公开(公告)号：WO1996029791A2

公开(公告)日：1996-09-26

申请号：PCT/US1996000193

申请日：1996-01-11

Applicant: MOTOROLA INC.

Inventor： MOTOROLA INC. ,  BRUCKERT, Eugene ,  LING, Fuyun ,  SEXTON, Thomas, Aloysius

IPC: H04J00/00

CPC classification number: G03C11/02 ,  G11B5/633

Abstract: A method and apparatus for improved offset frequency estimation includes in a first embodiment a receiver (100) for coherent reception of a signal having known reference information, the receiver including an extractor (106) for extracting the reference information (107) from the signal, and an offset frequency estimator (110). The offset frequency estimator (110) includes a filter (121) for filtering the reference information and outputting a filtered reference sequence; a correlator (122, 124) for correlating the filtered reference sequence against a predetermined reference signal to form correlation values; and a peak detector (126) for determining an offset frequency estimate (131) from the correlation values. Other embodiments are also shown.

Abstract translation: 一种用于改进的偏移频率估计的方法和装置包括在第一实施例中用于相干接收具有已知参考信息的信号的接收机（100），该接收机包括用于从信号中提取参考信息（107）的提取器（106） 和偏移频率估计器（110）。 偏移频率估计器（110）包括滤波器（121），用于对参考信息进行滤波并输出滤波后的参考序列; 相关器（122,124），用于将滤波的参考序列与预定的参考信号相关，以形成相关值; 和用于根据相关值确定偏移频率估计（131）的峰值检测器（126）。 还示出了其他实施例。

公开(公告)号：WO1996010879A1

公开(公告)日：1996-04-11

申请号：PCT/US1995009774

申请日：1995-07-31

Applicant: MOTOROLA INC.

Inventor： MOTOROLA INC. ,  LING, Fuyun ,  SEXTON, Thomas, A. ,  BRUCKERT, Gene

IPC: H04L27/30

CPC classification number: H04B1/7087 ,  H04B1/707 ,  H04B1/7117 ,  H04B2201/70703 ,  H04B2201/70705 ,  H04J3/0605 ,  H04L25/0202 ,  H04L27/2276

Abstract: A method and apparatus is provided for facilitating coherent communication reception. A received reference symbol coded spread-spectrum communication signal is despread with a spreading code to derive a stream of reference samples (152) and a stream of data samples (158). The channel response is estimated by utilizing the stream of reference samples (152). An offset frequency detector (443) determines an offset to be applied to the received signal via a frequency locked loop (456), while a timing control (176) compensates for slow timing drift and fast fading based on power estimates derived from the stream of reference samples (152) and/or the stream of data samples (158). A rate estimator determines the rate at which the information was encoded, and the rate information is used to optimize the timing control (176), frequency offset detector (443) and channel estimator (154). Thus an improved detection of estimated data symbols from the stream of received data samples (158) is provided.

Abstract translation: 提供了一种用于促进相干通信接收的方法和装置。 接收到的参考符号编码扩频通信信号用扩展码解扩，以导出参考样本流（152）和数据样本流（158）。 通过利用参考样本流来估计信道响应（152）。 偏移频率检测器（443）通过频率锁定环路（456）确定要施加到接收信号的偏移，而定时控制（176）根据从 参考样本（152）和/或数据样本流（158）。 速率估计器确定信息被编码的速率，速率信息用于优化定时控制（176），频率偏移检测器（443）和信道估计器（154）。 因此，提供了从接收数据样本流（158）中对估计数据符号进行改进的检测。

公开(公告)号：WO1994021065A1

公开(公告)日：1994-09-15

申请号：PCT/US1994001746

申请日：1994-02-16

Applicant: MOTOROLA INC.

Inventor： MOTOROLA INC. ,  LING, Fuyun

IPC: H04K01/00

CPC classification number: H04B7/0845 ,  H03M13/00 ,  H04B1/707 ,  H04L25/0228

Abstract: A method and apparatus is provided for encoding and decoding to facilitate coherent communication. In encoding, reference symbols are inserted into a stream of input data symbols (110) to form a reference coded stream of input data symbols (114). Subsequently, the reference coded stream of input data symbols are prepared for transmission over a communication channel by spreading the reference coded stream of input data symbols with a spreading code prior to transmission over the communication channel. In decoding, a received communication signal (120) is despread with a spreading code to derive a stream of reference samples (132) and a stream of data samples (138). The channel response is estimated by utilizing the stream of reference samples (132). Finally, an estimated data symbol is detected from the stream of data samples (138) by utilizing the estimated channel response.

