公开(公告)号：US6104442A

公开(公告)日：2000-08-15

申请号：US266753

申请日：1994-06-28

申请人： Chandrakant Bhailalbhai Patel ,  Allen LeRoy Limberg

发明人： Chandrakant Bhailalbhai Patel ,  Allen LeRoy Limberg

IPC分类号： H04N7/015 ,  H03D1/24 ,  H03D5/00 ,  H04B1/28 ,  H04L1/00 ,  H04N5/44

CPC分类号： H04N5/4446 ,  H03D1/24 ,  H03D5/00 ,  H04B1/28 ,  H04L1/0054 ,  H04L27/0008 ,  H04L27/06 ,  H04L27/38 ,  H04N5/4401

摘要： A radio receiver for receiving a selected digital HDTV signal, irrespective of whether it is a complex-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal, using the same tuner. The tuner supplies a final IF signal in a 6 MHz frequency band, the lowest frequency of which is not appreciably more than 2.38 MHz. The final IF signal is digitized for synchrodyning to baseband, with the 2.375 MHz difference between the carrier frequencies of QAM and VSB signals being taken into account in the digital synchrodyning circuitry. The carrier frequencies of the QAM and VSB final IF signals are regulated to be submultiples of symbol frequency by applying automatic frequency and phase control signals developed in the digital circuitry to a local oscillator of the tuner. The presence of the pilot carrier accompanying a selected VSB HDTV signal is detected for automatically switching the radio receiver for operation in a VSB signal reception mode. The absence of pilot carrier accompanying a selected QAM HDTV signal is detected for automatically switching the radio receiver for operation in a QAM signal reception mode.

摘要翻译： 一种用于使用相同的调谐器接收所选数字HDTV信号的无线电接收机，而不管其是复调幅度调制（QAM）还是残留边带（VSB）信号。 调谐器在6 MHz频段提供最终的IF信号，其最低频率不会高于2.38 MHz。 最后的IF信号被数字化以与基带同步，其中在数字同步电路中考虑了QAM和VSB信号的载波频率之间的2.375MHz差。 通过将数字电路中开发的自动频率和相位控制信号应用于调谐器的本地振荡器，QAM和VSB最终IF信号的载波频率被调节为符号频率的分数。 检测伴随选定的VSB HDTV信号的导频载波的存在，以便自动切换无线电接收机以在VSB信号接收模式下操作。 检测到伴随选定的QAM HDTV信号的导频载波的缺失，用于自动切换无线电接收机以进行QAM信号接收模式的操作。

公开(公告)号：US5715012A

公开(公告)日：1998-02-03

申请号：US614471

申请日：1996-03-13

申请人： Chandrakant Bhailalbhai Patel ,  Allen LeRoy Limberg

发明人： Chandrakant Bhailalbhai Patel ,  Allen LeRoy Limberg

IPC分类号： H03D1/24 ,  H03D5/00 ,  H04B1/28 ,  H04L1/00 ,  H04N5/44 ,  H04N5/46

CPC分类号： H04N5/4446 ,  H03D1/24 ,  H03D5/00 ,  H04B1/28 ,  H04L1/0054 ,  H04N5/4401 ,  H04N5/46

摘要： A radio receiver for receiving a selected digital HDTV signal, irrespective of whether it is a quadrature-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal, using the same tuner. The tuner supplies a final IF signal in a 6 MHz frequency band, the lowest frequency of which is not appreciably more than 2.27 MHz. The final IF signal is digitized at a rate that is a multiple of both the symbol frequencies of the QAM and VSB signals, for synchrodyning to baseband, with the 2.375 MHz difference between the carrier frequencies of QAM and VSB signals being taken into account in the digital synchrodyning circuitry. The carrier frequencies of the QAM and VSB final IF signals are regulated to be submultiples of the multiple of both the symbol frequencies of the QAM and VSB signals by applying automatic frequency and phase control signals developed in the digital circuitry to a local oscillator of the tuner.

