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公开(公告)号：US07072999B1
公开(公告)日：2006-07-04
申请号：US09893101
申请日：2001-06-26
申请人： Philip DesJardins , Scott A. Lery , Carl Alelyunas
发明人： Philip DesJardins , Scott A. Lery , Carl Alelyunas
IPC分类号： G06F3/00
CPC分类号： H04L43/0858 , H04L2012/2845
摘要： A robust packet arrival time detector using a power estimate to validate a packet arrival time measurement. A packet arrival time measurement is considered valid when the value of the power estimate signal indicates that a packet is being received. A power estimator comprises a bandpass filter, a Hilbert transform, two squaring devices, an adder, and a lowpass filter.
摘要翻译： 强大的分组到达时间检测器，使用功率估计来验证分组到达时间测量。 当功率估计信号的值指示正在接收到分组时，分组到达时间测量被认为是有效的。 功率估计器包括带通滤波器，希尔伯特变换，两个平方器件，加法器和低通滤波器。
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公开(公告)号：US06874096B1
公开(公告)日：2005-03-29
申请号：US09887283
申请日：2001-06-21
CPC分类号： H04L7/042
摘要： A detector for detecting packet arrival time for packets received by a Home Phoneline Network Alliance (HPNA) receiver. The detector correlates received preamble symbols with stored preamble symbols and generates an estimation of the packet arrival time when the entire transmitted preamble has arrived at the receiver. The estimation of the packet arrival time is defined on a symbol period boundary. The detector includes a complex correlator with a simplified structure based on characteristic of the received HPNA signal.
摘要翻译： 用于检测由家庭电话网络联盟（HPNA）接收机接收到的分组的分组到达时间的检测器。 检测器将接收到的前导码符号与存储的前导码符号相关联，并且当整个发送的前导码到达接收机时产生对分组到达时间的估计。 分组到达时间的估计在符号周期边界上定义。 检测器包括基于所接收的HPNA信号的特性的具有简化结构的复相关器。
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公开(公告)号：US07813439B2
公开(公告)日：2010-10-12
申请号：US11348733
申请日：2006-02-06
申请人： Andy Norrell , Scott A. Lery , Philip Desjardins , Mike Behrin
发明人： Andy Norrell , Scott A. Lery , Philip Desjardins , Mike Behrin
IPC分类号： H04L23/02
CPC分类号： H04L25/03159 , H04L1/004 , H04L25/061 , H04L25/067 , H04L27/2078 , H04L27/2647
摘要： Methods and apparatuses for reducing effects of impulse noise in a DSL transmitter receiver device are described. According to certain embodiment, the method includes comparing a hard decision output of a decoder with a soft decision output for a convolution coded modulation symbol received at a digital subscriber line (DSL) receiver. The presence of impulse noise is detected based on a lack of agreement between the hard decision output and the soft decision output.
摘要翻译： 描述了用于减少DSL发射机接收机设备中脉冲噪声影响的方法和设备。 根据某些实施例，该方法包括将解码器的硬判决输出与用于在数字用户线（DSL）接收机处接收的卷积编码调制符号的软判决输出进行比较。 基于硬判决输出与软决策输出之间缺乏一致性来检测脉冲噪声的存在。
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公开(公告)号：US5241563A
公开(公告)日：1993-08-31
申请号：US927827
申请日：1992-08-10
申请人： Woo H. Paik , John M. Fox , Scott A. Lery
发明人： Woo H. Paik , John M. Fox , Scott A. Lery
CPC分类号： H03M13/2732 , H03M13/33
摘要： An interleaver processes information in a pseudorandom order to provide pseudorandom interleaved data for communication to a deinterleaver. The pseudorandom interleaved data is processed at the deinterleaver in a pseudorandom order corresponding to that used at the interleaver means, to recover the original information. The pseudorandom processing at the deinterleaver is synchronized with the pseudorandom processing at the interleaver on a trial and error basis. In one embodiment, full synchronization occurs when a Viterbi decoder receiving data from the deinterleaver has a renormalization rate within a designated threshold and when enough synchronization words are detected in data output from the deinterleaver to meet a predetermined criterion. In another embodiment, a timer is used to initiate a new starting address for the pseudorandom processing at the deinterleaver during successive time intervals. Synchronization is achieved when a start address is found that results in the detection of enough synchronization words in data output from the deinterleaver to meet a predetermined synchronization criterion.
