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1. 发明授权

EP0536948B1 Multidimensional trellis-coded modulation for fading channels 失效
标题翻译：多维网格编码调制为衰落信道
公开(公告)号：EP0536948B1
公开(公告)日：1997-12-17
申请号：EP92308948.6
申请日：1992-10-01
申请人： AT&T Corp.
发明人： Wei, Lee-Fang
IPC分类号： H04L27/18
CPC分类号： H04L27/186

2. 发明公开

EP0641110A1 Combined equaliser and demultiplexer 有权
标题翻译：制造商/解复用器。
公开(公告)号：EP0641110A1
公开(公告)日：1995-03-01
申请号：EP94306046.7
申请日：1994-08-17
申请人： AT&T Corp.
发明人： Wei, Lee-Fang
IPC分类号： H04L25/03 , H04J3/06
CPC分类号： H04J3/06 , H04L25/03044
摘要： A reduced speed equalizer is provided which receives signal samples at a first rate but performs the equalizing operation at a second, lower rate which is below the rate at which symbols are transmitted across the channel. The equalizer is clocked to receive samples in a shift register at the first rate. Samples stored in the shift register are clocked into a set of buffers at the second rate. The equalizer coefficients are applied to the samples stored in the buffer set to generate a sequence of equalized symbols at the second rate.
摘要翻译：提供了以第一速率接收信号采样的低速均衡器，但是以低于通过信道发送符号的速率的第二较低速率执行均衡操作。均衡器被计时以第一速率接收移位寄存器中的采样。存储在移位寄存器中的样本以第二速率计时到一组缓冲器。均衡器系数被施加到存储在缓冲器组中的样本以产生第二速率的均衡符号序列。

3. 发明公开

EP0566330A2 Multilevel coding using trellis-coded modulation and reed-solomon codes 失效
标题翻译： Mehrpegelkodierung mit Trellis-kodierter Modulation和Reed-Solomon-Koden。
公开(公告)号：EP0566330A2
公开(公告)日：1993-10-20
申请号：EP93302800.3
申请日：1993-04-08
申请人： AT&T Corp.
发明人： Wei, Lee-Fang
IPC分类号： H04L27/34
CPC分类号： H04L27/3433
摘要： A multilevel coded modulation scheme trellis encodes (in 112) a portion of the input data, and the resulting encoded stream is used (in 120) to identify a particular one of a predetermined number of subsets of symbols of a predetermined signal constellation. The remaining input data is coded using a Reed-Solomon (RS) code (in 114) whose output is used to select for transmission a particular symbol from the identified subset. In applications in which phase hits or other channel phenomena may cause the received signal points to be phase-rotated versions of the signal points that were transmitted, differential encoding is included in the overall coded modulation scheme. In different embodiments, the differential encoding/decoding and RS encoding/decoding are in different orders. In one such embodiment, overlapped multilevel codes are used to preserve the advantages afforded by taking a multilevel coding approach.
摘要翻译：多级编码调制方案网格编码（在112）输入数据的一部分，并且使用所得到的编码流（在120中）来识别预定数量的预定信号星座的符号子集中的特定一个。剩余的输入数据使用Reed-Solomon（RS）代码（在114中）进行编码，其输出用于从所识别的子集中选择传输特定符号。在相位匹配或其他通道现象可能导致接收到的信号点是被发送的信号点的相位旋转版本的应用中，差分编码被包括在总体编码调制方案中。在不同的实施例中，差分编码/解码和RS编码/解码是不同的顺序。在一个这样的实施例中，使用重叠的多级代码来保持通过采取多级编码方法所提供的优点。

4. 发明公开

EP0531046A3 Multi-subcarrier modulation for HDTV transmission 失效
标题翻译：用于高清电视传输的多节点调制
公开(公告)号：EP0531046A3
公开(公告)日：1993-06-23
申请号：EP92307802.6
申请日：1992-08-27
申请人： AT&T Corp.
发明人： Wei, Lee-Fang
IPC分类号： H04L5/06 , H04N7/13 , H04N7/08
CPC分类号： H04N21/2383 , H04L27/2604 , H04N7/015 , H04N7/0806 , H04N21/4382
摘要： The HDTV signal is divided into a plurality of information classes, which are each encoded with an individual level of error correction; and which are each transmitted on an individual subcarrier. The subchannel assignments depend upon noise and interference considerations.

5. 发明公开

EP0490552A2 Multiplexed coded modulation with unequal error protection 失效
标题翻译：多变量，kodierte调制。
公开(公告)号：EP0490552A2
公开(公告)日：1992-06-17
申请号：EP91311196.9
申请日：1991-12-02
申请人： AT&T Corp.
发明人： Chung, Hong Yang , Wang, Jun-Der , Wei, Lee-Fang
IPC分类号： H04L27/34 , H04N7/13
CPC分类号： H04L1/006 , H03M13/35 , H04L1/0003 , H04L1/0017 , H04L1/0065 , H04L1/0071 , H04L27/0008 , H04L27/3422 , H04L27/3427 , H04L2001/0098 , H04N5/4401 , H04N7/015 , H04N7/24 , H04N19/30 , H04N19/89
摘要： Unequal error protection is provided for an HDTV signal (101) by separately coding (in 120,130) each one of the classes of information (on 20,30) in the HDTV signal by using a conventional coded modulation scheme and then time-division-multiplexing (in 140) the various coded outputs for transmission.
摘要翻译：通过使用传统的编码调制方案，在HDTV信号中的每个信息类别（在20,30）上分别编码（在120,130中），然后进行时分复用，为HDTV信号（101）提供不相等的错误保护（140）各种编码输出进行传输。