摘要翻译： 一种用于使用相同调谐器接收所选择的数字HDTV信号的无线电接收机，而不管它是正交幅度调制（QAM）还是残留边带（VSB）信号。 调谐器在6 MHz频段提供最终的IF信号，其最低频率不会高于2.27 MHz。 最后的IF信号以QAM和VSB信号的符号频率的倍数的数字化数字化，用于同步到基带，在QAM和VSB信号的载波频率之间的2.375 MHz差异被考虑在 数字同步电路。 将QAM和VSB最终IF信号的载波频率通过将在数字电路中产生的自动频率和相位控制信号应用于调谐器的本地振荡器来调节为QAM和VSB信号的符号频率的倍数的分数 。

公开(公告)号：US08265129B1

公开(公告)日：2012-09-11

申请号：US09078555

申请日：1998-05-14

申请人： Chandrakant Bhailalbhai Patel ,  Allen LeRoy Limberg

发明人： Chandrakant Bhailalbhai Patel ,  Allen LeRoy Limberg

IPC分类号： H04W4/00

CPC分类号： H04N5/4446 ,  H03D1/24 ,  H03D5/00 ,  H04B1/28 ,  H04L1/0054 ,  H04L27/0008 ,  H04L27/06 ,  H04L27/38 ,  H04N5/4401

摘要： A radio receiver for receiving a selected digital HDTV signal, irrespective of whether it is a complex-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal, using the same tuner. The tuner supplies a final IF signal in a 6 MHz frequency band, the lowest frequency of which is not appreciably more than 2.38 MHz. The final IF signal is digitized for synchrodyning to baseband, with the 2.375 MHz difference between the carrier frequencies of QAM and VSB signals being taken into account in the digital synchrodyning circuitry. The carrier frequencies of the QAM and VSB final IF signals are regulated to be submultiples of symbol frequency by applying automatic frequency and phase control signals developed in the digital circuitry to a local oscillator of the tuner. The presence of the pilot carrier accompanying a selected VSB HDTV signal is detected for automatically switching the radio receiver for operation in a VSB signal reception mode. The absence of pilot carrier accompanying a selected QAM HDTV signal is detected for automatically switching the radio receiver for operation in a QAM signal reception mode.

摘要翻译： 一种用于使用相同的调谐器接收所选数字HDTV信号的无线电接收机，而不管其是复调幅度调制（QAM）还是残留边带（VSB）信号。 调谐器在6 MHz频段提供最终的IF信号，其最低频率不会高于2.38 MHz。 最后的IF信号被数字化以与基带同步，其中在数字同步电路中考虑了QAM和VSB信号的载波频率之间的2.375MHz差。 通过将数字电路中开发的自动频率和相位控制信号应用于调谐器的本地振荡器，QAM和VSB最终IF信号的载波频率被调节为符号频率的分数。 检测伴随选定的VSB HDTV信号的导频载波的存在，以便自动切换无线电接收机以在VSB信号接收模式下操作。 检测到伴随选定的QAM HDTV信号的导频载波的缺失，用于自动切换无线电接收机以进行QAM信号接收模式的操作。

公开(公告)号：US06496230B1

公开(公告)日：2002-12-17

申请号：US09397019

申请日：1999-09-15

申请人： Allen LeRoy Limberg ,  Chandrakant Bhailalbhai Patel

发明人： Allen LeRoy Limberg ,  Chandrakant Bhailalbhai Patel

IPC分类号： H04N544

CPC分类号： H04N5/4446 ,  H04N5/211 ,  H04N5/4401 ,  H04N5/455 ,  H04N21/42607 ,  H04N21/4382

摘要： A plural-conversion digital television signal receiver that embodies the invention upconverts digital television signal from a selected television channel to a UHF initial I-F signal. After image-rejection filtering there is a single-step downconversion of the initial UHF first I-F signal to a low-band final I-F signal, the uppermost frequency of which is in the high-frequency band. The low-band final I-F signal is digitized and demodulated in the digital regime to generate a baseband signal.

