公开(公告)号：US5896414A

公开(公告)日：1999-04-20

申请号：US718075

申请日：1996-09-17

申请人： Thomas John Meyer ,  Bruce James Anderson ,  Tianmin Liu

发明人： Thomas John Meyer ,  Bruce James Anderson ,  Tianmin Liu

IPC分类号： H04L29/10 ,  H04H20/38 ,  H04H60/93 ,  H04L5/14 ,  H04L29/08 ,  H04M3/00 ,  H04N7/173 ,  H04N21/226 ,  H04N21/2383 ,  H04N21/239 ,  H04N21/24 ,  H04N21/437 ,  H04N21/438 ,  H04N21/658 ,  H04B1/38 ,  H04L5/16

CPC分类号： H04H20/38 ,  H04L5/14 ,  H04N21/226 ,  H04N21/2383 ,  H04N21/239 ,  H04N21/2408 ,  H04N21/437 ,  H04N21/4382 ,  H04N21/6581 ,  H04N7/17309 ,  H04H60/93

摘要： In a information distribution system, a control channel modem that provides independent communications channels for bi-directional message traffic between a service provider and a set-top terminal located within a subscriber's home. The modem transmits messages, control information and status information between the service provider and the subscriber's set-top terminal using an independent channel (downstream path) that is different from the channel (upstream path) used for sending requested information such as movies from the service provider to the subscriber's home.

摘要翻译： 在信息分发系统中，控制信道调制解调器为服务提供商和位于用户家中的机顶终端之间的双向消息业务提供独立的通信信道。 调制解调器使用与用于发送所请求的信息（例如来自服务的电影）的信道（上游路径）不同的独立信道（下游路径）在服务提供商和订户的机顶终端之间发送消息，控制信息和状态信息 提供者到用户的家。

公开(公告)号：US20110002242A9

公开(公告)日：2011-01-06

申请号：US10386795

申请日：2003-03-12

申请人： Randall Perlow ,  Nabil Yousef ,  Charles Brooks ,  Tianmin Liu

发明人： Randall Perlow ,  Nabil Yousef ,  Charles Brooks ,  Tianmin Liu

IPC分类号： H04B7/005

CPC分类号： H04L25/0218 ,  H04L25/03057 ,  H04L25/03987 ,  H04L2025/0349 ,  H04L2025/03617 ,  H04L2025/0377

摘要： Sparse channel equalization may be achieved by receiving a signal via a multi-path communication channel. The equalization then continues by extracting sparse information regarding the multiple path communication channel from the signal. Such sparse information generally indicates the position of the signals received via each of the multiple paths. The equalization then continues by estimating a channel response of the multiple path communication channel based on the sparse information. The equalization then continues by generating equalization taps (or coefficients) based on the channel response. The equalization then continues by equalizing the signal based on the equalization taps.

摘要翻译： 可以通过经由多径通信信道接收信号来实现稀疏信道均衡。 然后通过从信号中提取关于多路径通信信道的稀疏信息来继续均衡。 这种稀疏信息通常表示通过多路径中的每一条接收到的信号的位置。 然后通过基于稀疏信息估计多路径通信信道的信道响应来继续均衡。 然后通过基于信道响应产生均衡抽头（或系数）来继续均衡。 然后通过基于均衡抽头均衡信号来继续均衡。

公开(公告)号：US20070223563A1

公开(公告)日：2007-09-27

申请号：US11754866

申请日：2007-05-29

申请人： Randall Perlow ,  Charles Brooks ,  Steven Jaffe ,  Tianmin Liu

发明人： Randall Perlow ,  Charles Brooks ,  Steven Jaffe ,  Tianmin Liu

IPC分类号： H04B1/00

CPC分类号： H04L25/0224 ,  H04L27/0008 ,  H04L2025/03503

摘要： An adaptive receiver is disclosed for optimally receiving and processing signals. The receiver utilizes one or more memory blocks to store groups of incoming symbols. The groups of symbols are processed by a channel estimation subsystem to determine channel characteristics. The receiver determines the appropriate demodulation and decoding strategy to implement based on the determined channel characteristics. The receiver includes a plurality of demodulation and decoding schemes, one of which is selected based on the results of a channel estimation analysis.

