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1. 发明授权

US07088793B1 Equalizer for complex modulations in very noisy environments 有权
标题翻译：在非常嘈杂的环境中进行复杂调制的均衡器
公开(公告)号：US07088793B1
公开(公告)日：2006-08-08
申请号：US10124798
申请日：2002-04-17
申请人： Rodney L. Mickelson , Thomas L. Tapp , Steven L. White
发明人： Rodney L. Mickelson , Thomas L. Tapp , Steven L. White
IPC分类号： H03D1/00 , H04L27/06
CPC分类号： H04L25/03171 , H04L1/005 , H04L1/0066
摘要： An equalizer is used with complex modulation modems to reduce intersymbol interference. The equalizer includes an equalizer filter that receives an input data signal and adapts to compensate for the noisy communications channels to reduce intersymbol interference to the input signal. A branch metric computer demodulates the equalizer filter adapted input data signal. A decision device delivers an alpha value, starting phase information and confidence values from the demodulated input data signal. A gain determination function receives the confidence values and determines adaptation gain for the equalizer filter. A remodulator receives the alpha value and starting phase information and remodulates the alpha value and starting phase information into a remodulated data signal. A summing function compares the remodulated data signal to a delayed version of the input signal to generate an error signal for the equalizer filter to adjust the equalizer filter.
摘要翻译：均衡器与复数调制调制解调器一起使用以减少符号间干扰。均衡器包括均衡器滤波器，其接收输入数据信号并适于补偿有噪声的通信信道以减少对输入信号的符号间干扰。分支度量计算机解调均衡器滤波器适配输入数据信号。判定装置传送α值，从解调输入数据信号开始相位信息和置信度值。增益确定功能接收置信度值并确定均衡器滤波器的自适应增益。重新调制器接收α值和起始相位信息，并重新调制α值并将起始相位信息重新调入数据信号。求和功能将再调制的数据信号与输入信号的延迟版本进行比较，以产生用于均衡器滤波器的误差信号，以调整均衡器滤波器。

2. 发明授权

US06968021B1 Synchronization method and apparatus for modems based on jointly iterative turbo demodulation and decoding 有权
标题翻译：基于联合迭代turbo解调和解码的调制解调器的同步方法和装置
公开(公告)号：US06968021B1
公开(公告)日：2005-11-22
申请号：US09961666
申请日：2001-09-24
申请人： Steven L. White , Joseph C. Whited , Thomas L. Tapp , Rodney L. Mickelson
发明人： Steven L. White , Joseph C. Whited , Thomas L. Tapp , Rodney L. Mickelson
IPC分类号： H03D1/00 , H04L1/00 , H04L7/00 , H04L7/02 , H04L25/03 , H04L27/00
CPC分类号： H04L1/005 , H04L1/0054 , H04L1/0055 , H04L1/0065 , H04L1/0071 , H04L7/0062 , H04L25/03171 , H04L25/03197 , H04L2025/03407 , H04L2027/0048
摘要： A bandwidth efficient advanced modulation waveform modem using concatenated iterative turbo coding and continuous phase modulation is disclosed. A demodulator in the modem has a turbo decoder and a decision feedback carrier and time tracking algorithm to track a carrier and adjust timing. The decision feedback carrier and time tracking algorithm may use an APP decoder as a decision device to provide symbol decisions at a high error rate and low latency for a coded input data stream. A symbol phase estimator produces a symbol phase error estimate from the symbol decisions. An erasure decision function decides which symbol decisions are correct and which symbol decisions are erasures. A carrier tracking function receives the symbol phase error estimates when the symbol decisions are correct and receives erasure inputs when the symbol decisions are erasures to maintain carrier tracking.
摘要翻译：公开了一种使用级联迭代turbo编码和连续相位调制的带宽高效调制波形调制解调器。调制解调器中的解调器具有turbo解码器和用于跟踪载波并调整定时的判定反馈载波和时间跟踪算法。判定反馈载波和时间跟踪算法可以使用APP解码器作为决策设备，以便以高错误率和低延迟为编码的输入数据流提供符号决定。符号相位估计器从符号判定产生符号相位误差估计。擦除决策功能决定哪些符号决定是正确的，哪些符号决定是擦除。当符号判定是正确的时候，载波跟踪功能接收符号相位误差估计，并且当符号决定是擦除以维持载波跟踪时接收擦除输入。