摘要翻译： 实现本发明的多转换数字电视信号接收机将数字电视信号从选定的电视频道上变频到UHF初始I-F信号。 在图像抑制滤波之后，将初始UHF第一I-F信号单向下变频到低频最终I-F信号，其最高频率处于高频带。 低频最终I-F信号在数字方式中进行数字化和解调，以产生基带信号。

公开(公告)号：US20210243064A1

公开(公告)日：2021-08-05

申请号：US17237045

申请日：2021-04-22

申请人： Allen LeRoy Limberg

发明人： Allen LeRoy Limberg

IPC分类号： H04L27/26

摘要： Labeling diversity of the superposition coding modulation (SCM) of dual-carrier modulation (DCM) of a coded orthogonal frequency-division multiplexed (COFDM) signal is used to reduce its peak-to-average-power ratio (PAPR). The reduction of data throughput owing to DCM is compensated for by squaring the number of lattice points in SCM mappings of the quadrature amplitude modulation (QAM) of the carriers of the COFDM signal. The labeling diversity can be such as to minimize PAPR or such as to reduce PAPR less, but improve signal-to-noise (SNR) for reception of the COFDM signal transmitted via an additive-white-Gaussian-noise (AWGN) channel.

公开(公告)号：US20180034677A1

公开(公告)日：2018-02-01

申请号：US15641014

申请日：2017-07-03

申请人： Allen LeRoy Limberg

发明人： Allen LeRoy Limberg

IPC分类号： H04L27/26 ,  H04L25/03 ,  H04L1/00 ,  H04L27/00 ,  H04B7/12 ,  H04L27/38

CPC分类号： H04L27/2698 ,  H04B7/0885 ,  H04B7/12 ,  H04L1/005 ,  H04L1/0054 ,  H04L1/0058 ,  H04L1/0071 ,  H04L25/03159 ,  H04L27/0002 ,  H04L27/2649 ,  H04L27/38

摘要： Prior-art receivers for double-sideband coded orthogonal frequency-division modulation (COFDM) signal, such as receivers for digital television (DTV) broadcasting, have folded the frequency spectrum in half by synchrodyne to baseband before discrete Fourier transform (DFT) and de-mapping quadrature amplitude-modulation (QAM) of COFDM signal subcarriers, thus to improve signal-to-noise ratio by 6 dB. Single-sideband or independent-sideband COFDM receivers that perform DFT and demapping of QAM of COFDM signal subcarriers in an unfolded frequency spectrum can improve signal-to-noise ratio by 8.5 dB by maximal-ratio combining bits of demapping results. Such improvement is achieved even when such a receiver is arranged for receiving a DSB-COFDM signal, in which double-sideband signal the frequency spectra of the lower and upper sidebands mirror each other. Reception range is increased by about a third over that of receivers which fold the frequency in half during synchrodyne to baseband. Such increase in reception range is particularly important for DTV receivers using indoor antennas.

公开(公告)号：US08781010B2

公开(公告)日：2014-07-15

申请号：US13065245

申请日：2011-03-17

申请人： Allen LeRoy Limberg

发明人： Allen LeRoy Limberg

IPC分类号： H04L5/12 ,  H04L27/06

CPC分类号： H04L1/0065 ,  H03M13/09 ,  H03M13/1515 ,  H03M13/155 ,  H03M13/27 ,  H03M13/2732 ,  H03M13/2927 ,  H03M13/2948 ,  H03M13/2954 ,  H03M13/2966 ,  H03M13/2972 ,  H03M13/37 ,  H03M13/3746 ,  H03M13/618 ,  H04L1/005 ,  H04L1/0057

