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公开(公告)号：US06870892B2
公开(公告)日：2005-03-22
申请号：US10409371
申请日：2003-04-09
CPC分类号： H04L27/066 , H04B7/0848 , H04L7/0029 , H04L7/005 , H04L2027/003 , H04L2027/0057
摘要： First and second RF signals in the respective first and second channels of a multiple channel diversity receiver are processed jointly in a joint timing loop filter for baud clock recovery. The channel with the stronger signal determines the frequency of the baud clock for the channel with the weaker signal, leaving the respective PLL's to make individual phase adjustments for each channel. The first and second channels also share a skew corrector for baud clock recovery when the multipath delay between the first and second RF signals is greater than one whole baud clock period. The whole baud skew corrector computes the correlation between the first and second received signals, and if the correlation is low, shifts the first and second signals by one whole baud and recomputes the correlation. The process of shifting the first and second received signals and computing the correlation function is repeated for various whole baud shifts in accordance with a search strategy to find the best (highest) correlation.
摘要翻译： 在多信道分集接收机的相应第一和第二信道中的第一和第二RF信号在用于波特率时钟恢复的联合定时环路滤波器中联合处理。 具有较强信号的通道确定信号较弱信号的波特率时钟频率，使相应的PLL对每个通道进行各自的相位调整。 当第一和第二RF信号之间的多径延迟大于一个整个波特率时钟周期时，第一和第二通道还共享用于波特率恢复的偏斜校正器。 整个波特率偏差校正器计算第一和第二接收信号之间的相关性，如果相关性低，则将第一和第二信号移位一整个波特，并重新计算相关性。 根据搜索策略重复针对各种整个波特移位来移动第一和第二接收信号并计算相关函数的过程以找到最佳（最高）相关性。
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公开(公告)号：US07006565B1
公开(公告)日：2006-02-28
申请号：US09549368
申请日：2000-04-14
IPC分类号： H03H21/00
CPC分类号： H04L25/03057 , H04L25/067 , H04L2025/03401 , H04L2025/0349 , H04L2025/03547
摘要： An equalizer for use in a communication receiver includes an infinite impulse response (IIR) feedback filter operated in acquisition and tracking feedback modes on a sample by sample basis to form a hybrid Decision Feedback Equalizer (DFE) architecture. In acquisition mode, soft decision samples from the filtered received signal are input to the IIR filter. In the tracking mode, hard decision samples from a slicer are input to the IIR filter. Acquisition and tracking operating modes are selected in accordance with a set of decision rules on a sample by sample basis based on the quality of the current hard decision. If the current hard decision is low quality, then the soft decision sample (acquisition mode) is used. If the current hard decision is high quality, then the hard decision sample (tracking mode) is used. In such manner, the DFE is operated in a hybrid mode, i.e., using both soft and hard decisions on a sample by sample basis. Furthermore, the decision rules that are responsive to signal reliability to select acquisition and tracking modes are adaptive.
摘要翻译： 用于通信接收机的均衡器包括无级冲激响应（IIR）反馈滤波器，其以采样和跟踪反馈模式在样本上进行操作，以形成混合的判决反馈均衡器（DFE）架构。 在采集模式下，滤波后的接收信号的软判决样本被输入到IIR滤波器。 在跟踪模式中，来自切片器的硬判决样本被输入到IIR滤波器。 根据当前硬判决的质量，根据抽样样本的一组决策规则选择采集和跟踪操作模式。 如果当前的硬判决质量较差，则使用软决策样本（采集模式）。 如果当前的硬判决是高质量的，那么使用硬判决样本（跟踪模式）。 以这种方式，DFE以混合模式操作，即，以样品为基础对样品进行软判断和硬判断。 此外，响应于信号可靠性以选择采集和跟踪模式的决策规则是自适应的。
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公开(公告)号：US06937677B2
公开(公告)日：2005-08-30
申请号：US10408881
申请日：2003-04-09
CPC分类号： H04L27/066 , H04B7/0848 , H04L7/0029 , H04L7/005 , H04L2027/003 , H04L2027/0057
摘要： Original RF carriers are recovered for first and second channels in a diversity receiver and used to de-rotate (demodulate) each of the first and second received signals. The pilot loop filters of each channel are cross coupled to create a joint pilot loop between both channels. The channel with the stronger signal provides a dominant influence on the frequency of the synthesized recovered RF carrier in the channel with the weaker signal. The phase locked pilot loops in both channels will tend to be frequency locked to the frequency of the stronger signal, leaving the respective phase locked pilot loops to make an individual phase adjustment for each channel.
