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公开(公告)号：US20100111141A1
公开(公告)日：2010-05-06
申请号：US12651945
申请日：2010-01-04
IPC分类号： H04B1/707
CPC分类号： H04B7/216 , H04B1/71 , H04B1/7107 , H04J13/0003 , H04J13/16 , H04L25/03038 , H04L25/03343 , H04L25/49 , H04L27/3405 , H04L2025/03375 , H04L2025/03477
摘要： A communication system performs burst noise cancellation. A transmitter produces and transmits a spread signal that comprises at least one known-value symbol spread by a plurality of non data-carrying orthogonal codes and data symbols spread by at least one data-carrying orthogonal code. The transmitter transmits the spread signal across a communication link that introduces burst noise. A burst noise detector determines burst noise affected chips of the orthogonal codes. A weight computation functional block calculates a plurality of complex-valued combining weights based upon the burst noise affected chips. A vector de-spreader and a linear combiner operate in combination to use the plurality of non data-carrying orthogonal codes, the at least one data-carrying orthogonal code, and the plurality of complex-valued combining weights to de-spread the received spread signal to produce the data symbols with the burst noise substantially removed.
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公开(公告)号：US07616701B2
公开(公告)日：2009-11-10
申请号：US10779825
申请日：2004-02-17
申请人： Gottfried Ungerboeck
发明人： Gottfried Ungerboeck
IPC分类号： H04L27/00
CPC分类号： H04L25/4975 , H04L25/03343 , H04L25/497
摘要： ZEB (zero excess bandwidth) modulation. The modulation rate of a signal is increased to the entirety of a communication channel's available bandwidth. Spectral zeroes at the edges of the available bandwidth now coincide with spectral zeroes at the edges of the Nyquist band and lead to ISI (intersymbol interference), which cannot be eliminated by equalization. Thus, in a ZEB system intersymbol interference (ISI) is intentionally allowed and dealt with by the known technique of TH (Tomlinson-Harashima) precoding. Comparison of conventional zero-ISI systems with ZEB systems, both exhibiting identical transmit spectra with finite spectral roll offs towards the edges of the available bandwidth, illustrate significant gains in channel throughput achievable by the ZEB systems. Similar gains can hardly be achieved by more sophisticated channel coding for zero-ISI systems. For ZEB systems an effective spectral shaping involving a simple infinite impulse response (IIR) of the overall channel is proposed.
摘要翻译： ZEB（零超宽带）调制。 信号的调制率增加到通信信道的可用带宽的整体。 现在可用带宽边缘处的光谱零点现在与奈奎斯特带边缘处的频谱零点相符，并导致ISI（符号间干扰），这不能通过均衡消除。 因此，在ZEB系统中，符号间干扰（ISI）有意地被TH（Tomlinson-Harashima）预编码的已知技术所允许和处理。 传统的零ISI系统与ZEB系统的比较，既表现出相对于可用带宽边缘的有限频谱滚转的相同发射频谱，也表明了ZEB系统可实现的信道吞吐量的显着增益。 通过针对零ISI系统的更复杂的信道编码难以实现类似的收益。 对于ZEB系统，提出了涉及整个信道的简单无限脉冲响应（IIR）的有效频谱整形。
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公开(公告)号：US20090215403A1
公开(公告)日：2009-08-27
申请号：US12434668
申请日：2009-05-03
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.
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公开(公告)号：US07457351B1
公开(公告)日：2008-11-25
申请号：US11522839
申请日：2006-09-18
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.
