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公开(公告)号：US08223897B2
公开(公告)日：2012-07-17
申请号：US12656476
申请日：2010-02-01
IPC分类号： H04L27/06
摘要： Compact pulse shape partial response (CPS PR) signaling is developed for trellis based signals like QM-MSK, and for PAM/QAM type signals to improve the performance to bandwidth tradeoff. Compact pulse shaped signals are partial response signals that employ a very short pulse shaping filter and use Viterbi decoding to optimally detect the CPS signal in presence of its inherent inter-symbol interference. The CPS filters considered herein have much shorter impulse response than the well-known raised cosine (RC) filter. There is no need to equalize the received signal to eliminate ISI or to allow a fixed amount of ISI between received signal samples as sampled at the symbol rate as is common in partial response maximum likelihood (PRML) systems. Numerical results indicate that CPS QM-MSK and CPS QAM provides between several dB of gain, depending on constellation size, over PR-CPM and RC QAM, when compared at a given value of bandwidth, i.e., B99Tb.
摘要翻译： 紧凑的脉冲形状部分响应（CPS PR）信令是针对基于网格的信号（如QM-MSK）开发的，并且针对PAM / QAM类型信号，可以提高带宽折衷的性能。 紧凑的脉冲形状信号是采用非常短的脉冲整形滤波器的部分响应信号，并使用维特比解码在存在其固有符号间干扰的情况下最佳地检测CPS信号。 这里考虑的CPS滤波器具有比公知的升余弦（RC）滤波器更短的脉冲响应。 不需要均衡所接收的信号以消除ISI或允许在符号率下采样的接收信号样本之间的固定量的ISI在部分响应最大似然（PRML）系统中是常见的。 数值结果表明，当在给定的带宽值（即B99Tb）下进行比较时，CPS QM-MSK和CPS QAM提供了几dB dB的增益，取决于星座大小，而不是PR-CPM和RC QAM。
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公开(公告)号：US20110188603A1
公开(公告)日：2011-08-04
申请号：US12656474
申请日：2010-02-01
IPC分类号： H04L27/36
CPC分类号： H04L27/36
摘要： Compact pulse shape partial response (CPS PR) signaling is developed for trellis based signals like QM-MSK, and for PAM/QAM type signals to improve the performance to bandwidth tradeoff. Compact pulse shaped signals are partial response signals that employ a very short pulse shaping filter and use Viterbi decoding to optimally detect the CPS signal in presence of its inherent inter-symbol interference. The CPS filters considered herein have much shorter impulse response than the well-known raised cosine (RC) filter. There is no need to equalize the received signal to eliminate ISI or to allow a fixed amount of ISI between received signal samples as sampled at the symbol rate as is common in partial response maximum likelihood (PRML) systems. Numerical results indicate that CPS QM-MSK and CPS QAM provides between several dB of gain, depending on constellation size, over PR-CPM and RC QAM, when compared at a given value of bandwidth, i.e., B99Tb.
摘要翻译： 紧凑的脉冲形状部分响应（CPS PR）信令是针对基于网格的信号（如QM-MSK）开发的，并且针对PAM / QAM类型信号，可以提高带宽折衷的性能。 紧凑的脉冲形状信号是采用非常短的脉冲整形滤波器的部分响应信号，并使用维特比解码在存在其固有符号间干扰的情况下最佳地检测CPS信号。 这里考虑的CPS滤波器具有比公知的升余弦（RC）滤波器更短的脉冲响应。 不需要均衡所接收的信号以消除ISI或允许在符号率下采样的接收信号样本之间的固定量的ISI在部分响应最大似然（PRML）系统中是常见的。 数值结果表明，当在给定的带宽值（即B99Tb）下进行比较时，CPS QM-MSK和CPS QAM提供了几dB dB的增益，取决于星座大小，而不是PR-CPM和RC QAM。
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公开(公告)号：US07920637B2
公开(公告)日：2011-04-05
申请号：US12385468
申请日：2009-04-09
IPC分类号： H04L23/02
CPC分类号： H04L1/0054
摘要： A class of bandwidth reduction techniques are used develop a broad class of modulation types collectively called SSB-FM. These signals can be used to construct communication systems that provide bandwidth-normalized performance gains of 10 dB or more when compared to popular prior art modulation methods. An aspect of the invention involves mapping trellis paths in a complex signal space onto corresponding real-valued trellis signals with desirable spectral properties. The invention can be used map continuous phase modulated (CPM) signals onto simpler amplitude-modulated trellis signals having double the channel capacity of prior art CPM signals. Multi-amplitude signaling and frequency division multiplexing may also be incorporated to further accommodate more information per symbol.