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公开(公告)号：US06255967B1
公开(公告)日：2001-07-03
申请号：US09457433
申请日：1999-12-07
IPC分类号： H03M700
CPC分类号： H04L25/4927
摘要： An improved DC compensation method for use in conjunction with telephony signalling. The method includes defining a frame that includes at least two n-bit codewords. An unsigned codeword is then identified within the frame by applying a rule to the codewords in the defined frame. Next, a sign bit is appended to the unsigned codeword, thereby producing a DC compensating codeword. The sign bit is selected based upon a weighting function of the linear values associated with previously transmitted codewords. The remaining unsigned codewords in the frame are assigned sign bits from user data.
摘要翻译： 一种与电话信令结合使用的改进的直流补偿方法。 该方法包括定义包括至少两个n位码字的帧。 然后通过将规则应用于定义的帧中的码字来识别帧内的无符号码字。 接下来，将符号位附加到无符号码字，从而产生DC补偿码字。 基于与先前发送的码字相关联的线性值的加权函数来选择符号位。 帧中剩余的未签名码字从用户数据中分配符号位。
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公开(公告)号：US5995548A
公开(公告)日：1999-11-30
申请号：US888201
申请日：1997-07-07
CPC分类号： H04L1/242 , H04L25/4927 , H04L27/3411 , H04Q11/04
摘要： A combined frame mapping technique that uses aspects of Minimum Modulus Conversion (MMC) and Shell Mapping (SM) to map data bits to a sequence of data symbols, or points. The apparatus includes a shell mapper to generate ring indices from K data bits and a modulus converter to select the signal points from within the ring based on B data bits. The apparatus and method permits the use of constellations having any integer number of points per ring. Variations in the constellations from time-slot to time-slot within a frame are also accommodated. The number of rings in each constellation remains constant, but the moduli vary. MMSM produces d.sub.min equal to the best of MMC and SM, and in some cases d.sub.min, may be better than that for either MMC or SM.
摘要翻译： 使用最小模转换（MMC）和壳映射（SM）的方面的组合帧映射技术来将数据位映射到数据符号或点的序列。 该装置包括一个壳映射器，用于从K个数据位产生环形索引，以及一个模数转换器，用于根据B数据位从环内选择信号点。 该装置和方法允许使用具有每个环的任何整数个点的星座。 也适应了帧内从时隙到时隙的星座的变化。 每个星座中的环数保持不变，但是模数不同。 MMSM产生等于MMC和SM最佳的dmin，在某些情况下，dmin可能比MMC或SM更好。
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7.发明授权Method and device for generating signal constellations in PCM space for high speed data communications 失效用于在PCM空间中产生用于高速数据通信的信号星座的方法和装置
公开(公告)号：US6009121A
公开(公告)日：1999-12-28
申请号：US957698
申请日：1997-10-24
申请人： Mark A. Waldron , Scott A. Lery
发明人： Mark A. Waldron , Scott A. Lery
CPC分类号： H04L25/4927
摘要： A method and device for generating a constellation of Pulse Code Modulation (PCM) levels to represent digital data in a communication system. The constellation of Pulse Code Modulation levels are selected to have a total number of PCM levels and an upper power limit that optimizes noise performance. PCM levels are selected to increase the minimum spacing between PCM levels as great as possible while staying within the upper power limit for a constellation having a desired number of PCM levels. To minimize the power level of the selected constellation, constellation points are selected starting from PCM levels at linear values near zero to PCM levels at higher linear values. To improve noise performance, the number of occurrences of the minimum distance between PCM levels is also reduced without exceeding the upper power level. To reduce occurrences of the minimum distance between constellation points, PCM levels at the minimum distance from the previously selected PCM level may be skipped. The number of PCM levels spaced at the minimum distance is thus reduced to an optimum number without exceeding the upper power level.