摘要： Receivers for recovering ancillary data from parallel concatenated convolutional coding. (PCCC) imbedded in digital television (DTV) signals can utilize the non-systematic (207, 187) Reed-Solomon (RS) codewords included in the DTV signals to facilitate DTV receivers already in the field to continue being able to receive main-service transmissions. Such a receiver attempts to decode each non-systematic (207, 187) RS codeword in a time slot selected for reception. If such RS decoding is successful, indication of such success is used to verify the correctness of bits of the ancillary data or correct them when turbo decoding the PCCC encoding ancillary data in the time slot selected for reception. The updating of ancillary data bits during cycles of turbo decoding updates the non-systematic (207, 187) RS codewords in the time slot selected for reception, increasing the likelihood of RS decoding of those RS codewords being successful during subsequent cycles of turbo decoding. If all the non-systematic (207, 187) RS codewords in the time slot selected for reception are successfully decoded before reaching a prescribed maximum number of cycles of turbo decoding, turbo decoding can be discontinued early to conserve operating power.

摘要翻译： 用于从并行级联卷积编码恢复辅助数据的接收器。 嵌入数字电视（DTV）信号的PCCC（PCCC）可以利用包括在DTV信号中的非系统（207,187）里德 - 所罗门（RS）码字，以便于已经在现场的DTV接收机继续能够接收主 - 服务传输。 这样的接收机尝试在选择用于接收的时隙中解码每个非系统（207,187）RS码字。 如果这样的RS解码成功，则在选择用于接收的时隙中对PCCC编码辅助数据进行turbo解码时，使用这种成功的指示来验证辅助数据的比特的正确性或校正它们。 在turbo解码周期期间，辅助数据比特的更新在选择用于接收的时隙中更新非系统（207,187）RS码字，增加了这些RS码字的RS解码在turbo解码的后续周期期间成功的可能性。 如果在达到规定的最大数量的turbo解码之前成功解码了用于接收的时隙中的所有非系统（207,187）RS码字，则可以尽早中止turbo解码以节省操作功率。

公开(公告)号：US20140161209A1

公开(公告)日：2014-06-12

申请号：US14183264

申请日：2014-02-18

申请人： Allen LeRoy Limberg

发明人： Allen LeRoy Limberg

IPC分类号： H04L1/02 ,  H04L27/01 ,  H04B7/02

CPC分类号： H04L1/02 ,  H04L1/0041 ,  H04L1/0045 ,  H04L1/0065 ,  H04L5/0016 ,  H04L25/067 ,  H04L27/01 ,  H04L27/2627 ,  H04L27/2649 ,  H04L27/36 ,  H04L27/38

摘要： Transmitter apparatus to broadcast coded orthogonal frequency-division multiplexed (COFDM) radio-frequency carriers conveying digital television (DTV) signals encoded using Bose-Chaudhuri-Hocquenghem (BCH) coding concatenated with subsequent low-density parity-check coding (LPDC) transmits the same coded DTV signals twice some time apart. The coded DTV signals are mapped to quadrature amplitude modulation (QAM) of the COFDM carriers. Preferably, the circular Fourier transforms of COFDM symbols in the earlier transmissions are rotated one half revolution respective to the circular Fourier transforms of corresponding COFDM symbols in the later transmissions. Receiver apparatus combines the earlier and later transmissions of twice-transmitted COFDM signals as part of iterative procedures for de-mapping QAM and decoding the concatenated BCH-LDPC coding of the DTV signals.

摘要翻译： 传送使用与随后的低密度奇偶校验编码（LPDC）并置的Bose-Chaudhuri-Hocquenghem（BCH）编码编码的数字电视（DTV）信号的编码的正交频分复用（COFDM）射频载波的发射机装置， 相同的编码DTV信号相隔两次。 编码的DTV信号被映射到COFDM载波的正交幅度调制（QAM）。 优选地，先前传输中的COFDM符号的循环傅里叶变换相应于稍后传输中相应的COFDM符号的循环傅里叶变换旋转了一半。 接收机装置组合了两倍传输的COFDM信号的较早和较晚的传输，作为用于解映射QAM和解码DTV信号的级联的BCH-LDPC编码的迭代过程的一部分。