3. 发明授权

US06760374B1 Block decision feedback equalization method and apparatus 有权
标题翻译：块决策反馈均衡方法和装置
公开(公告)号：US06760374B1
公开(公告)日：2004-07-06
申请号：US09665509
申请日：2000-09-19
申请人： Thomas L. Tapp , Joseph T. Graf
发明人： Thomas L. Tapp , Joseph T. Graf
IPC分类号： H04H730
CPC分类号： H04H20/12 , H04L25/0232 , H04L25/03146 , H04L2025/0349 , H04L2025/03605 , H04L2025/03796
摘要： A method and apparatus for receiving data over a dispersive media is disclosed. The received signal is composed of an unknown data segment preceded and followed by known data segments. The communication apparatus generates a replica of the known data segments. Channel characteristics existing at the time of transmission of the known data segments are estimated by comparing the known data segments with the replica. The symbols of the unknown data segment are then determined via application of a QR factorization. Factorization can be accomplished via Householder transformation, Givens rotation or fast Givens rotation. Decisions can be made on the various unknown symbols as they are analyzed and then fed back via back substitution.
摘要翻译：公开了一种用于在分散介质上接收数据的方法和装置。接收的信号由已知数据段之前和之后的未知数据段组成。通信装置生成已知数据段的副本。通过将已知数据段与复制品进行比较来估计在已知数据段的传输时存在的信道特性。然后通过应用QR因式分解确定未知数据段的符号。因果分解可以通过Householder转换，Givens旋转或Givens快速旋转来完成。可以对各种未知符号进行判断，因为它们被分析，然后通过反向替换反馈。

4. 发明授权

US07551697B1 Reduced complexity soft-output noncoherent continuous phase demodulator systems 有权
标题翻译：降低复杂度的软输出非相干连续相位解调器系统
公开(公告)号：US07551697B1
公开(公告)日：2009-06-23
申请号：US10957084
申请日：2004-10-01
申请人： Thomas L. Tapp
发明人： Thomas L. Tapp
IPC分类号： H04L27/06
CPC分类号： H04L27/233 , H04L25/067
摘要： A method and system of demodulating a received transmission is disclosed. The method comprises disassembling a symbol sequence into a before sequence, a current symbol, and an after sequence. The method also comprises calculating correlations for all possible before sequences and determining the largest correlations for the before sequences, and placing into a first group. Further, the method comprises calculating correlations for all possible after sequences and determining the largest correlations for the after sequences, and placing into a second group. Further still, the method comprises piecing together the sequences of the first group, the second group, and the current symbol, to form a third group. Yet further still, the method comprises calculating the correlations for the third group and determining the largest correlation of the third group.
摘要翻译：公开了一种解调接收的传输的方法和系统。该方法包括将符号序列拆分成前序列，当前符号和后序序列。该方法还包括计算所有可能的先前序列之间的相关性并且确定先前序列的最大相关性并将其放入第一组中。此外，该方法包括计算所有可能的后序列的相关性，并确定后序序列的最大相关性，并将其置入第二组。此外，该方法还包括将第一组，第二组和当前符号的序列拼接在一起以形成第三组。还有，该方法包括计算第三组的相关性并确定第三组的最大相关性。