6. 发明公开

EP0439925A2 Maximum likelihood decoding with interference detection for frequency-hopped coded modulation systems 失效
标题翻译： Maximalwahrscheinlichkeitsdekodierung mitStörungsdetektionfürFrequenzsprungsysteme mit kodierter Modulation。
公开(公告)号：EP0439925A2
公开(公告)日：1991-08-07
申请号：EP90312937.7
申请日：1990-11-28
申请人： AT&T Corp.
发明人： Saleh, Adel Abdel Moneim , Wei, Lee-Fang
IPC分类号： H04L1/02 , H03M13/22 , H04B1/66
CPC分类号： H04B1/715 , H04L27/186
摘要： In a wireless local area network, predetermined interference-detection sequences of signal points, known at both the transmitter and receiver, are transmitted over a plurality of hopping frequencies along with a sequence of data signal points taken from a modulated code exhibiting built-in diversity. In the receiver, the extent to which there are errors in the received interference-detection signal points is used as a mechanism for identifying the likely occurrence of strong interference. If there are no, or few, errors, decoding proceeds normally. However, if the number of errors is above a predetermined threshold, it is assumed that the transmitted signal was subjected to significant interference and an erasure is declared. This is used as "side" information by the decoder to improve its ability to accurately recover data in the presence of interference.
摘要翻译：在无线局域网中，在发射机和接收机两者已知的信号点的预定干扰检测序列与多个跳频一起发送，并且从表示内置分集的调制码中获取的数据信号点序列。在接收机中，使用接收到的干扰检测信号点存在错误的程度作为识别强干扰的可能发生的机制。如果没有或几个错误，解码正常进行。然而，如果错误的数量高于预定阈值，则假设发送的信号受到显着的干扰，并且声明了擦除。这被解码器用作“侧”信息，以提高其在存在干扰的情况下准确地恢复数据的能力。

7. 发明授权

EP0677966B1 Concatenated coded vestigial sideband modulation for high definition television 失效
标题翻译：级联编码残留边带调制的高清晰度电视信号
公开(公告)号：EP0677966B1
公开(公告)日：2008-06-25
申请号：EP95302241.5
申请日：1995-04-04
申请人： AT&T Corp.
发明人： Wei, Lee-Fang
IPC分类号： H04L27/02 , H04N7/24
CPC分类号： H04N21/2383 , H04L27/02 , H04N21/4382

8. 发明公开

EP0677966A3 Concatenated coded vestigial sideband modulation for high definition television 失效
标题翻译：级联编码残留边带调制的高清晰度电视信号。
公开(公告)号：EP0677966A3
公开(公告)日：1999-11-17
申请号：EP95302241.5
申请日：1995-04-04
申请人： AT&T Corp.
发明人： Wei, Lee-Fang
IPC分类号： H04N7/24
CPC分类号： H04N21/2383 , H04L27/02 , H04N21/4382
摘要： A modulation scheme for HDTV, for example, uses a concatenated code comprised of a Reed-Solomon coder (131) followed by an N-dimensional trellis coder (136) whose N-dimensional output symbols with N>1, are used to modulate a one-dimensional vestigial sideband modulator (15). Specifically, each N-dimensional symbol is a sequence of N one-dimensional signal points--specifically signal points of a one-dimensional VSB constellation.

9. 发明公开

EP0641101A2 Digital communications system with symbol multiplexers 失效
标题翻译：数字Nachrichtensystem mit符号多样性。
公开(公告)号：EP0641101A2
公开(公告)日：1995-03-01
申请号：EP94306047.5
申请日：1994-08-17
申请人： AT&T Corp.
发明人： Wei, Lee-Fang
IPC分类号： H04J15/00 , H04N7/00 , H04L27/34 , H04J7/00 , H04N7/24
CPC分类号： H04L1/0065 , H04J7/00 , H04L1/0057 , H04L1/006 , H04L25/03044 , H04L27/3427 , H04L27/3438
摘要： A cost-effective, bandwidth-efficient, and power-efficient system is provided in which data streams received from several different video sources are converted into sequences of symbols selected from a predetermined constellation and are multiplexed on a symbol-by-symbol basis into a single sequence of symbols for transmission on a channel. Using a symbol multiplexer helps to mitigate the effect of bursty noise in the receiver and reduces the processing speed requirement in the receiver.
摘要翻译：提供了一种具有成本效益，带宽效率和功率效率的系统，其中从多个不同视频源接收的数据流被转换成从预定星座中选择的符号序列，并且逐个符号地被复用到用于在信道上传输的单个符号序列。使用符号多路复用器有助于减轻接收机中突发噪声的影响，并降低接收机中的处理速度要求。

10. 发明公开

EP0485108A3 Coded modulation with unequal levels of error protection 失效
标题翻译：编码调制与不均匀级别的错误保护
公开(公告)号：EP0485108A3
公开(公告)日：1992-09-30
申请号：EP91310012.9
申请日：1991-10-30
申请人： AT&T Corp.
发明人： Wei, Lee-Fang
IPC分类号： H04L27/34 , H04N7/13
CPC分类号： H03M13/35 , H04L27/3422 , H04L27/3488 , H04L2001/0098 , H04N5/4401 , H04N7/08
摘要： Digital signals, such as digitized television signals, are subjected to a source coding step in which a class of "most important" data elements represents a proportionately greater amount of the information to be communicated than the rest of the data elements. This is followed by a constellation mapping step which is carried out in such a way that those data elements have a lower probability of being erroneously detected at the receiver than the others. The constellation mapping step uses coded modulation in order to provide enhanced noise immunity for the "most important" data element class.

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