摘要翻译： 一种用于在通信系统中生成用于表示数字数据的脉冲编码调制（PCM）级别的星座的方法和装置。 脉冲编码调制级别的星座被选择为具有PCM级别的总数和上限功率限制，可以优化噪声性能。 选择PCM电平以尽可能大地增加PCM电平之间的最小间隔，同时对于具有期望数量的PCM电平的星座保持在上限功率限制内。 为了最小化所选星座的功率电平，从线性值接近零的PCM电平开始，以较高线性值从PCM电平开始选择星座点。 为了提高噪声性能，PCM电平之间的最小距离的出现次数也降低，而不超过上功率电平。 为了减少星座点之间的最小距离的出现，可能会跳过距离先前选择的PCM级别最小距离的PCM级别。 因此，以最小距离间隔的PCM级数减少到最佳数量而不超过上功率级。
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公开(公告)号：US5999109A
公开(公告)日：1999-12-07
申请号：US871220
申请日：1997-06-09
CPC分类号： H04L25/4927
摘要： An improved DC compensation method for use in conjunction with telephony signalling. The method includes defining a frame that includes at least two n-bit codewords. An unsigned codeword is then identified within the frame by applying a rule to the codewords in the defined frame. Next, a sign bit is appended to the unsigned codeword, thereby producing a DC compensating codeword. The sign bit is selected based upon a weighting function of the linear values associated with previously transmitted codewords. The remaining unsigned codewords in the frame are assigned sign bits from user data.
摘要翻译： 一种与电话信令结合使用的改进的直流补偿方法。 该方法包括定义包括至少两个n位码字的帧。 然后通过将规则应用于定义的帧中的码字来识别帧内的无符号码字。 接下来，将符号位附加到无符号码字，从而产生DC补偿码字。 基于与先前发送的码字相关联的线性值的加权函数来选择符号位。 帧中剩余的未签名码字从用户数据中分配符号位。
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公开(公告)号：US07068649B2
公开(公告)日：2006-06-27
申请号：US09922385
申请日：2001-08-03
申请人： Kevin Fisher , Scott A. Lery , Andrew L. Norrell
发明人： Kevin Fisher , Scott A. Lery , Andrew L. Norrell
IPC分类号： H04L12/66
CPC分类号： H04L12/2838 , H04L12/2803 , H04L2012/2845 , H04M11/062
摘要： An extended bandwidth HomePNA system uses a transmit spectrum having a greater bandwidth than the bandwidth specified by a HomePNA 2.0 communication standard. The extended bandwidth system of the invention provides for additional copies of a spectrum of a 2 Mbaud training signal for better accuracy in decoding transmitted data by a receiver. In one embodiment, the extended bandwidth is a 12 MHz band centered at 10 MHz, from 4 MHz to 16 MHz. This extended bandwidth allows for three copies of a 4 Mbaud training sequence or six copies of a 2 Mbaud training sequence. The extended bandwidth of the invention is compatible with a HomePNA 2.0 system by providing a training sequence that enables a HomePNA 2.0 receiver in 2 Mbaud mode to train on the transmitted signal and determine that the transmitted signal is not intended for the HomePNA 2.0 receiver in 2 Mbaud mode.
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公开(公告)号：US5363408A
公开(公告)日：1994-11-08
申请号：US852330
申请日：1992-03-24
申请人： Woo H. Paik , Scott A. Lery , John M. Fox
发明人： Woo H. Paik , Scott A. Lery , John M. Fox
CPC分类号： H04L1/0059 , H04L1/0071 , H04L27/0012 , H04N5/211
摘要： A quadrature amplitude modulation (QAM) communication system is provided in which data can be communicated in any one of a plurality of QAM modes, such as 16-QAM, 32-QAM, and 64-QAM. A receiver detects the particular QAM mode transmitted on a trial and error basis, by attempting to decode the received data using different QAM modes until a synchronization condition is detected. The synchronization condition can require that a plurality of different synchronization tests be met. In a specific embodiment, a first synchronization test is met when a renormalization rate of a trellis decoder is below a threshold value. A second synchronization test is met when a first synchronization word is detected in the received data. A third and final synchronization test is met when a second synchronization word is detected in the received data. In order to reduce the cost of the receiver, most of the QAM mode dependent components are implemented using look-up tables stored in PROMs.
摘要翻译： 提供了一种正交幅度调制（QAM）通信系统，其中可以以诸如16-QAM，32-QAM和64-QAM的多个QAM模式中的任何一个来传送数据。 接收机通过尝试使用不同的QAM模式对接收到的数据进行解码，直到检测到同步状态，来检测基于试错法发送的特定QAM模式。 同步条件可以要求满足多个不同的同步测试。 在具体实施例中，当网格解码器的重正化率低于阈值时，满足第一同步测试。 当在接收的数据中检测到第一同步字时，满足第二同步测试。 当在接收的数据中检测到第二同步字时，满足第三次和最后一次同步测试。 为了降低接收机的成本，使用存储在PROM中的查找表来实现大多数QAM模式相关组件。
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