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    Receivers for COFDM signals conveying the same data in lower- and upper-frequency sidebands
    2.
    发明申请
    Receivers for COFDM signals conveying the same data in lower- and upper-frequency sidebands 审中-公开

    公开(公告)号：US20190007255A1

    公开(公告)日：2019-01-03

    申请号：US16037747

    申请日：2018-07-17

    申请人： Allen LeRoy Limberg

    发明人： Allen LeRoy Limberg

    IPC分类号： H04L27/26 ,  H04L27/38 ,  H04L1/00

    CPC分类号： H04L27/2698 ,  H04B7/0885 ,  H04L1/005 ,  H04L1/0058 ,  H04L1/0071 ,  H04L27/265 ,  H04L27/38

    摘要： Receivers for coded orthogonal frequency-division multiplexed (COFDM) signals conveying the same coded data both in lower-frequency and upper-frequency sidebands thereof. Apparatus for performing a complex synchrodyne of COFDM signal to baseband is followed by apparatus for extracting the COFDM subcarriers of the lower-frequency and upper-frequency sidebands of the COFDM signal from the in-phase and quadrature-phase results of the complex synchrodyne. The COFDM subcarriers of the lower-frequency sideband as converted to baseband are supplied to apparatus for demodulating and demapping those subcarriers to recover a first set of coded data. The COFDM subcarriers of the upper-frequency sideband as converted to baseband are supplied to apparatus for demodulating and demapping those subcarriers to recover a second set of coded data. A diversity combiner combines the first and second sets of coded data for subsequent decoding.

    Remedying low densities of ONEs in transmission and reception of digital television signals
    6.
    发明申请
    Remedying low densities of ONEs in transmission and reception of digital television signals 审中-公开
    在数字电视信号的传输和接收中，弥补了低密度的ONE

    公开(公告)号：US20140177731A1

    公开(公告)日：2014-06-26

    申请号：US13727268

    申请日：2012-12-26

    申请人： Allen LeRoy Limberg

    发明人： Allen LeRoy Limberg

    IPC分类号： H03M13/29

    CPC分类号： H03M13/618 ,  H03M13/1515 ,  H03M13/152 ,  H03M13/2721 ,  H03M13/2966 ,  H03M13/2972 ,  H03M13/3707

    摘要： In a DTV transmitter the bits of shortened BCH codewords that exhibit undesirably low densities of ONEs are ONEs' complemented before being further coded, and used to modulate carrier waves. In a DTV receiver the further coding is decoded after demodulation. The results of such decoding are processed to recover successive shortened BCH codewords, some of which are in TRUE form and others of which have had their bits ONEs' complemented. Each shortened BCH codeword is extended to full length with ZEROs, and decoding is attempted. Successful decoding confirms that the shortened BCH codeword was received in TRUE form. If decoding is unsuccessful, the bits of the shortened BCH codeword as received are ONEs' complemented, extended to full length with ZEROs, and decoding is attempted. Successful decoding confirms that the shortened BCH codeword was received in ONEs' complemented form and has subsequently been converted to TRUE form.

    摘要翻译： 在DTV发射机中，出现不希望的低密度的1的缩短的BCH码字的比特是在被进一步编码之前被补充，并用于调制载波。 在DTV接收机中，进一步的编码在解调之后解码。 处理这种解码的结果以恢复连续缩短的BCH码字，其中一些是真实的形式，其他的已经具有其'1'的补码。 每个缩短的BCH码字都使用ZERO扩展到全长，并尝试解码。 成功的解码确认缩写的BCH码字以TRUE形式被接收。 如果解码不成功，则所接收的缩短的BCH码字的比特被补充为1，用ZERO扩展到全长，并尝试解码。 成功的解码确认缩短的BCH码字以一个补充的形式被接收，随后被转换为真实的形式。

    Methods and apparatuses for implementing selective interference-filter pre-coding of main-service 8-VSB DTV signals
    7.
    发明授权
    Methods and apparatuses for implementing selective interference-filter pre-coding of main-service 8-VSB DTV signals 失效
    实现主服务8-VSB DTV信号的选择性干扰滤波器预编码的方法和装置

    公开(公告)号：US08699622B2

    公开(公告)日：2014-04-15

    申请号：US12930300

    申请日：2011-01-03

    申请人： Allen LeRoy Limberg

    发明人： Allen LeRoy Limberg

    IPC分类号： H04L27/04

    CPC分类号： H04L1/0071 ,  H04L1/0057 ,  H04L1/0059 ,  H04L1/0065 ,  H04L2001/0093

    摘要： Methods for discontinuing interference-filter pre-coding of 8-VSB digital television (DTV) signals during ancillary-service transmissions are disclosed that do not disrupt reception of main-service DTV signals by receivers already in use. Receivers are disclosed for receiving ancillary-service transmissions without interference-filter pre-coding, which receivers include adaptive channel-equalization filters and subsequent decoders for CCC. The subsequent decoders for CCC respond to data slicing of adaptive channel-equalization filter responses that avoid the reduction of signal-to-noise ratio (SNR) caused by post-comb filtering. Certain of these M/H receivers employ selective post-comb-filtering to flatten the frequency spectrum of main-service components of received 8-VSB DTV signals, while leaving the frequency spectrum of M/H-service components of received 8-VSB DTV signals as received. This is done to generate signal from which filter coefficients for the channel-equalization filters are determined. Certain of these M/H receivers employ decision-feedback equalization (DFE) techniques, which techniques are unaffected by selective interference-filter pre-coding.

