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1. 发明申请

WO1998027683A2 RETURN CHANNEL PROCESSING FOR A DIGITAL DATA COMMUNICATIONS SYSTEM 审中-公开
标题翻译：数字数据通信系统的返回信道处理
公开(公告)号：WO1998027683A2
公开(公告)日：1998-06-25
申请号：PCT/US1997022668
申请日：1997-12-10
申请人： THOMSON CONSUMER ELECTRONICS, INC.
发明人： THOMSON CONSUMER ELECTRONICS, INC. , KNUTSON, Paul, Gothard , McNEELY, David, Lowell
IPC分类号： H04L05/14
CPC分类号： H04L5/1461
摘要： A user/subscriber set-top unit (42, 44) in a satellite TV system is associated with a modem (30) coupled to an input optical fiber interface network (12) via a relatively high attenuation unshielded twisted pair (UTP) link (24). The modem demodulates (36) a UTP-attenuated, CAP 16 modulated downstream main signal, and generates (38) a higher energy QPSK modulated upstream return signal. Return signal interference in the received main signal is attenuated (34) by subtracting a delayed, phase adjusted version of the modulated return signal from the main signal before the main signal is demodulated. Interference cancellation is accomplished by using a subtraction process rather than by using a frequency selective filtering process. Interference cancellation may also be accomplished (22) in the interface network (12) preceding the UTP link.
摘要翻译：卫星电视系统中的用户/订户机顶单元（42,44）经由相对较高的衰减非屏蔽双绞线（UTP）链路（UTP）链接到耦合到输入光纤接口网络（12）的调制解调器（30） 24）。调制解调器解调（36）UTP衰减的CAP 16调制的下行主信号，并产生（38）较高能量QPSK调制的上行返回信号。通过在主信号被解调之前从主信号中减去调制返回信号的延迟相位调整版本，衰减（34）接收到的主信号中的返回信号干扰。通过使用减法处理而不是使用频率选择滤波处理来实现干扰消除。也可以在UTP链路之前的接口网络（12）中完成干扰消除（22）。

2. 发明申请

WO1998012836A1 COMPONENT TIMING RECOVERY SYSTEM FOR QAM 审中-公开
标题翻译：用于QAM的组件时序恢复系统
公开(公告)号：WO1998012836A1
公开(公告)日：1998-03-26
申请号：PCT/US1997015888
申请日：1997-09-08
申请人： THOMSON CONSUMER ELECTRONICS, INC.
发明人： THOMSON CONSUMER ELECTRONICS, INC. , KNUTSON, Paul, Gothard , RAMASWAMY, Kumar , McNEELY, David, Lowell
IPC分类号： H04L07/02
CPC分类号： H04L7/0029 , H04L7/0335 , H04L27/38
摘要： A receiver for a transmitted quadrature amplitude modulated (QAM) signal representing successive symbols, and including an in-phase (I) component and a quadrature (Q) component. A timing recovery system includes a source of samples (102) representing the QAM signal produced at a fixed frequency. Processing circuitry for the I component includes a first demodulator (104), coupled to the sample source, for demodulating the I component of the QAM signal to baseband; and a first interpolator (108), responsive to a control signal, for producing I component samples taken at times synchronized to the transmitted symbols. Processing circuitry for the Q component includes a second demodulator (114), also coupled to the sample source, for demodulating the Q component of the QAM signal to baseband; and a second interpolator (118), responsive to a control signal, for producing Q component samples taken at times synchronized to the transmitted symbols. A phase error detector (126) detects the phase error between the sample times of the I and Q component samples from the first and second interpolators and times of the successive transmitter symbols. A summer (130) is coupled to the phase error detector and a source of a nominal delay signal. A numerically controlled delay circuit (132), is coupled to the summer, for producing the respective control signals for the first and second interpolators.
摘要翻译：用于发送的正交幅度调制（QAM）信号的接收机，其表示连续符号，并且包括同相（I）分量和正交（Q）分量。定时恢复系统包括表示以固定频率产生的QAM信号的样本源（102）。用于I分量的处理电路包括耦合到采样源的用于将QAM信号的I分量解调为基带的第一解调器（104）以及响应于控制信号的第一内插器（108），用于产生在与发送的符号同步的时间采集的I分量样本。用于Q分量的处理电路包括还耦合到采样源的第二解调器（114），用于将QAM信号的Q分量解调为基带; 以及响应于控制信号的第二内插器（118），用于产生在与发送的符号同步的时间采集的Q分量样本。相位误差检测器（126）检测来自第一和第二内插器的I和Q分量采样的采样时间与连续发射机符号的时间之间的相位误差。夏季（130）耦合到相位误差检测器和标称延迟信号的源。数字控制延迟电路（132）耦合到加法器，用于产生用于第一和第二内插器的相应控制信号。