摘要翻译： 公开了用于最佳地接收和处理信号的自适应接收机。 接收机利用一个或多个存储器块来存储输入符号组。 符号组由信道估计子系统处理以确定信道特性。 接收机根据确定的信道特性确定适当的解调和解码策略来实现。 接收机包括多个解调和解码方案，其中之一是基于信道估计分析的结果来选择的。

公开(公告)号：US07224726B2

公开(公告)日：2007-05-29

申请号：US10109496

申请日：2002-03-28

申请人： Randall Perlow ,  Charles Brooks ,  Steven Jaffe ,  Tianmin Liu

发明人： Randall Perlow ,  Charles Brooks ,  Steven Jaffe ,  Tianmin Liu

IPC分类号： H04H7/40

CPC分类号： H04L25/0224 ,  H04L27/0008 ,  H04L2025/03503

摘要： An adaptive receiver is disclosed for optimally receiving and processing signals. The receiver utilizes one or more memory blocks to store groups of incoming symbols. The groups of symbols are processed by a channel estimation subsystem to determine channel characteristics. The receiver determines the appropriate demodulation and decoding strategy to implement based on the determined channel characteristics. The receiver includes a plurality of demodulation and decoding schemes, one of which is selected based on the results of a channel estimation analysis.

摘要翻译： 公开了用于最佳地接收和处理信号的自适应接收机。 接收机利用一个或多个存储器块来存储输入符号组。 符号组由信道估计子系统处理以确定信道特性。 接收机根据确定的信道特性确定适当的解调和解码策略来实现。 接收机包括多个解调和解码方案，其中之一是基于信道估计分析的结果来选择的。

公开(公告)号：US07034893B2

公开(公告)日：2006-04-25

申请号：US09923676

申请日：2001-08-06

申请人： Tianmin Liu ,  Randall B. Perlow

发明人： Tianmin Liu ,  Randall B. Perlow

IPC分类号： H04N5/44

CPC分类号： H04N5/4401 ,  H04L1/0045 ,  H04L25/03057 ,  H04L27/06 ,  H04L2025/03426 ,  H04N5/211

摘要： A digital television signal is intercepted by a plurality of antennas to produce a corresponding plurality of input signals. The antennas have different directionality so they can be combined in a way that reduces multipath echoes. In one embodiment, the antennas are arranged to operate in a diversity or scanned array mode. In another embodiment, the antennas are arranged to operate in a adaptive phased array mode. The input signals intercepted by the antenna are subjected to vestigial sideband (VSB) processing to produce a single VSB processed signal, which is decoded to form a display drive signal. A plurality of input signals in a VSB receiver having a plurality of antennas with different directionality are evaluated to determine how the input signals should be combined to reduce multipath echoes. The quality of the input signals from the antennas is evaluated at one of a number of different points in the VSB receiver, such as at the outputs of the antennas, the outputs of the VSB processors, or the output of the forward error correction (FEC) decoder. Within the VSB processors themselves, the quality of the input signals can be evaluated at a number of different points, including the outputs at the front end, the outputs at the back end, or inside the back end the outputs at the feed forward equalizer.

公开(公告)号：US5648987A

公开(公告)日：1997-07-15

申请号：US216936

申请日：1994-03-24

申请人： Jian Yang ,  Chandrakant Bhailalbhai Patel ,  Tianmin Liu ,  Allen Le Roy Limberg

发明人： Jian Yang ,  Chandrakant Bhailalbhai Patel ,  Tianmin Liu ,  Allen Le Roy Limberg

IPC分类号： H03H15/00 ,  H03H17/00 ,  H03H21/00 ,  H04B3/04 ,  H04B7/005 ,  H04L7/02 ,  H04L7/08 ,  H04L25/03 ,  H04N5/21 ,  H04N7/015 ,  H04N7/08 ,  H04N7/081 ,  H04L27/01