摘要翻译： 原始RF载波在分集接收机中被恢复用于第一和第二信道，并用于去除（解调）第一和第二接收信号中的每一个。 每个通道的导频环路滤波器交叉耦合以在两个通道之间产生联合导频环路。 具有较强信号的信道对具有较弱信号的信道中的合成的恢复的RF载波的频率提供主要影响。 两个通道中的锁相导通环路将趋向于被锁定到较强信号的频率，从而使相应的锁相引导环路对每个通道进行单独的相位调整。
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公开(公告)号：US06560299B1
公开(公告)日：2003-05-06
申请号：US09363813
申请日：1999-07-30
IPC分类号： H04B710
CPC分类号： H04L27/066 , H04B7/0848 , H04L7/0029 , H04L7/005 , H04L2027/003 , H04L2027/0057
摘要： A diversity receiver is coupled to a composite antenna having first and second antennas physically configured to provide one or more forms of diversity reception. The multiple channel diversity receiver includes first and second RF channels with joint signal processing. First and second RF signals are processed jointly in the multiple channel diversity receiver with respect to tuning, automatic gain control (AGC), baud clock recovery, RF carrier recovery and forward equalization. The multiple channels of the diversity receiver are linked or cross coupled to each other through respective joint processing circuitry. In particular, first and second RF tuners share a common local oscillator and a common AGC feedback loop. First and second front ends share a common baud timing loop and a common pilot carrier recovery loop. Finally, first and second diversity receiver channels share a common sparse equalization filter. By processing first and second signals jointly in the diversity receiver, the receiver provides equal or superior performance to a single receiver processing only the best signal.
摘要翻译： 分集接收机耦合到复合天线，其具有物理地配置为提供一种或多种形式的分集接收的第一和第二天线。 多信道分集接收机包括具有联合信号处理的第一和第二RF信道。 关于调谐，自动增益控制（AGC），波特率时钟恢复，RF载波恢复和正向均衡，第一和第二RF信号在多信道分集接收机中联合处理。 分集接收机的多个信道通过相应的联合处理电路彼此链接或交叉耦合。 特别地，第一和第二RF调谐器共享公共本地振荡器和公共AGC反馈回路。 第一和第二前端共享一个通用的波特率定时回路和一个公共导频载波恢复回路。 最后，第一和第二分集接收机信道共享一个共同的稀疏均衡滤波器。 通过在分集接收机中联合处理第一和第二信号，接收机对仅处理最佳信号的单个接收机提供相等或优越的性能。
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5.发明授权公开(公告)号：US06970523B2
公开(公告)日：2005-11-29
申请号：US10384048
申请日：2003-03-07
CPC分类号： H04L27/066 , H04B7/0848 , H04L7/0029 , H04L7/005 , H04L2027/003 , H04L2027/0057
摘要： A multiple channel diversity receiver includes joint automatic gain control (AGC) signal processing wherein the first and second channels of the multiple channel diversity receiver share at least one joint AGC loop. The maximum difference between the AGC feedback signal in the control loop for the first channel and the AGC feedback control signal in the control loop for the second channel is limited to a selectable maximum differential. The AGC control loop with the stronger first RF signal thus limits the maximum amount that the weaker signal is amplified in the AGC control loop with the weaker second RF signal. By limiting the AGC feedback signal in the control loop of the second channel to a maximum differential with respect to the AGC feedback signal in the control loop of the first channel, the weaker signal is not overly amplified thereby avoiding the undue amplification of noise in the second channel.
