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1. 发明授权

US06628722B1 Decoding technique in discrete multi-tone (DMT) based communications systems 失效
标题翻译：基于离散多音（DMT）的通信系统中的解码技术
公开(公告)号：US06628722B1
公开(公告)日：2003-09-30
申请号：US09100615
申请日：1998-06-19
申请人： Rajiv Laroia , Jin-Der Wang
发明人： Rajiv Laroia , Jin-Der Wang
IPC分类号： H04L7700
CPC分类号： H04L27/2602 , H04L1/08 , H04L27/2614 , H04L27/2624
摘要： In an Asymmetric Digital Subscriber Loop (ADSL) Discrete Multi-Tone (DMT) system, ADSL DMT equipment includes a decoder that operates on a received DMT signal representing Nf symbols/second, where N>1, to recover f symbols per second. In particular, the decoder decides each symbol value of the recovered signal as a function of values of a respective 2N symbol values from the received DMT signal.
摘要翻译：在非对称数字用户环路（ADSL）离散多音（DMT）系统中，ADSL DMT设备包括一个解码器，它对接收到的表示Nf个符号/秒的DMT信号进行操作，其中N≥1，每秒恢复f个符号。具体地，解码器根据接收到的DMT信号，将恢复信号的每个符号值作为2N个符号值的值的函数。

2. 发明授权

US5802079A Transmission system for digital audio broadcasting 失效
标题翻译：数字音频广播传输系统
公开(公告)号：US5802079A
公开(公告)日：1998-09-01
申请号：US628118
申请日：1996-04-04
申请人： Jin-Der Wang
发明人： Jin-Der Wang
IPC分类号： H04H20/57 , H04H20/72 , H04H40/27 , H04J3/06 , H04L27/18 , H04L7/00
CPC分类号： H04H20/57 , H04H20/72 , H04J3/0611 , H04L27/18 , H04H2201/20 , H04H40/27
摘要： A digital audio broadcasting (DAB) system includes a radio-frequency (RF) transmitter and a corresponding RF receiver that includes a frame detection circuit for providing a frame synchronization signal. The latter is used to inhibit a Reed-Solomon decoder from correcting data in any frame for which there was no synchronization.
摘要翻译：数字音频广播（DAB）系统包括射频（RF）发射机和相应的RF接收机，其包括用于提供帧同步信号的帧检测电路。后者用于禁止Reed-Solomon解码器在没有同步的任何帧中校正数据。

3. 发明授权

US5214656A Multiplexed coded modulation with unequal error protection 失效
标题翻译：具有不平等错误保护的多路编码调制
公开(公告)号：US5214656A
公开(公告)日：1993-05-25
申请号：US627156
申请日：1990-12-13
申请人： Hong Y. Chung , Jin-Der Wang , Lee-Fang Wei
发明人： Hong Y. Chung , Jin-Der Wang , Lee-Fang Wei
IPC分类号： H04B14/04 , H03M13/35 , H04L1/00 , H04L27/34 , H04N5/44 , H04N7/015 , H04N7/24 , H04N19/89
CPC分类号： H04L1/006 , H03M13/35 , H04L1/0003 , H04L1/0017 , H04L1/0065 , H04L1/0071 , H04L27/0008 , H04L27/3422 , H04L27/3427 , H04N19/89 , H04N5/4401 , H04N7/015 , H04N7/24 , H04L2001/0098 , H04N19/30
摘要： Unequal error protection is provided for an HDTV signal by separately coding each one of the classes of information in the HDTV signal by using a conventional coded modulation scheme and then time-division-multiplexing the various coded outputs for transmission. In particular, each class of information is separately coded by a 4-dimensional 8-state trellis code and a uniformly-spaced (QAM) signal constellation.

4. 发明授权

US07123651B2 Adaptable hybrid and selection method for ADSL modem data rate improvement 有权
标题翻译： ADSL调制解调器数据速率提升的适应性混合选择方法
公开(公告)号：US07123651B2
公开(公告)日：2006-10-17
申请号：US10209338
申请日：2002-07-31
申请人： Shirish A. Altekar , Jin-Der Wang , Louis Joseph Serrano
发明人： Shirish A. Altekar , Jin-Der Wang , Louis Joseph Serrano
IPC分类号： H04L5/16
CPC分类号： H04M11/062
摘要： A method of operating a modem generally comprising the steps of (A) transmitting an invalid signal from the modem at each of a plurality of settings for an echo cancelling hybrid of the modem, (B) calculating a plurality of merit values each in response to an echo signal received by the modem in response to the invalid signal, and (C) adjusting the echo cancelling hybrid to a particular setting of the settings determined from the merit values.
摘要翻译：一种操作调制解调器的方法，通常包括以下步骤：（A）在调制解调器的回波消除混合的多个设置中的每一个处从调制解调器发送无效信号，（B）响应于响应于无效信号由调制解调器接收的回波信号，以及（C）将回波消除混合调整到从优值确定的设置的特定设置。