Abstract translation: 提供了一种用于编码和解码以便于相干通信的方法和装置。 在编码中，将参考符号插入到输入数据符号流（110）中以形成输入数据符号（114）的参考编码流。 随后，准备输入数据符号的参考编码流，以在通过通信信道传输之前通过扩展输入数据符号的参考编码流进行传输。 在解码中，用扩展码对接收的通信信号（120）进行解扩，以导出参考样本流（132）和数据采样流（138）。 通过利用参考样本流（132）估计信道响应。 最后，通过利用估计的信道响应从数据样本流（138）检测估计的数据符号。

公开(公告)号：WO1994000926A1

公开(公告)日：1994-01-06

申请号：PCT/US1993005450

申请日：1993-06-09

Applicant: MOTOROLA INC.

Inventor： MOTOROLA INC. ,  LING, Fuyun

IPC: H04B07/216

CPC classification number: H04W52/228 ,  H04B1/707 ,  H04J13/004 ,  H04W52/225

Abstract: A method and apparatus is provided for estimating signal power. The estimating is accomplished by correlating (206) an input data vector (204) with a set of mutually orthogonal codes to generate a set of output values. The input data vector (204) consists of data samples of a received orthogonal coded signal (202). Each output value corresponds to a mesure of confidence that the input data vector is substantially similar to one of the orthogonal codes from within the set of mutually orthogonal codes. Finally, an estimate of the power of the received orthogonal coded signal is generated (208) as a nonlinear function of the set of output values.

Abstract translation: 提供了一种用于估计信号功率的方法和装置。 通过将输入数据向量（204）与一组相互正交的代码相关（206）来生成一组输出值来实现估计。 输入数据矢量（204）由接收到的正交编码信号（202）的数据样本组成。 每个输出值对应于置信度的计算，输入数据向量基本上类似于来自相互正交码集合内的正交码之一。 最后，产生（208）所接收的正交编码信号的功率的估计值作为该组输出值的非线性函数。

公开(公告)号：WO1993020629A1

公开(公告)日：1993-10-14

申请号：PCT/US1993002170

申请日：1993-03-12

Applicant: MOTOROLA, INC.

Inventor： MOTOROLA, INC. ,  LING, Fuyun

IPC: H04K01/00

CPC classification number: H04W52/12 ,  H04W52/08 ,  H04W52/225 ,  H04W52/36

Abstract: A method and apparatus is provided for maintaining received signal power levels at an average level when a signal power estimate is on average similar to the average of actually received signal power levels (P(n)). The maintaining of the received signal power levels is accomplished by generating an estimate of the power of a received signal. Subsequently, a difference signal is generated by subtracting the estimated received signal power from a predetermined reference signal power (Pref). Finally, a signal power control threshold is adjusted as a function of the difference signal (106).

公开(公告)号：WO1993010607A1

公开(公告)日：1993-05-27

申请号：PCT/US1992008294

申请日：1992-09-30

Applicant: MOTOROLA, INC.

Inventor： MOTOROLA, INC. ,  LONG, Guozhu ,  LING, Fuyun ,  EYUBOGLU, M., Vedat

IPC: H04J01/00

CPC classification number: H04B3/235 ,  H04B3/232

Abstract: A device and method utilize a linear feedback/feedforward configuration to estimate and cancel a listener echo wherein equalizer (202) and listener echo cancellation (204 and 208) units are jointly updated, allowing determination of an error signal once (204 and 208), in place of the former method of separate error signal determination for each of an equalizer and a listener echo canceller. An improved phase-correction scheme is utlized to compensate the frequency offset in the listener echo. The relationship between the listener echo and talker far echo is utilized to facilitate the listener echo cancellation.

