1/06 ,  H04L2025/03375 ,  H04L2025/03535

摘要： An efficient method and apparatus for reducing the effect of ghost signals during the recovery of information bits in wireless systems. The delay spread between each burst and its ghost are estimated so that an equalizer is only engaged to eliminate the effects of the ghost on data recovery when the delay spread increases beyond a given threshold. The estimation of the nonstationary delay spread is based on the estimation of the impulse response of the wireless channel. That is, the response of how the burst and its ghost will be reflected in the wireless channel. Since, the burst and its ghost arrive at the receiver .tau. symbol times apart and have different and random power with respect to each other, once the channel impulse is accurately estimated, the value of .tau. can be used to determine whether to engage or disengage an equalizer. That is, the equalizer is only turned on if .tau. is beyond a predetermined threshold, wherein the threshold is chosen depending on the needs and/or specifications of the system performance.

摘要翻译： 一种用于在无线系统中恢复信息位期间减少重影信号的影响的有效方法和装置。 估计每个突发与其重影之间的延迟扩展，使得均衡器仅在延迟扩展增加超过给定阈值时才被用于消除重影对数据恢复的影响。 非平稳延迟扩展的估计是基于无线信道的脉冲响应的估计。 也就是说，在无线信道中如何反映突发及其鬼魂的反应。 由于脉冲串及其重影间隔时间到达接收器T 1符号，并且相对于彼此具有不同的和随机的功率，所以一旦准确地估计信道脉冲，则τ的值可用于确定是否接合 均衡器 也就是说，如果tau超过预定阈值，均衡器才被接通，其中根据系统性能的需要和/或规格选择阈值。

公开(公告)号：US09467235B1

公开(公告)日：2016-10-11

申请号：US14613166

申请日：2015-02-03

申请人： Walid Khairy Mohamed Ahmed ,  Mohsen Sarraf ,  Xiaopeng Huang

发明人： Walid Khairy Mohamed Ahmed ,  Mohsen Sarraf ,  Xiaopeng Huang

IPC分类号： H04B11/00

CPC分类号： H04B11/00

摘要： Circuits, systems and methods that utilize two transducers, of which at least one is a piezoelectric transducer, adapted and coupled to receive and/or generate signals in the forms of sound waves, mechanical vibrations, and/or electromagnetic energy. In one version, two transducers each receive and/or generate separate vibrational energy signals that bear information. Two or more transducers coupled to a switching circuit may send or receive piezo-electrical circuit output signals that include a carrier wave having different frequencies that are within separate frequency ranges. Two or more transducers may generate output signals that are simultaneously processed by or multiplexed by a switching circuit.

摘要翻译： 使用两个换能器的电路，系统和方法，其中至少一个是压电换能器，其被适配和耦合以接收和/或产生声波，机械振动和/或电磁能的形式的信号。 在一个版本中，两个换能器接收和/或产生承载信息的单独的振动能量信号。 耦合到开关电路的两个或更多个换能器可以发送或接收包括在不同频率范围内的具有不同频率的载波的压电电路输出信号。 两个或更多个换能器可以产生由开关电路同时处理或由开关电路复用的输出信号。

公开(公告)号：US20090086761A1

公开(公告)日：2009-04-02

申请号：US12239524

申请日：2008-09-26

申请人： Maryam Mirmobini ,  Mohsen Sarraf ,  Chris Vaios

发明人： Maryam Mirmobini ,  Mohsen Sarraf ,  Chris Vaios

IPC分类号： H04L29/04

CPC分类号： H04L69/04 ,  H04L65/607 ,  H04N21/235 ,  H04N21/23614 ,  H04N21/4348 ,  H04N21/435 ,  H04N21/812

摘要： A system and method for providing ancillary data over compressed multimedia packets. Ancillary data may be added to encoded or compressed packets without increasing the bandwidth required to transmit the packets over a transmission medium. After transmission, the ancillary data can be recovered and the packets restored to their original form without any loss of data or damage to original content. The ancillary data can be presented to a user on-demand, or in response to an event. The content of the ancillary data can also be correlated to the type of event that initiated the delivery or to the content of the encoded or compressed packets.