摘要翻译： 使用一类带宽简化技术来开发统称为SSB-FM的广泛类型的调制类型。 与传统的现有技术调制方法相比，这些信号可用于构建提供10dB或更大带宽标准化性能增益的通信系统。 本发明的一个方面涉及将复信号空间中的网格路径映射到具有期望的光谱特性的相应的实值格子信号上。 本发明可以将地图连续相位调制（CPM）信号用于具有现有技术CPM信号的两倍的信道容量的更简单的幅度调制网格信号。 还可以并入多幅度信令和频分复用以进一步容纳每个符号的更多信息。
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公开(公告)号：US20110044398A1
公开(公告)日：2011-02-24
申请号：US12461748
申请日：2009-08-24
CPC分类号： H04L27/3433 , H04L1/0051 , H04L1/0054
摘要： Two decoding algorithms are introduced for the decoding of multi-level coded modulation and other types of coded modulation involving component codes and interleaving operations. An improved hard iterative decoding (IHID) algorithm is presented that improves upon a hard iteration decoding technique by adding a stopping criterion. Also, a list Viterbi hard iteration decoding (LV-IHID) algorithm is presented that employs list decoding in conjunction with the IHID algorithm. Both of these decoding algorithms improve upon conventional multi-stage decoding by reducing the effective error multiplicity that is observed at the lowest coding level. It is demonstrated that the LV-IHID algorithm performs close to soft iterative decoding. The computational and delay complexity of the proposed decoding algorithms compare favorably with soft iterative decoding strategies. Also, a novel labeling strategy for MLC design is presented.
摘要翻译： 引入了两种解码算法，用于解码多级编码调制和涉及组件代码和交织操作的其他类型的编码调制。 提出了一种改进的硬迭代解码（IHID）算法，通过添加停止标准来改进硬迭代解码技术。 此外，提出了使用与IHID算法结合的列表解码的维特比硬迭代解码（LV-IHID）算法。 这两种解码算法通过减少在最低编码级别观察到的有效误差多重性来改进传统的多级解码。 证明LV-IHID算法执行接近软迭代解码。 所提出的解码算法的计算和延迟复杂度与软迭代解码策略相比较。 此外，还提出了一种用于MLC设计的新颖的标签策略。
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25.发明授权公开(公告)号：US07609614B2
公开(公告)日：2009-10-27
申请号：US11374217
申请日：2006-03-14
IPC分类号： H04B3/46
CPC分类号： H04L1/0054
摘要： The present invention centers upon uplink communication protocols for use primarily with orthogonal frequency division multiple access (OFDMA) communication systems. Aspects of the invention relate to narrow band frequency division multiplexed (NBFDM) modulation protocols primarily for uplink usage in asymmetric OFDMA communication systems. In particular, NBFDM uplinks that use quadrature multiplexed continuous phase modulation are detailed and noncoherent detection schemes are developed to process the uplink channel signals without the need to transmit uplink phase reference signals. Other aspects of the invention relate to burst mode uplink communications in OFDMA systems such as those involving opportunistic beamforming.