CPC分类号： H04N5/211 ,  H04L25/03038 ,  H04L7/08

摘要： In response to a received carrier wave modulated in accordance with a digital signal, a digital radio receiver recovers in digital form a modulating signal that is at times subject to undesirable amounts of multipath distortion. This recovered modulating signal is applied as respective input signals to first and second finite-impulse-response (FIR) filters, each of an N-tap type, the taps of which are adaptively weighted. The first FIR filter responds to the modulating signal to supply an output signal in which multipath distortion is suppressed. The second FIR filter responds to the modulating signal to generate corrections for the tap weights of the first FIR filter, which corrections are generated more rapidly than can be done with a microprocessor of the type commonly known as a "digital signal processor" or "DSP". A digital comparator compares samples of the first FIR filter response to corresponding samples of an ideal response, thereby to generate updated tap weights for the second FIR filter.

摘要翻译： 响应于根据数字信号调制的接收载波，数字无线电接收机以数字形式恢复有时受到不希望量的多径失真的调制信号。 该恢复的调制信号作为相应的输入信号施加到第一和第二有限脉冲响应（FIR）滤波器，每个N抽头类型，其抽头被自适应加权。 第一FIR滤波器响应调制信号以提供抑制多径失真的输出信号。 第二FIR滤波器响应于调制信号以产生第一FIR滤波器的抽头权重的校正，该校正比通常称为“数字信号处理器”或“DSP”的微处理器更快地产生 “。 数字比较器将第一FIR滤波器响应的样本与理想响应的对应样本进行比较，从而为第二FIR滤波器生成更新的抽头权重。

公开(公告)号：US5461426A

公开(公告)日：1995-10-24

申请号：US108311

申请日：1993-08-20

申请人： Allen L. Limberg ,  Chandrakant B. Patel ,  Tianmin Liu

发明人： Allen L. Limberg ,  Chandrakant B. Patel ,  Tianmin Liu

IPC分类号： H04N5/21 ,  H04N7/04 ,  H04N7/081 ,  H04N11/24 ,  H04N7/08

CPC分类号： H04N7/081 ,  H04N11/008 ,  H04N5/211 ,  H04N7/04

摘要： A relatively low power phase-shift-keyed (PSK) subcarrier encoding digital information is admixed with composite video signal. The PSK subcarrier is at an odd multiple of half the scan line frequency of the composite video signal, and the symbol rate is at a multiple of the scan line frequency. The PSK subcarrier modulates the amplitude of a suppressed carrier which is the same frequency as the video carrier for the composite video signal and preferably is in quadrature phasing therewith. To reduce evidence of the PSK subcarrier in television picture generated from that composite video signal, the PSK subcarrier is interrupted after each of periods of one frame duration and repeated in anti-phase during the next period of one frame duration. This also provides a basis for separating the PSK subcarrier from static luminance signal components by bandpass frame-comb filtering. Preferably, in the scan lines of consecutive pairs of scan lines, the PSK subcarrier is repeated with phase reversal of the subcarrier between scan lines, and the chroma subcarrier is repeated. This provides a basis for separating PSK subcarrier from chroma subcarrier by lowpass line-comb filtering.

摘要翻译： 将相对较低功率的相移键控（PSK）副载波编码数字信息与复合视频信号相混合。 PSK副载波为复合视频信号的扫描线频率的一半的奇数倍，符号率为扫描线频率的倍数。 PSK副载波调制与复合视频信号的视频载波相同的频率的抑制载波的振幅，并且优选与其正交相位调制。 为了减少从该复合视频信号产生的电视图像中的PSK副载波的证据，PSK副载波在一个帧持续时间的每个周期之后被中断，并且在一个帧持续时间的下一个周期内被反相重复。 这还提供了通过带通帧梳状滤波将PSK副载波与静态亮度信号分量分离的基础。 优选地，在连续的扫描线对的扫描线中，通过扫描线之间的副载波的相位反复来重复PSK子载波，并且重复色度副载波。 这为通过低通线梳梳滤波分离PSK副载波与色副载波提供了基础。