摘要翻译： 一种用于通过压缩的多媒体分组提供辅助数据的系统和方法。 辅助数据可以被添加到编码或压缩的分组，而不增加在传输介质上传送分组所需的带宽。 传输后，可以恢复辅助数据，并将数据包恢复到原始形式，而不会丢失数据或损坏原始内容。 辅助数据可以按需呈现给用户，或响应于事件。 辅助数据的内容还可以与发起传送的事件的类型或编码或压缩的数据包的内容相关联。

公开(公告)号：US07359446B2

公开(公告)日：2008-04-15

申请号：US10639524

申请日：2003-08-13

申请人： Tongtong Li ,  Masoud Sajadieh ,  Mohsen Sarraf ,  Masood Yousefi ,  Robert L. Cupo ,  Thomas W. Goeddel

发明人： Tongtong Li ,  Masoud Sajadieh ,  Mohsen Sarraf ,  Masood Yousefi ,  Robert L. Cupo ,  Thomas W. Goeddel

IPC分类号： H04L23/02 ,  H03D1/00

CPC分类号： H04L1/0059 ,  H04L1/0054 ,  H04L1/0071 ,  H04L25/067

摘要： “Reliability-related” values are assigned to received signal samples containing noise and distortion. The samples are then sent to a Viterbi decoder in order to regenerate originally transmitted messages.

摘要翻译： “可靠性相关”值分配给包含噪声和失真的接收信号样本。 然后将样本发送到维特比解码器，以便重新生成最初发送的消息。

公开(公告)号：US20050099938A1

公开(公告)日：2005-05-12

申请号：US10636161

申请日：2003-08-07

申请人： Mohsen Sarraf ,  Mohammad Zarrabizadeh

发明人： Mohsen Sarraf ,  Mohammad Zarrabizadeh

IPC分类号： H04B1/66 ,  H04J11/00

CPC分类号： H04B1/667 ,  H04H2201/18

摘要： A method and apparatus are disclosed for increasing the time and frequency diversity of a multi-stream signal in a DAB system. A plurality of audio streams are divided into four (4) digital sub-streams, C00, C01, C10, and C11. Each sub-stream C00, C01, C10, and C11 is assigned a unique frequency band, and time slot. A first core sub-stream C10 is mapped to one frequency partition and a second core sub-stream C00 is mapped to another frequency partition and delayed relative to the first core sub-stream. Similarly, two enhancement sub-streams C11 and C01 are mapped to different frequency partitions and are time delayed relative to each other and the core sub-streams. The two core sub-streams C00 and C10 can have a maximum separation across both the time and frequency axes. Each core sub-stream C00 and C10 is separate from one of the enhancement sub-streams in the frequency domain and separate in the time domain from the other enhancement sub-stream. Each core sub-stream C00 and C10 can be combined with any other available core or enhancement sub-stream to form a 64 kbps PAC. In addition, a 96 kbps PAC can be obtained by combining the two core sub-streams C00 and C10 with one of the enhancement sub-streams C00 or C11. Finally, the combination of all four sub-streams produces a full-rate 128 kbps PAC.

摘要翻译： 公开了一种用于增加DAB系统中的多流信号的时间和频率分集的方法和装置。 多个音频流被分成四（4）个数字子流，C 00，C 01，C 10和C 10， SUB> 11 。 每个子流C 00，C 01，C 10和C 11分配了唯一的频带 ，和时间段。 第一核心子流C 10被映射到一个频率分区，并且第二核心子流C 00被映射到另一频率分区并相对于第一核延迟 子流。 类似地，两个增强子流C11和C01被映射到不同的频率分区，并且相对于彼此和核心子流是时间延迟的。 两个核心子流C 00和C 10可以在时间轴和频率轴之间具有最大间隔。 每个核心子流C 00和C 10 10与频域中的一个增强子流分离，并且在时域中与另一个增强子流分开， 流。 每个核心子流C 00和C 10可与任何其他可用的核心或增强子流组合以形成64kbps PAC。 另外，可以通过将两个核心子流C 00和C 10与增强子流C 00之一组合来获得96kbps PAC /或C 11。 最后，所有四个子流的组合产生全速率128kbps PAC。

公开(公告)号：US06625113B1

公开(公告)日：2003-09-23

申请号：US09386092

申请日：1999-08-30

申请人： Robert L. Cupo ,  Mohsen Sarraf ,  Mojtaba Shariat

发明人： Robert L. Cupo ,  Mohsen Sarraf ,  Mojtaba Shariat

IPC分类号： H04J1100

CPC分类号： H04L27/2655 ,  H04L7/007 ,  H04L27/2601 ,  H04L27/2607 ,  H04L27/2656

摘要： A receiver of digital information typically performs a frame synchronization finction to locate the beginning of a frame of within received information. Frame and interleaver synchronization functions are complex tasks to accomplish, and are made more so when transmitted information is subjected to harsh interference by the environment of the transmission media, e.g., wireless media. Such interference may be sufficiently minimized by filtering the band signal at the receiver in a simple manner to allow receiver processes to perform successfully frame synchronization and interleaver functions on the filtered signal, in which such filtering may be achieved using a simple bandpass filter. Although such filtering renders the received signal sufficiently clean to recover frame synchronization and interleaver signals, it nevertheless corrupts the information carried in the signal, thereby making it extremely difficult to recover the information. This problem is overcome by shifting the unfiltered received signal in the way used to shift the filtered signal to locate the beginning of a frame and thus recover the underlying information.

