公开(公告)号：US20070014334A1

公开(公告)日：2007-01-18

申请号：US11522837

申请日：2006-09-18

申请人： Bruce Currivan ,  Thomas Kolze ,  Gottfried Ungerboeck ,  Nabil Yousef

发明人： Bruce Currivan ,  Thomas Kolze ,  Gottfried Ungerboeck ,  Nabil Yousef

IPC分类号： H04B1/707

CPC分类号： H04B7/216 ,  H04B1/71 ,  H04B1/7102 ,  H04B1/7105 ,  H04B1/7107 ,  H04J13/0003 ,  H04J13/16

摘要： Cancellation of interference in a communication system with application to S-CDMA. A relatively straight-forward implemented and computationally efficient approach of selecting a predetermined number of unused codes is used to perform weighted linear combination selectively with each of the input spread signals in a multiple access communication system. If desired, the predetermined number of unused codes is always the same in each implementation. Alternatively, the predetermined number of unused codes is selected from within a reordered code matrix using knowledge that is shared between the two ends of a communication system, such as between the CMs and a CMTS. While the context of an S-CDMA communication system having CMs and a CMTS is used, the solution is generally applicable to any communication system that seeks to cancel narrowband interference. Several embodiments are also described that show the generic applicability of the solution across a wide variety of systems.

摘要翻译： 消除应用于S-CDMA的通信系统中的干扰。 使用选择预定数量的未使用代码的相对直接的实现和计算上有效的方法来在多址通信系统中与每个输入扩展信号选择性地执行加权线性组合。 如果需要，在每个实现中，预定数量的未使用代码总是相同的。 或者，使用在诸如CM和CMTS之间的通信系统的两端之间共享的知识，从重排序代码矩阵中选择预定数量的未使用代码。 虽然使用具有CM和CMTS的S-CDMA通信系统的上下文，但该解决方案通常适用于试图取消窄带干扰的任何通信系统。 还描述了几个实施例，其显示了解决方案在各种系统上的通用适用性。

公开(公告)号：US07110434B2

公开(公告)日：2006-09-19

申请号：US10142189

申请日：2002-05-08

申请人： Bruce J. Currivan ,  Thomas J. Kolze ,  Gottfried Ungerboeck ,  Nabil R. Yousef

发明人： Bruce J. Currivan ,  Thomas J. Kolze ,  Gottfried Ungerboeck ,  Nabil R. Yousef

IPC分类号： H04B1/707

CPC分类号： H04B7/216 ,  H04B1/71 ,  H04B1/7102 ,  H04B1/7105 ,  H04B1/7107 ,  H04J13/0003 ,  H04J13/16

摘要： A relatively straight-forward implemented, and computationally efficient approach of selecting a predetermined number of unused codes is used to perform weighted linear combination selectively with each of the input spread signals in a multiple access communication system. If desired, the predetermined number of unused codes is always the same in each implementation. Alternatively, the predetermined number of unused codes are selected from within a reordered code matrix using knowledge that is shared between the two ends of a communication system, such as between the CMs and a CMTS. While the context of an S-CDMA communication system having CMs and a CMTS is used, the solution is generally applicable to any communication system that seeks to cancel narrowband interference. Several embodiments are also described that show the generic applicability of the solution across a wide variety of systems.

摘要翻译： 使用选择预定数量的未使用代码的相对简单的实现和计算上有效的方法来在多址通信系统中选择性地与每个输入扩展信号执行加权线性组合。 如果需要，在每个实现中，预定数量的未使用代码总是相同的。 或者，使用在诸如CM和CMTS之间的通信系统的两端之间共享的知识，从重排序代码矩阵中选择预定数量的未使用代码。 虽然使用具有CM和CMTS的S-CDMA通信系统的上下文，但该解决方案通常适用于试图取消窄带干扰的任何通信系统。 还描述了几个实施例，其显示了解决方案在各种系统上的通用适用性。