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45.发明授权Optimal trellis code design for QPSK and higher order quadrature amplitude modulations 失效用于QPSK和更高阶正交幅度调制的最优格码设计公开(公告)号：US07379504B2
公开(公告)日：2008-05-27
申请号：US10263215
申请日：2002-10-02
IPC分类号： H04L5/12
CPC分类号： H04L1/006 , H04L1/0003 , H04L27/3427
摘要： A wireless device and system employs a two-dimensional (2-D) Trellis code that can be applied to Quadrature Phase Shift Keying (QPSK) and higher order Quadrature Amplitude Modulation (QAM) constellations. The Trellis codes employed have optimal Euclidean distance properties for QPSK constellations, and have very good Euclidean distance properties for higher-order QAM constellations. The Trellis codes are suited for transmission systems that adopt multi-mode QPSK and QAM constellations with different data rates since the same Trellis code can be applied to all modulation formats and the same decoder can be used at the receiver for all modulation formats. Modulation formats include QPSK, 8-QAM, 16-QAM, 32-QAM, and 64-QAM and may be extended to even higher order modulations formats.
摘要翻译： 无线设备和系统采用可应用于正交相移键控（QPSK）和更高阶正交幅度调制（QAM）星座的二维（2-D）网格码。 所采用的网格码对于QPSK星座具有最佳的欧几里德距离特性，对于高阶QAM星座具有非常好的欧几里德距离特性。 网格码适合于采用具有不同数据速率的多模式QPSK和QAM星座的传输系统，因为相同的网格码可以应用于所有调制格式，并且相同的解码器可以在接收机处用于所有调制格式。 调制格式包括QPSK，8-QAM，16-QAM，32-QAM和64-QAM，并且可以扩展到甚至更高阶的调制格式。
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公开(公告)号：US20060093146A1
公开(公告)日：2006-05-04
申请号：US11255698
申请日：2005-10-21
IPC分类号： H04L9/00
CPC分类号： H04L25/03866
摘要： A two-stage block synchronization and scrambling module includes a synchronization PRNG module, a scramble PRNG module, a summing module, and a storage module. The synchronization PRNG module is clocked once per N+1 bit PCS frame (N arbitrary) to produce a synchronization bit and a pseudo-random starting state for the scramble PRNG. The scramble PRNG module is clocked N times per PCS frame to produce a cipher stream starting with a pseudo-random state from the synchronization PRNG. The summing module is operably coupled to sum the cipher stream and a PCS frame payload to produce scrambled payload. The storage module is operably coupled to store the scrambled payload with the synchronization bit. Synchronization bits from successive frames are a running bit-serial representation of the synchronization PRNG state and are used by the receiver to synchronize with the transmit scrambler.
摘要翻译： 两级块同步和加扰模块包括同步PRNG模块，加扰PRNG模块，求和模块和存储模块。 每N + 1位PCS帧（N任意）为同步PRNG模块计时一次，以产生用于加扰PRNG的同步位和伪随机起始状态。 加扰PRNG模块按照PCS帧为N次计时，以产生从同步PRNG开始的伪随机状态的密码流。 求和模块可操作地耦合以对加密流和PCS帧有效载荷求和以产生加扰有效载荷。 存储模块可操作地耦合以存储具有同步位的加扰有效载荷。 来自连续帧的同步位是同步PRNG状态的运行位串行表示，并被接收机用于与发送扰频器同步。
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公开(公告)号：US20060045197A1
公开(公告)日：2006-03-02
申请号：US11211210
申请日：2005-08-25
申请人： Gottfried Ungerboeck , Ba-Zhong Shen , Scott Powell , Kelly Cameron , Hau Tran
发明人： Gottfried Ungerboeck , Ba-Zhong Shen , Scott Powell , Kelly Cameron , Hau Tran
IPC分类号： H04L5/12
CPC分类号： H03M13/255 , H03M13/11 , H04L25/4975 , H04L27/3405 , H04L27/3427
摘要： LDPC (Low Density Parity Check) coded 128 DSQ (Double Square QAM) constellation modulation and its associated labeling. A novel means is introduced by which a constellation may be arranged and mapping in its symbols may be determined to provide for improved performance. One application area in which this may be employed is transmission over twisted pair (typically copper) cabling existent within data centers of various networks. The operation of the IEEE 802.3 Ethernet local area networks currently being used (as well as those currently under development) would benefit greatly by employing the various principles presented herein. When this novel approach of an LDPC coded 128 DSQ constellation modulation combined with TH (Tomlinson-Harashima) preceding is employed within a communication device at a transmitter end of a communication channel (i.e., in a transmitter and/or a transceiver), the overall operation of a communication system may improve significantly when compared to prior techniques.