摘要翻译： 本发明主要针对主要用于正交频分多址（OFDMA）通信系统的上行链路通信协议。 本发明的方面涉及主要用于非对称OFDMA通信系统中的上行链路使用的窄带频分复用（NBFDM）调制协议。 特别地，使用正交多路复用连续相位调制的NBFDM上行链路是详细的，并且开发非相干检测方案来处理上行链路信道信号，而不需要发送上行链路相位参考信号。 本发明的其他方面涉及OFDMA系统中的突发模式上行链路通信，例如涉及机会性波束形成的突发模式上行链路通信。
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公开(公告)号：US09362955B2
公开(公告)日：2016-06-07
申请号：US13987516
申请日：2013-08-02
IPC分类号： H04L27/00 , H03M13/29 , H03M13/25 , H03M13/27 , H03M13/37 , H03M13/00 , H03M13/09 , H03M13/11 , H03M13/41
CPC分类号： H03M13/2909 , H03M13/098 , H03M13/1102 , H03M13/1154 , H03M13/253 , H03M13/256 , H03M13/271 , H03M13/2742 , H03M13/2771 , H03M13/2906 , H03M13/2918 , H03M13/2927 , H03M13/2933 , H03M13/2945 , H03M13/2948 , H03M13/3746 , H03M13/4115 , H03M13/6331
摘要： Serially-concatenated codes are formed in accordance with the present invention using a constrained interleaver. The constrained interleaver cause the minimum distance of the serial concatenated code to increase above the minimum distance of the inner code alone by adding a constraint that forces some or all of the distance of the outer code onto the serially-concatenated code. This allows the serially-concatenated code to be jointly optimized in terms of both minimum distance and error coefficient to provide significant performance advantages. These performance advantages allow a noise margin target to be achieved using simpler component codes and a much shorter interleaver than was needed when using prior art codes such as Turbo codes. Decoders are also provided. Both encoding and decoding complexity can be lowered, and interleavers can be made much shorter, thereby shortening the block lengths needed in receiver elements such as equalizers and other decision-directed loops. Also, other advantages are provided such as the elimination of a error floor present in prior art serially-concatenated codes. That allows the present invention to achieve much higher performance at lower error rates such as are needed in optical communication systems.
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公开(公告)号：US09240808B2
公开(公告)日：2016-01-19
申请号：US13987518
申请日：2013-08-02
IPC分类号： H04L27/00 , H03M13/27 , H03M13/25 , H03M13/29 , H03M13/37 , H03M13/15 , H03M13/09 , H03M13/11 , H03M13/41 , H03M13/00
CPC分类号： H03M13/2792 , H03M13/098 , H03M13/1102 , H03M13/1148 , H03M13/1154 , H03M13/1515 , H03M13/152 , H03M13/253 , H03M13/255 , H03M13/256 , H03M13/271 , H03M13/2742 , H03M13/275 , H03M13/2906 , H03M13/2909 , H03M13/2918 , H03M13/2927 , H03M13/2933 , H03M13/2945 , H03M13/2948 , H03M13/3746 , H03M13/4115 , H03M13/6331 , H04L1/0041
摘要： Serially-concatenated codes are formed in accordance with the present invention using a constrained interleaver. The constrained interleaver cause the minimum distance of the serial concatenated code to increase above the minimum distance of the inner code alone by adding a constraint that forces some or all of the distance of the outer code onto the serially-concatenated code. This allows the serially-concatenated code to be jointly optimized in terms of both minimum distance and error coefficient to provide significant performance advantages. Constrained interleaving can be summarized in that it: 1) uses an outer code that is a block code or a non-recursive convolutional code, and as such, there are multiple codewords present in the constrained interleaver, 2) selects a desired MHD, 3) selects an interleaver size and a set of predefined interleaver constraints to prevent undesired (low-distance) error events so as to achieve the desired MHD, and 4) performs uniform interleaving among the allowable (non-constrained) positions, to thereby maximize or otherwise improve the interleaver gain subject to the constraints imposed to maintain the desired MHD.
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公开(公告)号：US20150039966A1
公开(公告)日：2015-02-05
申请号：US13987517
申请日：2013-08-02
IPC分类号： G06F11/10
CPC分类号： G06F11/10 , G06F11/1048 , H03M13/271 , H03M13/2742 , H03M13/29 , H03M13/2906 , H03M13/2933 , H03M13/2939 , H03M13/2972 , H03M13/3746 , H03M13/4115 , H03M13/6362
摘要： Serially-concatenated codes are formed in accordance with the present invention using a constrained interleaver. The constrained interleaver cause the minimum distance of the serial concatenated code to increase above the minimum distance of the inner code alone by adding a constraint that forces some or all of the distance of the outer code onto the serially-concatenated code. This allows the serially-concatenated code to be jointly optimized in terms of both minimum distance and error coefficient to provide significant performance advantages. These performance advantages allow a noise margin target to be achieved using simpler component codes and a much shorter interleaver than was needed when using prior art codes such as Turbo codes. Decoders are also provided. Both encoding and decoding complexity can be lowered, and interleavers can be made much shorter, thereby shortening the block lengths needed in receiver elements such as equalizers and other decision-directed loops. Also, other advantages are provided such as the elimination of a error floor present in prior art serially-concatenated codes. That allows the present invention to achieve much higher performance at lower error rates such as are needed in optical communication systems.