公开(公告)号：US20060041918A9

公开(公告)日：2006-02-23

申请号：US10427593

申请日：2003-05-01

申请人： Bruce Currivan ,  Thomas Kolze ,  Daniel Howard ,  Gottfried Ungerboeck

发明人： Bruce Currivan ,  Thomas Kolze ,  Daniel Howard ,  Gottfried Ungerboeck

IPC分类号： H04N7/16 ,  H04N7/173

CPC分类号： H04L27/3411 ,  H04B1/71 ,  H04B1/7107 ,  H04B7/216 ,  H04L25/03038 ,  H04L25/03343 ,  H04L25/49 ,  H04L27/3405 ,  H04L2025/03375 ,  H04L2025/03477 ,  H04N7/17309 ,  H04N21/42676

摘要： Signal processing under attenuated transmission conditions. Within an orthogonal signal space, the number of orthogonal signals that are used to transmit information from a transmitter to a receiver is reduced and the transmitted power of each of the now remaining orthogonal signals is modified; this may involve increasing the power of all of the remaining orthogonal signals equally or alternatively modifying them individually. The same modulation used before the reduction may also be used afterwards; within communication systems having multiple transmitter-receiver paths, this will ensure that the communication system's throughput and efficiency will remain unchanged even when one (or more) transmitter-receiver paths are highly attenuated. In addition, robust mode operation is provided for ranging and registering of transmitter devices when entering the communication system. In addition, the unused orthogonal signals may be employed to support interference cancellation of those orthogonal signals that are used to transmit information.

公开(公告)号：US20050163242A1

公开(公告)日：2005-07-28

申请号：US10765665

申请日：2004-01-27

申请人： Gottfried Ungerboeck

发明人： Gottfried Ungerboeck

IPC分类号： H04L1/00 ,  H04L5/12 ,  H04L27/34

CPC分类号： H04L27/3488 ,  H04L1/0057 ,  H04L1/0059 ,  H04L1/0071

摘要： The invention is concerned with the mapping of m input bits to 2m modulation symbols of a two-dimensional symbol constellation. A quarter-quadrant constellation of 2m-4 modulation symbols that are located in a first quadrant of the two-dimensional signal plane is formed with each modulation symbol associated with a respective m-4 bit label. A quarter constellation of the two-dimensional symbol constellation is formed by adding to the quarter-quadrant constellation three copies of the quarter-quadrant constellation rotated by −90 degrees, 180 degrees, and −270 degrees, respectively, and then displacing the quarter constellation by a shift value Δ, with each modulation symbol associated with a respective m-2 bit label. The two-dimensional symbol constellation is then formed by adding to the quarter constellation three copies of the quarter constellation rotated by +90 degrees, 180 degrees, and +270 degrees, respectively. Each symbol of the two dimensional constellation is associated with a respective m bit label of the m input bits.

摘要翻译： 本发明涉及将m个输入比特映射到二维符号星座的2个调制符号。 位于二维信号平面的第一象限中的2×4调制符号的四分之一星座形成与各个m-4位标签相关联的每个调制符号。 二维符号星座的四分之一星座是通过将四分之一象限星座的四个象限星座分别旋转-90度，180度和-270度形成的，然后将四分之一星座 每个调制符号与相应的m-2位标签相关联。 然后通过将四分之一星座的三个副本分别加上旋转+90度，180度和+270度的四分之一星座形成二维符号星座。 二维星座的每个符号与m个输入比特的相应的m比特标签相关联。

公开(公告)号：US6061407A

公开(公告)日：2000-05-09

申请号：US947356

申请日：1997-10-08

申请人： Giovanni Cherubini ,  Sedat Oelcer ,  Gottfried Ungerboeck

发明人： Giovanni Cherubini ,  Sedat Oelcer ,  Gottfried Ungerboeck

IPC分类号： H04L27/34 ,  H04L23/02 ,  H04L5/12

CPC分类号： H04L27/3411

摘要： Trellis-enhanced precoding for trellis-coded transmission over channels with intersymbol interference allows coding and shaping gains to be achieved with minimal transmit power penalty for arbitrary signal constellations, provided the intersymbol interference channels are linearly invertible. This technique can be employed for trellis-coded transmission over a variety of communication channels. However, if the channel response exhibits spectral nulls, trellis-enhanced precoding cannot be applied because the corresponding inverse precoding operation at the receiver requires inverse channel filtering. For channels with a spectral null, this inverse operation can result in unlimited error propagation. The present invention allows trellis-coded transmission over channels exhibiting spectral nulls without incurring unlimited error propagation in the receiver. Coding gains are achieved with minimal transmit power penalty, like in the case of trellis-enhanced preceding. The invention is applicable for most signal sets used in practice.