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48.发明申请公开(公告)号：US20050271139A1
公开(公告)日：2005-12-08
申请号：US11188301
申请日：2005-07-25
CPC分类号： H04L27/3405 , H03M7/40
摘要： In a communication system, Huffman coding techniques are used to obtain shaping gains for an improvement in data transmission rates. More particularly, a novel method of Huffman shaping is described that achieves a shaping gain of greater than 1 dB. The shaping gain results in a higher data rate transmission in a communication system where transmitted power is constrained.
摘要翻译： 在通信系统中，使用霍夫曼编码技术获得整形增益以提高数据传输速率。 更具体地，描述了一种实现霍夫曼整形的新方法，其实现了大于1dB的整形增益。 整形增益导致传输功率受限的通信系统中的较高数据速率传输。
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公开(公告)号：US08275050B2
公开(公告)日：2012-09-25
申请号：US12272556
申请日：2008-11-17
CPC分类号： H04L27/3416 , H03M13/253 , H04L1/0057 , H04L1/0065 , H04L27/36
摘要： A method and apparatus is disclosed to map a sequence of data to Quadrature Amplitude Modulation (QAM) constellation symbols. The method and apparatus encodes only a portion of the sequence of data and leaves a remaining portion of the sequence of data unencoded. The encoded portion of the sequence of data and the remaining unencoded portion of the sequence of data are then mapped into modulation symbols of the QAM constellation. The encoded portion of the sequence of data selects subsets of the QAM constellation, and the remaining unencoded portion of the sequence of data determines a specific modulation symbol within each subset of the QAM constellation.
摘要翻译： 公开了一种将数据序列映射到正交幅度调制（QAM）星座符号的方法和装置。 该方法和装置仅对该数据序列的一部分进行编码，并留下未被编码的数据序列的剩余部分。 然后将数据序列的编码部分和数据序列的剩余未编码部分映射到QAM星座图的调制符号中。 数据序列的编码部分选择QAM星座的子集，并且数据序列的剩余未编码部分确定QAM星座图的每个子集内的特定调制符号。
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公开(公告)号：US08213611B2
公开(公告)日：2012-07-03
申请号：US11255698
申请日：2005-10-21
CPC分类号： H04L25/03866
摘要： A two-stage block synchronization and scrambling module includes a synchronization PRNG module, a scramble PRNG module, a summing module, and a storage module. The synchronization PRNG module is clocked once per N+1 bit PCS frame (N arbitrary) to produce a synchronization bit and a pseudo-random starting state for the scramble PRNG. The scramble PRNG module is clocked N times per PCS frame to produce a cipher stream starting with a pseudo-random state from the synchronization PRNG. The summing module is operably coupled to sum the cipher stream and a PCS frame payload to produce scrambled payload. The storage module is operably coupled to store the scrambled payload with the synchronization bit. Synchronization bits from successive frames are a running bit-serial representation of the synchronization PRNG state and are used by the receiver to synchronize with the transmit scrambler.
摘要翻译： 两级块同步和加扰模块包括同步PRNG模块，加扰PRNG模块，求和模块和存储模块。 每N + 1位PCS帧（N任意）为同步PRNG模块计时一次，以产生用于加扰PRNG的同步位和伪随机起始状态。 加扰PRNG模块按照PCS帧为N次计时，以产生从同步PRNG开始的伪随机状态的密码流。 求和模块可操作地耦合以对加密流和PCS帧有效载荷求和以产生加扰有效载荷。 存储模块可操作地耦合以存储具有同步位的加扰有效载荷。 来自连续帧的同步位是同步PRNG状态的运行位串行表示，并被接收机用于与发送扰频器同步。
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