5. 发明授权

US06519291B1 Reduction of interference in discrete multi-tone (DMT) based communications systems 失效
标题翻译：减少基于离散多音（DMT）的通信系统的干扰
公开(公告)号：US06519291B1
公开(公告)日：2003-02-11
申请号：US09017592
申请日：1998-02-03
申请人： Nuri Ruhi Dagdeviren , George John Kustka , Rajiv Laroia , Jin-Der Wang
发明人： Nuri Ruhi Dagdeviren , George John Kustka , Rajiv Laroia , Jin-Der Wang
IPC分类号： H04J100
CPC分类号： H04L5/023 , H04L5/143
摘要： An Asymmetric Digital Subscriber Loop (ADSL) Discrete Multi-Tone system has disjoint and adjacent upstream and downstream channels. During the training phase of an ADSL connection, an ADSL DMT transmitter first determines a round trip propagation delay by transmitting a ranging signal to a far-end ADSL endpoint. During the subsequent communications phase, the ADSL transmitter synchronizes transmission of DMT symbols to a reference clock. In addition, the cyclic extensions of each DMT symbol are increased as a function of the propagation delay.
摘要翻译：非对称数字用户环路（ADSL）离散多音系统具有不相交和相邻的上行和下行信道。在ADSL连接的训练阶段，ADSL DMT发射机首先通过将测距信号发送到远端ADSL端点来确定往返传播延迟。在随后的通信阶段，ADSL发射机将DMT符号的传输同步到参考时钟。此外，每个DMT符号的循环扩展作为传播延迟的函数增加。

6. 发明授权

US06331996B1 Channel synchronization and impulse sounding in the presence of frequency offset 失效
标题翻译：在频率偏移的情况下，通道同步和脉冲探测
公开(公告)号：US06331996B1
公开(公告)日：2001-12-18
申请号：US09086197
申请日：1998-05-28
申请人： Jenn-Shing Lin , Richard Rogoszewicz , Jin-Der Wang
发明人： Jenn-Shing Lin , Richard Rogoszewicz , Jin-Der Wang
IPC分类号： H04L2730
CPC分类号： H04L25/0226 , H04L2027/0065 , H04L2027/0095
摘要： A known training sequence of binary, pseudo random signals, PN, is received over the channel and correlated with a modified pseudo random sequence PN−1 in which the zeros of the known sequence PN have been mapped to −1. A transform of the correlator output will be observed to contain strong tones that indicate the degree of frequency offset. To facilitate synchronization in the presence of an unknown amount of frequency offset, the received signals may be rectified and the correlation step performed with the absolute value of the incoming signal to obtain new output samples. When the frequency offset is small its measurement is facilitated by modulating the incoming signals with a known, comparatively large frequency offset, before the correlation step to make sure that the overall frequency offset occurs around a frequency that is an integral multiple of the symbol rate divided by the number of symbols in the pseudo random sequence. After being compensated for the frequency offset, the received synchronization/sounding signal is used to sound the channel impulse response.
摘要翻译：通过信道接收二进制伪随机信号PN的已知训练序列，并将其与已知序列PN的零已映射到-1的经修改的伪随机序列PN-1相关联。将观察到相关器输出的变换，以包含指示频率偏移程度的强音调。为了在存在未知量的频率偏移的情况下促进同步，可以对接收的信号进行整流，并且用输入信号的绝对值执行相关步骤以获得新的输出采样。当频率偏移小时，通过在相关步骤之前用已知的相对较大的频率偏移调制输入信号来促进其测量，以确保总体频率偏移在分频符号速率的整数倍的频率周围出现通过伪随机序列中的符号数。在对频偏进行补偿之后，接收到的同步/探测信号用于发出信道脉冲响应。

7. 发明授权

US5822368A Developing a channel impulse response by using distortion 失效
标题翻译：通过使用失真来开发信道脉冲响应
公开(公告)号：US5822368A
公开(公告)日：1998-10-13
申请号：US628120
申请日：1996-04-04
申请人： Jin-Der Wang
发明人： Jin-Der Wang
IPC分类号： H03H17/00 , H04B1/10 , H04B1/64 , H04H20/46 , H04H20/72 , H04H40/27 , H04J11/00 , H04L25/03 , H03H7/30
CPC分类号： H04H20/46 , H04H40/27 , H04L25/03133 , H04H20/72 , H04H2201/20
摘要： A digital audio broadcasting (DAB) system includes a radio-frequency (RF) receiver that develops a characterization signal representative of a respective mobile communications channel as a precursor to estimating a channel impulse response. The latter is used to set coefficients of an equalizer of the receiver to compensate for distortion such as intersymbol interference. In generating the channel impulse response a Fast Fourier Transform (FFT) of the characterization signal is performed. The resulting FFT is then clipped such that frequency components above a predetermined upper threshold and less than a predetermined lower threshold are set to the respective threshold values. This allows coefficients for the equalizer to be generated such that the equalizer converges even in the presence of strong reflections in a mobile communications environment.
摘要翻译：数字音频广播（DAB）系统包括射频（RF）接收机，其形成表示相应的移动通信信道的表征信号，作为估计信道脉冲响应的前兆。后者用于设置接收机的均衡器的系数以补偿诸如符号间干扰的失真。在产生信道脉冲响应时，执行表征信号的快速傅里叶变换（FFT）。然后将所得到的FFT削减，使得高于预定上限阈值且小于预定下限阈值的频率分量被设置为相应的阈值。这允许产生用于均衡器的系数，使得即使在移动通信环境中存在强反射的情况下，均衡器也会收敛。