摘要翻译： 网格增强预编码用于具有符号间干扰的信道的网格编码传输允许以任意信号星座的最小发射功率损失来实现编码和整形增益，只要符号间干扰信道是线性可逆的。 这种技术可用于各种通信信道上的网格编码传输。 然而，如果信道响应呈现频谱零点，则不能应用网格增强预编码，因为接收机处的对应的反向预编码操作需要反向信道滤波。 对于具有频谱零点的频道，该反向运算可能导致无限的误差传播。 本发明允许在显示频谱零点的信道上进行网格编码的传输，而不会在接收机中产生无限的误差传播。 编码增益以最小的传输功率损失来实现，就像在网格增强的情况下一样。 本发明适用于实际使用的大多数信号组。

公开(公告)号：US5359709A

公开(公告)日：1994-10-25

申请号：US826504

申请日：1992-01-27

申请人： Alain Blanc ,  Sylvie Gohl-Roux ,  Gottfried Ungerboeck

发明人： Alain Blanc ,  Sylvie Gohl-Roux ,  Gottfried Ungerboeck

IPC分类号： H04L5/00 ,  H04L27/00 ,  H04L29/06 ,  H04L29/10 ,  G06F13/42

CPC分类号： H04L29/06 ,  H04L27/00

摘要： Multiple operating configurations in data circuit terminating equipment (DCE) are enabled through multiple queues stored in a random access memory and which are loaded with bits and characters coming either from data terminating equipment (DTE) or the telecommunications line. The DSP processor stores bits provided by a transmit circuit in a first queue, determines characters from the bits stored in the first queue based on a first transmission protocol and stores the characters in a second queue. A third queue is used by a control processor to store characters to be transmitted to a remote DCE. The DSP processor determines bits to be transmitted from the characters stored in a third queue based on a second transmission protocol, and stores those bits in a fourth queue. When the DCE is operating in a synchronous mode, the DSP processor determines PCM words for transmission based on the contents of the second queue and stores them in a fifth queue for transmission. Similarly, when the DCE switches to an asynchronous mode, the DSP processor determines PCM words based on the contents of the fourth queue and stores them in the fifth queue for transmission. A similar queue arrangement is provided for the receive circuitry of the DCE.

摘要翻译： 数据电路终端设备（DCE）中的多种操作配置通过存储在随机存取存储器中的多个队列启用，并且装载有来自数据终端设备（DTE）或电信线路的位和字符。 DSP处理器将由发送电路提供的位在第一队列中存储，基于第一传输协议从存储在第一队列中的比特确定字符，并将该字符存储在第二队列中。 控制处理器使用第三个队列来存储要发送到远程DCE的字符。 DSP处理器基于第二传输协议确定从存储在第三队列中的字符发送的比特，并将这些比特存储在第四队列中。 当DCE工作在同步模式时，DSP处理器根据第二个队列的内容来确定用于传输的PCM字，并将其存储在第五个队列中进行传输。 类似地，当DCE切换到异步模式时，DSP处理器基于第四队列的内容来确定PCM字，并将它们存储在第五队列中以进行传输。 为DCE的接收电路提供了类似的队列布置。

公开(公告)号：US4969163A

公开(公告)日：1990-11-06

申请号：US401896

申请日：1989-09-01

申请人： Gottfried Ungerboeck

发明人： Gottfried Ungerboeck

IPC分类号： H04L27/22 ,  H04L7/00 ,  H04L7/027 ,  H04L7/033 ,  H04L7/10

CPC分类号： H04L7/0334 ,  H04L7/0278 ,  H04L7/10

摘要： For a modem receiver using an adaptive equalizer with fractional tap spacing, method and apparatus are disclosed for controlling the sample-timing phase. By evaluating bandedge components of the received signal in a particular way, a timing-phase vector signal is derived which is independent of the signal energy at the bandedges and of the quality of frequency separation of the filters for the bandedge signals. After an initial period, the current timing-phase vector signal is captured and stored as a reference. Thereafter, the sampling phase of the receiver is kept at its initial random value, represented by the stored reference timing-phase vector. The necessity to initially change the sampling phase in the receiver to a value which is forced by the received signal is avoided.