公开(公告)号：US08649429B2

公开(公告)日：2014-02-11

申请号：US13609054

申请日：2012-09-10

申请人： Allen LeRoy Limberg

发明人： Allen LeRoy Limberg

IPC分类号： H04N7/12

CPC分类号： H04L65/4076 ,  H03M13/2957 ,  H04L65/607 ,  H04N21/2383

摘要： Digital television broadcasting signals employ parallel concatenated convolutional coding, commonly called “turbo coding”, to improve reception by receivers in motor vehicles. Turbo coded Reed-Solomon codewords are transversally disposed in the payload fields of encapsulating MPEG-2-compliant packets to improve the capability of the Reed-Solomon coding to overcome deep fades. Turbo codewords are transmitted more than once in so-called “staggercasting”. Reception of DTV signals is improved by combining soft decisions concerning repeated transmissions of turbo codewords before turbo decoding. Only the data components of turbo codewords are transmitted twice in “punctured” staggercasting of turbo codewords, with parity components being transmitted only once, so code rate is reduced by a smaller factor than two.

摘要翻译： 数字电视广播信号采用平行级联卷积编码，通常称为“turbo编码”，以改善机动车辆中接收机的接收。 Turbo编码的Reed-Solomon码字被横向地布置在封装MPEG-2兼容分组的有效载荷字段中，以提高Reed-Solomon编码克服深度衰落的能力。 Turbo码字在所谓的“交错”中被多次发送。 通过组合关于涡轮解码之前的turbo码字的重复发送的软判决来改善DTV信号的接收。 只有Turbo码字的数据分量在turbo码字的“穿孔”交错广播中被发送两次，其中奇偶校验分量仅被发送一次，因此码率被减少比两个更小的因子。

公开(公告)号：US08418022B2

公开(公告)日：2013-04-09

申请号：US12931688

申请日：2011-02-08

申请人： Allen LeRoy Limberg

发明人： Allen LeRoy Limberg

IPC分类号： H03M13/00

CPC分类号： H03M13/2966 ,  H03M13/1515 ,  H03M13/2972 ,  H03M13/6538

摘要： Non-systematic (207, 187) Reed-Solomon codewords contain valuable information concerning the correctness of the outer convolutional coding of the serial concatenated convolutional coding (SCCC) used for transmitting digital television (DTV) data to mobile/handheld (M/H) receivers. M/H receivers are described that, before and during turbo decoding of the SCCC, decode (207, 187) Reed-Solomon (RS) coding of transport-stream packets encapsulating M/H DTV data. The results of the decoding the RS coding locate bytes in the outer convolutional coding of the SCCC very unlikely to be in error. The confidence levels of bits in those bytes are adjusted accordingly, so turbo decoding of the SCCC converges faster. In M/H receivers of preferred design, the results of decoding RS coded transport-stream packets are used to signal when such convergence is reached, to stop the iterative SCCC decoding procedures before a prescribed maximum number of iterations, thus to conserve operating power.

摘要翻译： 非系统（207,187）里德 - 所罗门码字包含有关用于将数字电视（DTV）数据传输到移动/手持（M / H）的串行级联卷积编码（SCCC）的外部卷积编码的正确性的有价值的信息， 接收器。 描述了在SCCC的turbo解码之前和期间对M / H接收机进行解码（207,187）封装M / H DTV数据的传输流分组的Reed-Solomon（RS）编码。 在SCCC的外部卷积编码中解码RS编码定位字节的结果非常不可能出错。 相应调整这些字节中位的置信水平，因此SCCC的turbo解码速度更快。 在优选设计的M / H接收机中，解码RS编码传输流分组的结果用于在达到这种收敛时发出信号，以在规定的最大迭代次数之前停止迭代SCCC解码过程，从而节省操作功率。