3. 发明公开

EP0927472A1 COMPONENT TIMING RECOVERY SYSTEM FOR QAM 失效
标题翻译：组件行程回收系统QAM
公开(公告)号：EP0927472A1
公开(公告)日：1999-07-07
申请号：EP97940933.0
申请日：1997-09-08
申请人： THOMSON CONSUMER ELECTRONICS, INC.
发明人： KNUTSON, Paul, Gothard , RAMASWAMY, Kumar , McNEELY, David, Lowell
IPC分类号： H04L7 , H04L27
CPC分类号： H04L7/0029 , H04L7/0335 , H04L27/38
摘要： A receiver for a transmitted quadrature amplitude modulated (QAM) signal representing successive symbols, and including an in-phase (I) component and a quadrature (Q) component. A timing recovery system includes a source of samples (102) representing the QAM signal produced at a fixed frequency. Processing circuitry for the I component includes a first demodulator (104), coupled to the sample source, for demodulating the I component of the QAM signal to baseband; and a first interpolator (108), responsive to a control signal, for producing I component samples taken at times synchronized to the transmitted symbols. Processing circuitry for the Q component includes a second demodulator (114), also coupled to the sample source, for demodulating the Q component of the QAM signal to baseband; and a second interpolator (118), responsive to a control signal, for producing Q component samples taken at times synchronized to the transmitted symbols. A phase error detector (126) detects the phase error between the sample times of the I and Q component samples from the first and second interpolators and times of the successive transmitter symbols. A summer (130) is coupled to the phase error detector and a source of a nominal delay signal. A numerically controlled delay circuit (132), is coupled to the summer, for producing the respective control signals for the first and second interpolators.

4. 发明授权

EP0927472B1 COMPONENT TIMING RECOVERY SYSTEM FOR QAM 失效
标题翻译：组件行程回收系统QAM
公开(公告)号：EP0927472B1
公开(公告)日：2005-05-11
申请号：EP97940933.1
申请日：1997-09-08
申请人： THOMSON CONSUMER ELECTRONICS, INC.
发明人： KNUTSON, Paul, Gothard , RAMASWAMY, Kumar , McNEELY, David, Lowell
IPC分类号： H04L7/02 , H04L27/38
CPC分类号： H04L7/0029 , H04L7/0335 , H04L27/38

5. 发明公开

EP0993703A1 OPPOSITE POLARIZATION INTERFERENCE CANCELLATION IN SATELLITE COMMUNICATION 失效
标题翻译：抑制性正交偏振干扰信号的卫星通信系统
公开(公告)号：EP0993703A1
公开(公告)日：2000-04-19
申请号：EP98934156.5
申请日：1998-06-19
申请人： THOMSON CONSUMER ELECTRONICS, INC.
发明人： KNUTSON, Paul, Gothard , RAMASWAMY, Kumar , McNEELY, David, Lowell
IPC分类号： H04B1/12 , H04B7/185
CPC分类号： H04B7/18513 , H04B1/126
摘要： A system for receiving a plurality of broadcast channels transmitted with different polarizations includes a first demodulator for demodulating a first channel having a first polarization to produce a first demodulated channel signal, and a second demodulator for demodulating a second channel having a second polarization, opposite to the first polarization, to produce a second demodulated channel signal. An adaptive interference cancellation network, coupled to the first and second demodulators, cancels interference, derived from the second channel, in the first demodulated channel signal to produce a received signal.

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