摘要翻译： 多信道分集接收机包括联合自动增益控制（AGC）信号处理，其中多信道分集接收机的第一和第二信道共享至少一个联合AGC环路。 用于第一通道的控制回路中的AGC反馈信号与用于第二通道的控制回路中的AGC反馈控制信号之间的最大差值被限制为可选择的最大差分。 具有较强的第一RF信号的AGC控制环路限制了较弱信号在AGC控制环路中被放大的最大量，其中较弱的第二RF信号。 通过将第二通道的控制环路中的AGC反馈信号相对于第一通道的控制回路中的AGC反馈信号限制为最大差分，较弱的信号不会被过度放大，从而避免了噪声的过度放大 第二频道
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6.发明授权Equalizer method and apparatus using constant modulus algorithm blind equalization and partial decoding 失效均衡器方法和装置使用恒模算法盲均衡和部分解码公开(公告)号：US06668014B1
公开(公告)日：2003-12-23
申请号：US09457496
申请日：1999-12-09
申请人： Thomas J Endres , Samir N Hulyalkar , Christopher H Strolle , Troy A Schaffer , Raul A Casas , Stephen L Biracree , Anand M Shah
发明人： Thomas J Endres , Samir N Hulyalkar , Christopher H Strolle , Troy A Schaffer , Raul A Casas , Stephen L Biracree , Anand M Shah
IPC分类号： H03K5159
CPC分类号： H04L25/0307 , H04L2025/03375 , H04L2025/0349 , H04L2025/0363 , H04L2027/0046
摘要： A digital communication receiver includes a blind equalizer using the Constant Modulus Algorithm (CMA) to compensate for channel transmission distortion in digital communication systems. Improved CMA performance is obtained by using a partial trellis decoder to predict 1 bit or 2 bits of the corresponding 3-bit transmitted symbol. The predicted bits from the partial trellis decoder are used to reduce the effective number of symbols in the source alphabet, which reduces steady state jitter of the CMA algorithm. Specifically, the received input signal to the CMA error calculation is shifted up or down by a computed delta (&Dgr;), in accordance with the predicted bit(s). In addition, a different constant gamma (&ggr;), for the CMA error calculation is selected in accordance with the predicted bit(s). The disclosed technique is applicable to trellis and non-trellis codes in which at least one bit of the present symbol can be predicted in advance and used to reduce the effective number of symbols in the source alphabet.
摘要翻译： 数字通信接收机包括使用恒模算法（CMA）的盲均衡器来补偿数字通信系统中的信道传输失真。 通过使用部分网格解码器来预测相应的3位传输符号的1位或2位来获得改进的CMA性能。 来自部分网格解码器的预测位用于减少源字母表中符号的有效数量，这降低了CMA算法的稳态抖动。 具体地，根据预测的比特，将接收到的CMA误差计算的输入信号向上或向下移位计算的增量（Delta）。 另外，根据预测的比特来选择用于CMA误差计算的不同的恒定伽马（gamma）。 所公开的技术适用于网格和非格状码，其中可以预先预测当前符号的至少一个比特，并用于减少源字母表中的符号的有效数量。
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公开(公告)号：US06418164B1
公开(公告)日：2002-07-09
申请号：US09231888
申请日：1999-01-14
IPC分类号： H03H2100
CPC分类号： H04L27/01 , H04L2025/0342 , H04L2025/03624
摘要： An adaptive equalizer for use in blind equalization systems to compensate for transmission channel distortion and noise in a digital communication system uses multiple quantization levels for implementation of the Constant Modulus Algorithm (CMA). Different quantization levels are used in different regions of the CMA error function for both passband and baseband equalizers. In one embodiment, a quantizer with a step rise having logarithmic scale is used to digitize the CMA error function. In particular, a quantizer with a step rise in which each level of the quantizer step rise is a power of 2 is used to digitize the CMA error function. In another embodiment, a quantizer with a step rise in which each level of the quantizer step rise is the sum of two or more logarithmic scales is used to digitize the CMA error function. In particular, a quantizer with a step rise wherein each level of the quantizer step rise is the sum of two or more numbers each of which is a power of 2 is used to digitize the CMA error function. The use of logarithmic scales, the sum of logarithmic scales, powers of 2, or the sum of powers of 2 for the quantizer step rise size to digitize the CMA error function make efficient use of shift and add operations to achieve multiplication in the adaptation process.