Abstract translation: 一种设备和方法利用线性反馈/前馈配置来估计和消除收听者回声，其中均衡器（202）和收听者回声消除（204和208）单元被联合更新，允许确定一次错误信号（204和208） 代替均衡器和收听回波消除器中的每一个的单独的误差信号确定的前一种方法。 改进的相位校正方案被用来补偿收听者回波中的频率偏移。 听众回声和讲话者远端回声之间的关系被用来促进听众回声消除。

公开(公告)号：EP0830770B1

公开(公告)日：2005-07-20

申请号：EP97905569.6

申请日：1997-01-15

Applicant: MOTOROLA, INC.

Inventor： WANG, Michael, Mao ,  LING, Fuyun ,  STEWART, Kenneth, A.

IPC: H04L27/06 ,  H04J3/22 ,  G06F11/10 ,  H04L1/00 ,  H04L25/02

CPC classification number: H04L1/208 ,  H04B2201/70705 ,  H04L1/0046 ,  H04L1/0054 ,  H04L1/20 ,  H04L25/0262

公开(公告)号：EP0830770A1

公开(公告)日：1998-03-25

申请号：EP97905569.0

申请日：1997-01-15

Applicant: MOTOROLA, INC.

Inventor： WANG, Michael, Mao ,  LING, Fuyun ,  STEWART, Kenneth, A.

IPC: H04J13 ,  H03M13 ,  H04L1 ,  H04L25 ,  H04Q7 ,  H04B1

CPC classification number: H04L1/208 ,  H04B2201/70705 ,  H04L1/0046 ,  H04L1/0054 ,  H04L1/20 ,  H04L25/0262

Abstract: A receiver (500) utilizes parameters generated by a Viterbi decoder (530) to determine one of a plurality of coding rates in which user information is transmitted. The receiver (500) combines the parameters in a predetermined manner, the result of which is a detection statistic (dij). By utilizing the detection statistic (dij), the coding rate at which user information is transmitted is accurately determined.

公开(公告)号：EP0670090A1

公开(公告)日：1995-09-06

申请号：EP94924500.0

申请日：1994-07-25

Applicant: MOTOROLA, INC.

Inventor： LING, Fuyun

IPC: H04B1 ,  H04B7 ,  H04B17 ,  H04J13

CPC classification number: H04W52/04 ,  H04B17/327

Abstract: A method and apparatus is provided for estimating signal power. This is accomplished by demodulating a received communication signal to derive a stream of samples. These samples may consist of either reference samples (132), data samples (142), or a combination thereof. An estimate of the power (118) of the received communication signal is then generated as a function of the stream of samples (144). The signal power estimate (148) may, for example, be used in a power control algorithm by setting a power control indicator (121), in response to a comparison between the signal power estimate and a predetermined threshold. Subsequently, the power control indicator (171) is transmitted over a communication channel to another communication unit. The communication unit detects a power control indicator (171) within a signal (120) received from over the communication channel and adjusts a particular signal transmission power of a signal transmitter in response to the detected power control indicator (171).

公开(公告)号：EP0587641A1

公开(公告)日：1994-03-23

申请号：EP92911134.0

申请日：1992-04-29

Applicant: MOTOROLA, INC.

Inventor： LING, Fuyun ,  LABEDZ, Gerald, P.

IPC: H04J3 ,  H04L7 ,  H04L27 ,  H04L25

CPC classification number: H04L27/2332 ,  H04L25/0212 ,  H04L2027/003 ,  H04L2027/0057 ,  H04L2027/0067 ,  H04L2027/0095

Abstract: La présente invention concerne un procédé et un appareil permettant de compenser le décalage des fréquences porteuses dans un système de communication à accès multiple à répartition dans le temps (AMRT). Dans ce but, un récepteur AMRT est adapté pour recevoir, par l'intermédiaire d'un canal de transmission, une rafale de signaux transmise qui comprend une configuration de signal de synchronisation, une portion d'un signal message et au moins une portion connue dans un intervalle de temps AMRT. A l'origine, une erreur de phase dans la portion du signal reçu qui correspond à la portion connue du signal transmis est déterminée. Ensuite, les divers paramètres du signal reçu sont ajustés de manière à éliminer l'erreur de phase et de compenser tout décalage des fréquences porteuses.