摘要翻译： 数字信息的接收机通常执行帧同步功能以定位接收的信息内的帧的开始。 帧和交织器同步功能是完成的复杂任务，并且当传输的信息受到诸如无线媒体之类的传输媒体的环境的苛刻干扰时更加如此。 通过以简单的方式对接收机处的频带信号进行滤波可以充分地减小这种干扰，以允许接收机处理在滤波信号上执行成功的帧同步和交织器功能，其中可以使用简单的带通滤波器来实现这种滤波。 虽然这种过滤使接收到的信号足够清洁以恢复帧同步和交织器信号，但是它仍然破坏信号中携带的信息，从而使得恢复信息非常困难。 通过以用于移位滤波信号的方式移位未滤波的接收信号来定位帧的开始并因此恢复基础信息来克服该问题。

公开(公告)号：US06590945B1

公开(公告)日：2003-07-08

申请号：US09353009

申请日：1999-07-13

申请人： Nima Brardjanian ,  Yong J. Lee ,  Walid E. Nabhane ,  Mohsen Sarraf ,  Sheng-Jen Tsai

发明人： Nima Brardjanian ,  Yong J. Lee ,  Walid E. Nabhane ,  Mohsen Sarraf ,  Sheng-Jen Tsai

IPC分类号： H03D302

CPC分类号： H04L27/2332 ,  H04L2027/0046

摘要： A simplified method for frequency offset estimation in a TDMA cellular PCS environment using &pgr;/4-shifted DQPSK comprises the steps of multiplying a complex conjugate of a received complex-valued symbol and a succeeding symbol to produce a comparison vector having an angle equal to the phase angle between the received complex-valued symbol and the succeeding symbol, rotating the comparison vector so that the angle thereof is between 0° and 90°, and estimating the frequency offset by determining a constant deviation of the phase angle from an ideal phase angle value of 45° by calculating an average phase angle for a plurality of successive comparison vectors or correlating the rotated comparision vector against a bank of unit vectors to determine a maximum correlation.

摘要翻译： 使用π/ 4移位DQPSK的TDMA蜂窝PCS环境中的频率偏移估计的简化方法包括以下步骤：将接收的复值符号和后续符号的复共轭相乘以产生具有等于 接收的复值符号和后续符号之间的相位角，旋转比较矢量使其角度在0°和90°之间，并且通过确定相位角与理想相位角的恒定偏差来估计频率偏移 通过计算多个连续比较矢量的平均相位角，或将旋转的比较矢量与单位向量组相关联以确定最大相关性，来确定45°的值。

公开(公告)号：US06377566B1

公开(公告)日：2002-04-23

申请号：US09049985

申请日：1998-03-30

申请人： Robert Louis Cupo ,  Mohsen Sarraf ,  Mojtaba Shariat ,  Mohammad Hossein Zarrabizadeh

发明人： Robert Louis Cupo ,  Mohsen Sarraf ,  Mojtaba Shariat ,  Mohammad Hossein Zarrabizadeh

IPC分类号： H04J102

CPC分类号： H04H20/44 ,  H04H20/72 ,  H04H2201/183 ,  H04H2201/20 ,  H04L5/023

摘要： An OFDM subcarrier method and apparatus effectively reassigns subcarriers with respect to a data stream from a plurality of Digital Audio Broadcast (DAB) services or programs to reduce selective effects (e.g., selective channel fading) of the transmission channel (e.g., an FM station) on some of the DAB services or programs but not on others. In one embodiment, a symbol reassignment encoder at the transmitter shuffles the data or symbols in the data stream from the DAB services to effectively reassign the subcarriers used by each of the DAB services. The reassignment spreads the selective effects of the transmission channel, e.g., channel fading, over a larger group of DAB services, to improve the robustness and quality of the overall transmission channel.

摘要翻译： OFDM子载波方法和装置相对于来自多个数字音频广播（DAB）服务或程序的数据流有效地重新分配副载波，以减少传输信道（例如FM站）的选择性效应（例如，选择性信道衰落） 在一些民建联的服务或计划，而不是其他。 在一个实施例中，发射器处的符号重新分配编码器将来自DAB服务的数据流中的数据或符号混洗，以有效地重新分配由每个DAB服务使用的子载波。 重新分配扩展传输信道的选择性效应，例如，信道衰落，在更大的DAB服务组上，以提高整体传输信道的鲁棒性和质量。