5. 发明授权

US06763064B1 Block decision directed equalization method and apparatus 有权
标题翻译：块决策均衡方法和装置
公开(公告)号：US06763064B1
公开(公告)日：2004-07-13
申请号：US09666245
申请日：2000-09-21
申请人： Joseph T. Graf , Thomas L. Tapp
发明人： Joseph T. Graf , Thomas L. Tapp
IPC分类号： H03H730
CPC分类号： H04L25/0236 , H04L2025/03401 , H04L2025/0342
摘要： A method and apparatus for receiving data over a dispersive media is disclosed. The received signal is composed of an unknown data segment preceded and followed by known data segments. A replica of each known data segment is generated by the communication apparatus. Channel characteristics existing at the time of transmission of the known data segments are estimated by comparing the known data segments with the replica. Using estimations of the channel characteristics, symbols of the unknown data segment can be determined. Decisions can be made on the various unknown symbols as they are analyzed. Channel characteristics can be re-estimated after determining each symbol, each pair of symbols or each group of symbols. Two solutions of the unknown symbols can be combined in various ways to arrive at a final determination of the unknown transmitted symbols.
摘要翻译：公开了一种用于在分散介质上接收数据的方法和装置。接收的信号由已知数据段之前和之后的未知数据段组成。每个已知数据段的副本由通信装置生成。通过将已知数据段与复制品进行比较来估计在已知数据段的传输时存在的信道特性。使用信道特性的估计，可以确定未知数据段的符号。在分析各种未知符号时可以做出决定。在确定每个符号，每对符号或每组符号后，可以重新估计通道特性。未知符号的两个解可以以各种方式组合以得到未知传输符号的最终确定。

6. 发明授权

US07573962B1 Diversity code combining scheme for turbo coded systems 有权
标题翻译：用于涡轮编码系统的分集码组合方案
公开(公告)号：US07573962B1
公开(公告)日：2009-08-11
申请号：US11782529
申请日：2007-07-24
申请人： Thomas L. Tapp , Richard A. Groshong
发明人： Thomas L. Tapp , Richard A. Groshong
IPC分类号： H04L1/02 , H04B7/08
CPC分类号： H03M13/258 , H03M13/256 , H03M13/27 , H04L1/005 , H04L1/0065 , H04L1/0071 , H04L1/08
摘要： A diversity code transmission system and method are disclosed. The method including demodulating a first transmission signal using a first continuous phase demodulator resulting in a first output and passing the first output to a first de-interleaver resulting in a second output. The method further including demodulating a second transmission signal using a second continuous phase demodulator resulting in a third output and summing the second output and the third output resulting in a fourth output. The method also includes passing the fourth output to a second de-interleaver resulting in a fifth output and decoding the fifth output to provide a symbol output. The method also includes passing a decoded fifth output to a first interleaver and providing a first interleaver output to the second continuous phase demodulator. Last the method is repeated in an iterative process.
摘要翻译：公开了一种分集码传输系统和方法。该方法包括使用第一连续相位解调器来解调第一传输信号，导致第一输出并将第一输出传递给第一解交织器，导致第二输出。该方法还包括使用第二连续相位解调器来解调第二传输信号，产生第三输出并对第二输出和第三输出进行求和，得到第四输出。该方法还包括将第四输出传递给第二解交织器，得到第五输出并解码第五输出以提供符号输出。该方法还包括将解码的第五输出传递给第一交织器，并向第二连续相位解调器提供第一交织器输出。最后，迭代过程重复该方法。

7. 发明授权

US07281174B1 Diversity code combining scheme for turbo coded systems 有权
标题翻译：用于涡轮编码系统的分集码组合方案
公开(公告)号：US07281174B1
公开(公告)日：2007-10-09
申请号：US10957086
申请日：2004-10-01
申请人： Thomas L. Tapp , Richard A. Groshong
发明人： Thomas L. Tapp , Richard A. Groshong
IPC分类号： G06F11/00
CPC分类号： H03M13/258 , H03M13/256 , H03M13/27 , H04L1/005 , H04L1/0065 , H04L1/0071 , H04L1/08
摘要： A diversity code transmission system is disclosed. The diversity code transmission system comprises an encoder encoding a set of bits. The system also comprises an interleaver receiving the encoded bits and providing an output. A coder or modulator for providing a first transmission signal is also used. The interleaver iteratively receives its own output to provide an iterated output to a coder or modulator to provide a diversity transmission signal. The receiving system supports iterative decoding and joint iterative demodulation and decoding.
摘要翻译：公开了一种分集码传输系统。分集码传输系统包括编码一组位的编码器。该系统还包括接收编码比特并提供输出的交织器。还使用用于提供第一传输信号的编码器或调制器。交织器迭代地接收其自己的输出以向编码器或调制器提供迭代输出以提供分集传输信号。接收系统支持迭代解码和联合迭代解调和解码。

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