摘要翻译： 用于盲均衡系统中用于补偿数字通信系统中的传输信道失真和噪声的自适应均衡器使用多个量化级来实现恒模算法（CMA）。 在通带和基带均衡器的CMA误差函数的不同区域中使用不同的量化电平。 在一个实施例中，使用具有对数刻度的阶梯升高的量化器来数字化CMA误差函数。 特别地，使用具有步长的量化器，其中量化器阶跃的每个级别上升为2的幂来数字化CMA误差函数。 在另一个实施例中，使用具有阶梯升高的量化器，其中量化器阶跃的每个电平升高是两个或更多个对数刻度的总和，以使CMA误差函数数字化。 特别地，具有阶梯升高的量化器，其中量化器阶跃上升的每个电平是两个或更多个数字之和，其中每个电平为2的幂用于数字化CMA误差函数。 使用对数刻度，对数刻度的总和，2的幂，或2的幂的总和，对于量化器步长上升大小来数字化CMA误差函数，有效地利用移位和相加运算来实现适应过程中的乘法 。
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公开(公告)号：US06337878B1
公开(公告)日：2002-01-08
申请号：US09261843
申请日：1999-03-03
IPC分类号： H03H740
CPC分类号： H04L25/0307 , H04L2025/03382 , H04L2025/0342 , H04L2025/0349 , H04L2025/0363
摘要： An adaptive equalizer for use in blind equalization systems to compensate for transmission channel distortion and noise in a digital communication system quantizes the input signal samples to generate a quantized implementation of the Constant Modulus Algorithm (CMA). To quantize the input signal samples, a nearest-element decision device (a slicer), that is typically present in a digital receiver, is used to pre-compute the quantized CMA error function. The number of unique values for the CMA error term is thereby reduced, and the reduced number of CMA error term values are stored in a lookup table. By greatly reducing the number of received signal values used in the CMA error calculation a relatively small lookup table can be used to compute the CMA error function. Passband implementation is accommodated by incorporating the signal de-rotation factor into the lookup table entries. In one embodiment the CMA multiply operation is replaced with shifts and adders. To make efficient use of shift and add operations to achieve multiplication in the adaptation process, the lookup table values are selected to be either a power of 2 or a minimal sum of powers of 2.
摘要翻译： 用于盲均衡系统中用于补偿数字通信系统中的传输信道失真和噪声的自适应均衡器量化输入信号样本以产生恒模算法（CMA）的量化实现。 为了量化输入信号样本，使用通常存在于数字接收机中的最近元素判定装置（分片器）来预先计算量化的CMA误差函数。 因此减少了CMA错误项的唯一值的数量，并且将减少的CMA错误项值的数量存储在查找表中。 通过大大减少在CMA误差计算中使用的接收信号值的数量，可以使用相对小的查找表来计算CMA误差函数。 通过将信号去旋转因子并入查找表条目来适应通带实现。 在一个实施例中，CMA乘法运算被替换为移位和加法器。 为了有效地利用移位和添加操作来实现适应过程中的乘法，查找表值被选择为2的幂或2的幂的最小和。
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公开(公告)号：US07194047B2
公开(公告)日：2007-03-20
申请号：US10251650
申请日：2002-09-20
CPC分类号： H04H20/28 , H04H20/57 , H04L1/0045 , H04L1/0057 , H04L1/006 , H04L1/0065 , H04L1/007 , H04L1/0071 , H04L7/0004 , H04L7/0062 , H04L7/0278 , H04L25/0307 , H04L27/04 , H04L27/066 , H04L2025/03382 , H04L2025/03598 , H04L2027/004 , H04L2027/0055 , H04L2027/0081
摘要： A robust data extension, added to a standard 8VSB digital television signal, is used to improve the performance of a digital television receiver. Robust data packets are encoded at a 1/3-trellis rate as compared to normal data packets that are encoded at a 2/3-trellis rate. In addition to delivery of robust data for mobile applications, the redundant robust data packets also improve the performance of the receiver in the normal tier of service. In particular, the robust data packets improve the performance of the receiver equalizer filter in the presence of rapidly changing transient channel conditions such as dynamic multipath for both robust data packets and normal data packets. The robust data packets improve the performance of the carrier recovery loop and the symbol timing recovery loop. Backward compatibility with existing receivers is maintained for 1) 8VSB signaling, 2) trellis encoding and decoding, 3) Reed Solomon encoding and decoding, and 4) MPEG compatibility.
摘要翻译： 增加到标准8VSB数字电视信号的强大的数据扩展被用于提高数字电视接收机的性能。 与以3/3网格编码的正常数据分组相比，强大的数据分组以1/3网格速率进行编码。 除了为移动应用提供强大的数据外，冗余的鲁棒数据包还可以提高接收机在正常服务级别中的性能。 特别地，鲁棒数据分组在存在快速变化的瞬态信道条件（诸如鲁棒数据分组和正常数据分组的动态多径）的情况下，提高了接收机均衡器滤波器的性能。 鲁棒的数据包提高了载波恢复环路和符号定时恢复环路的性能。 维护与现有接收机的向后兼容性1）8VSB信令，2）网格编码和解码，3）里德所罗门编码和解码，以及4）MPEG兼容性。
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