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29.发明申请公开(公告)号：US20150039965A1
公开(公告)日：2015-02-05
申请号：US13987519
申请日：2013-08-02
CPC分类号： H03M13/275 , H03M13/1102 , H03M13/1515 , H03M13/152 , H03M13/19 , H03M13/251 , H03M13/255 , H03M13/271 , H03M13/2742 , H03M13/2933 , H03M13/2939 , H03M13/2957 , H03M13/2972
摘要： Serially-concatenated codes are formed in accordance with the present invention using a constrained interleaver. The constrained interleaver cause the minimum distance of the serial concatenated code to increase above the minimum distance of the inner code alone by adding a constraint that forces some or all of the distance of the outer code onto the serially-concatenated code. This allows the serially-concatenated code to be jointly optimized in terms of both minimum distance and error coefficient to provide significant performance advantages. Constrained interleaving can be summarized in that it: 1) uses an outer code that is a block code or a non-recursive convolutional code, and as such, there are multiple codewords present in the constrained interleaver, 2) selects a desired MHD, 3) selects an interleaver size and a set of predefined interleaver constraints to prevent undesired (low-distance) error events so as to achieve the desired MHD, and 4) performs uniform interleaving among the allowable (non-constrained) positions, to thereby maximize or otherwise improve the interleaver gain subject to the constraints imposed to maintain the desired MHD.
摘要翻译： 根据本发明使用约束交织器形成串联级联代码。 受约束的交织器使得串行级联代码的最小距离通过添加将外部代码的一些或全部距离强制到串行连接的代码上的约束而增加到内部代码的最小距离之上。 这允许串行级联代码根据最小距离和误差系数进行联合优化，以提供显着的性能优势。 约束交织可以总结为：1）使用作为块码或非递归卷积码的外码，因此在约束交织器中存在多个码字，2）选择所需的MHD，3 ）选择交织器大小和一组预定义的交织器约束以防止不期望的（低距离）错误事件以便实现期望的MHD，以及4）在可允许（非约束）位置之间执行均匀交织，从而最大化或 否则改善交织器增益受制于所需的约束以维持所需的MHD。
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公开(公告)号：US20150039964A1
公开(公告)日：2015-02-05
申请号：US13987518
申请日：2013-08-02
CPC分类号： H03M13/2792 , H03M13/098 , H03M13/1102 , H03M13/1148 , H03M13/1154 , H03M13/1515 , H03M13/152 , H03M13/253 , H03M13/255 , H03M13/256 , H03M13/271 , H03M13/2742 , H03M13/275 , H03M13/2906 , H03M13/2909 , H03M13/2918 , H03M13/2927 , H03M13/2933 , H03M13/2945 , H03M13/2948 , H03M13/3746 , H03M13/4115 , H03M13/6331 , H04L1/0041
摘要： Serially-concatenated codes are formed in accordance with the present invention using a constrained interleaver. The constrained interleaver cause the minimum distance of the serial concatenated code to increase above the minimum distance of the inner code alone by adding a constraint that forces some or all of the distance of the outer code onto the serially-concatenated code. This allows the serially-concatenated code to be jointly optimized in terms of both minimum distance and error coefficient to provide significant performance advantages. Constrained interleaving can be summarized in that it: 1) uses an outer code that is a block code or a non-recursive convolutional code, and as such, there are multiple codewords present in the constrained interleaver, 2) selects a desired MHD, 3) selects an interleaver size and a set of predefined interleaver constraints to prevent undesired (low-distance) error events so as to achieve the desired MHD, and 4) performs uniform interleaving among the allowable (non-constrained) positions, to thereby maximize or otherwise improve the interleaver gain subject to the constraints imposed to maintain the desired MHD.
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