公开(公告)号：US4890299A

公开(公告)日：1989-12-26

申请号：US237601

申请日：1988-08-25

申请人： Francois B. Dolivo ,  Gottfried Ungerboeck

发明人： Francois B. Dolivo ,  Gottfried Ungerboeck

IPC分类号： H04L25/40 ,  G11B20/10 ,  G11B20/14 ,  H04L7/02 ,  H04L7/04 ,  H04L7/10 ,  H04L25/34 ,  H04L25/49 ,  H04L25/497

CPC分类号： H04L7/0062 ,  G11B20/10055 ,  G11B20/1403 ,  H04L25/4919 ,  H04L25/497 ,  H04L7/10 ,  H04L7/046

摘要： An apparatus and a method for fast acquisition of the sample-timing phase in systems using partial-response signalling are disclosed. For fast initial adjustment of the timing phase, a known preamble is transmitted. During that phase, previous schemes could occasionally hang up for an extended period of time at the unstable equilibrium point halfway between the desired sampling times. The new procedure eliminates the hangup problem by introducing a hysteresis effect which greatly diminishes the probability of reversals in the once chosen direction of timing-phase adjustment. Thus, reliable adjustment of the timing phase with a much shorter preamble is achieved. The apparatus for furnishing a timing correction signal .DELTA..tau..sub.n includes a timing gradient generator portion (41) and a data sample reconstruction portion (43). The data sample reconstruction portion (43) develops a present reconstructed data sample x.sub.n from the present received signal sample y.sub.n and a previous reconstructed data sample. The output x.sub.n of the data sample reconstruction portion is delayed and furnished to the gradient generation portion (41) which also receives the present received signal sample y.sub.n and a delayed received signal sample, for generating the timing correction signal .DELTA..tau..sub.n.

公开(公告)号：US4644564A

公开(公告)日：1987-02-17

申请号：US787277

申请日：1985-10-15

申请人： Francois B. Dolivo ,  Gottfried Ungerboeck ,  Thomas D. Howell

发明人： Francois B. Dolivo ,  Gottfried Ungerboeck ,  Thomas D. Howell

IPC分类号： H04L25/03 ,  H04L25/497 ,  H04L3/00

CPC分类号： H04L25/03184 ,  H04L25/497 ,  H04L2025/03369 ,  H04L25/03203

摘要： A maximum-likelihood sequence decoder is used with a partial-response signaling system for processing sequences of sampled values from a communication channel or recording device. The partial-response signals can be duobinary, dicode, or partial-response class-IV. The maximum-likelihood decoding for each sequence can be based upon a two-state trellis. Instead of two survivor metrics for two states, only a difference metric is necessary.

摘要翻译： 最大似然序列解码器与部分响应信号系统一起使用，用于处理来自通信信道或记录装置的采样值的序列。 部分响应信号可以是二进制，双向或部分响应类IV。 每个序列的最大似然解码可以基于两状态网格。 代替两个状态的两个幸存者指标，仅需要一个差异度量。

公开(公告)号：US4077021A

公开(公告)日：1978-02-28

申请号：US799405

申请日：1977-05-23

申请人： Istvan Peter Csajka ,  Gottfried Ungerboeck

发明人： Istvan Peter Csajka ,  Gottfried Ungerboeck

IPC分类号： H04L27/38 ,  H04L27/00 ,  H04L27/18 ,  H04L27/20 ,  H04L27/12

CPC分类号： H04L27/186

摘要： A method and structure for converting a sequence of binary digits into a sequence of discrete signal values, e.g., phase values, of a modulated carrier signal for data transmission. By introducing additional redundant signal values and coding information in a state-dependent sequential manner, enlarged minimum Euclidian distance between possible signal value sequences is achieved which results in a reduced error probability when maximum-likelihood decoding is applied in the receiver.

摘要翻译： 一种用于将二进制数字序列转换成用于数据传输的调制载波信号的离散信号值序列（例如相位值）的方法和结构。 通过以状态依赖的顺序方式引入额外的冗余信号值和编码信息，实现了可能的信号值序列之间的放大的最小欧几里德距离，这导致当在接收机中应用最大似然解码时，误差概率降低。