    摘要翻译： 公开了在辅助服务传输期间中止8-VSB数字电视（DTV）信号的干扰滤波器预编码的方法，其不会中断已被使用的接收机对主服务DTV信号的接收。 接收机被公开用于接收没有干扰滤波器预编码的辅助业务传输，这些接收机包括用于CCC的自适应信道均衡滤波器和随后的解码器。 用于CCC的后续解码器响应自适应信道均衡滤波器响应的数据分片，其避免由后梳理滤波引起的信噪比（SNR）的降低。 这些M / H接收机中的某些采用选择性后梳状滤波来平坦化接收的8-VSB DTV信号的主服务分量的频谱，同时留下接收到的8-VSB DTV的M / H服务分量的频谱 收到的信号。 这样做可以产生信号，从而确定信道均衡滤波器的滤波器系数。 这些M / H接收机中的某些采用决策反馈均衡（DFE）技术，这些技术不受选择性干扰滤波器预编码的影响。

    8VSB DTV signals with PCCC and subsequent trellis coding
    8.
    发明授权
    8VSB DTV signals with PCCC and subsequent trellis coding 失效
    8VSB DTV信号与PCCC和后续网格编码

    公开(公告)号：US08386896B2

    公开(公告)日：2013-02-26

    申请号：US13068496

    申请日：2011-05-13

    申请人： Allen LeRoy Limberg

    发明人： Allen LeRoy Limberg

    IPC分类号： H03M13/23 ,  H03M13/03 ,  H03M13/00

    CPC分类号： H04L1/0066 ,  H04L1/0041 ,  H04L1/0065 ,  H04L1/0071 ,  H04L1/08 ,  H04L27/02

    摘要： Data to be more robustly transmitted within 8VSB broadcast DTV signals are turbo coded using parallel concatenated convolutional coding (PCCC) and incorporated within the segments of data fields, the bytes of which are convolutionally interleaved before trellis coding and 8VSB symbol mapping. Packing the PCCC into payload fields of MPEG-2-compatible null data packets and Reed-Solomon coding the packets to generate the segments of data fields, the bytes of which are convolutionally interleaved, conditions legacy DTV receivers to disregard PCCC components not useful to them. Transversal packing turbo-coded Reed-Solomon codewords into the payload fields of MPEG-2-compatible null data packets increases the capability of those turbo-coded Reed-Solomon codewords to overcome burst errors. Repeated transmissions of the transversally packed turbo-coded Reed-Solomon codewords in whole or in part allows them to overcome protracted deep fades encountered during mobile reception of 8VSB DTV signals.

    摘要翻译： 在8VSB广播DTV信号中更健壮地传输的数据是使用并行级联卷积编码（PCCC）进行turbo编码，并且并入数据字段的段内，其字节在网格编码和8VSB符号映射之前进行卷积交织。 将PCCC包装到与MPEG-2兼容的空数据分组的有效载荷字段中，并且Reed-Solomon对分组进行编码，以生成数据字段的段，其字节被卷积交织，使传统的DTV接收机无视对它们无用的PCCC组件 。 横向包装turbo编码的Reed-Solomon码字进入MPEG-2兼容零数据包的有效载荷字段增加了那些turbo编码的里德 - 所罗门码字来克服突发错误的能力。 横向包装涡轮编码的Reed-Solomon码字的重复传输全部或部分地允许它们克服在8VSB DTV信号的移动接收期间遇到的长时间的深度衰落。

    Time-dependent trellis coding for more robust digital television signals
    9.
    发明授权
    Time-dependent trellis coding for more robust digital television signals 有权
    时间依赖网格编码更强大的数字电视信号

    公开(公告)号：US08311141B2

    公开(公告)日：2012-11-13

    申请号：US12692206

    申请日：2010-01-22

    申请人： Allen LeRoy Limberg

    发明人： Allen LeRoy Limberg

    IPC分类号： H04L23/02 ,  H04L5/12

    CPC分类号： H04L1/006 ,  H04L1/0054 ,  H04L1/0071

    摘要： Different sets symbols are precluded at prescribed times in time-dependent trellis coding. This increases the distances between different individual symbols as well as the distances between trellis codes, which increases the robustness of data transmission. The symbols that are precluded in this time-dependent trellis coding are determined in advance according to a prescribed pattern, which pattern does not depend on the history of previous symbols. The Viterbi decoder used for trellis decoding in a receiver can be designed to take advantage of knowledge concerning which different sets of symbols are precluded at prescribed times.

    摘要翻译： 不同的集合符号在时间依赖格网编码的规定时间被排除。 这增加了不同单个符号之间的距离以及网格码之间的距离，这增加了数据传输的鲁棒性。 根据规定的图案预先确定在该时间依赖网格编码中排除的符号，该图案不依赖于先前符号的历史。 在接收机中用于网格解码的维特比解码器可被设计为利用关于在规定时间排除哪些不同符号的知识。