8. 发明授权

US5751774A Transmission system for digital audio broadcasting 失效
标题翻译：数字音频广播传输系统
公开(公告)号：US5751774A
公开(公告)日：1998-05-12
申请号：US628119
申请日：1996-04-04
申请人： Jin-Der Wang
发明人： Jin-Der Wang
IPC分类号： H04L27/18 , H03M13/27 , H04B1/64 , H04H20/46 , H04H20/72 , H04H40/27 , H04L7/08 , H04L25/03 , H04L7/00
CPC分类号： H04H20/46 , H04H40/27 , H04L25/03133 , H04H20/72 , H04H2201/20
摘要： A digital audio broadcasting (DAB) system includes a radio-frequency (RF) transmitter and a corresponding RF receiver. The RF transmitter formats a DAB signal into a sequence of frames, each frame having a header comprising a predefined grouping of psuedo-random number sequences comprising 100 symbols. Of these 100 symbols, 86 symbols of the header are used for frame synchronization and channel sounding (for characterization of a communications channel), while the remaining 14 symbols are used for interleaver and data synchronization in an interleaved fashion.
摘要翻译：数字音频广播（DAB）系统包括射频（RF）发射机和相应的RF接收机。 RF发射机将DAB信号格式化成帧序列，每帧具有包括包含100个符号的伪随机数序列的预定义分组的报头。在这100个符号中，标题的86个符号用于帧同步和信道探测（用于表征通信信道），而剩余的14个符号用于以交错方式进行交织和数据同步。

9. 发明授权

US5371762A Technique utilizing signal storing devices for cancelling signal dispersion 失效
标题翻译：利用信号存储装置消除信号色散的技术
公开(公告)号：US5371762A
公开(公告)日：1994-12-06
申请号：US877926
申请日：1992-05-04
申请人： Daniel Amrany , Jin-Der Wang
发明人： Daniel Amrany , Jin-Der Wang
IPC分类号： H04B1/10 , H04L25/03 , H04N5/21 , H04N5/44
CPC分类号： H04L25/03019 , H04L25/03987 , H04N5/211
摘要： A signal dispersion cancellation structure receives incoming signal samples at an incoming rate, stores these samples in a first memory and then writes these samples at a submultiple of the incoming rate into a plurality of second memories. Each second memory is associated with a finite impulse response (FIR) filter and the second memory samples are coupled to the associated FIR filter at the incoming rate. Advantageously, apparatus is also provided which enables any sample in a second memory to be provided to the associated FIR filter and outputted therefrom at a time related to the position of any signal dispersion.
摘要翻译：信号色散消除结构以传入速率接收输入信号样本，将这些样本存储在第一存储器中，然后将这些样本写入到多个第二存储器中。每个第二存储器与有限脉冲响应（FIR）滤波器相关联，并且第二存储器样本以进入速率耦合到相关联的FIR滤波器。有利地，还提供了使得能够在与任何信号色散的位置相关的时间将第二存储器中的任何样本提供给相关联的FIR滤波器并从其输出的装置。

10. 发明授权

US4980767A Technique for determining signal dispersion characteristics in communications systems 失效
标题翻译：确定通信系统信号色散特性的技术
公开(公告)号：US4980767A
公开(公告)日：1990-12-25
申请号：US494941
申请日：1990-03-14
申请人： Tzy-Hong Chao , Burton R. Saltzberg , Jin-Der Wang
发明人： Tzy-Hong Chao , Burton R. Saltzberg , Jin-Der Wang
IPC分类号： H04N17/00 , H04B1/76 , H04L25/03 , H04L27/233 , H04L27/38 , H04N5/21 , H04N7/015
CPC分类号： H04L27/2331 , H04L25/03133 , H04L27/38 , H04N5/211 , H04N7/015
摘要： The present invention covers the notion of determining signal dispersion characteristics, such as amplitude, phase and delay, by transmitting training sequences. More specifically, each sequence comprises a plurality of predetermined symbols and is transmitted two or more times. Detection of each training sequence is provided by a correlator at the receiver. This detection creates a signal peak for each training sequence at the output of the correlator. Between the peaks, a "quiet zone" is created which permits signal dispersion in this zone to be characterizerd with respect to amplitude, phase and delay. Two different quiet zones are utilized to resolve ambiguities which arise in determining the aforesaid signal dispersion characteristics.

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