公开(公告)号：US5949796A

公开(公告)日：1999-09-07

申请号：US666985

申请日：1996-06-19

Applicant: Derek D. Kumar

Inventor： Derek D. Kumar

IPC: H04H20/33 ,  H04L1/00 ,  H04J1/05 ,  H04J1/12

CPC classification number: H04H20/22 ,  H04H20/33 ,  H04L1/0066 ,  H04L1/007 ,  H04H2201/183 ,  H04H2201/20 ,  H04L1/0069 ,  H04L5/0005

Abstract: A method and system are provided for the transmission and reception of an In-band On-channel (IBOC) FM-band digital audio broadcast (DAB) signal. The IBOC DAB signal is generated in the transmitter to substantially occupy the upper and lower sideband frequency regions in the RF emission mask for the conventional broadcast analog FM-band. Redundant source bit information is transmitted in both the upper and lower sidebands so that the loss of information in either one but not both sidebands due to large amounts of interference or distortion, caused by, for example, first-adjacent interference, does not deleteriously affect the IBOC DAB receiver performance. The system exhibits both frequency-diversity and time-diversity. The receiver determines which codeword bit estimate, corresponding to either upper or lower sideband signals, is less likely to be erroneous. The receiver system selects between decoded estimates for each pair of demodulated ECC codewords or combines both ECC codeword estimates prior to decoding in certain embodiments.

公开(公告)号：US5862186A

公开(公告)日：1999-01-19

申请号：US566073

申请日：1995-12-01

Applicant: Derek D. Kumar

Inventor： Derek D. Kumar

IPC: H04B1/707 ,  H04L1/00 ,  H04L27/06

CPC classification number: H04L1/0057 ,  H04B1/707 ,  H04L1/0059

Abstract: A method and system are provided for the reception of a biorthogonally-modulated RF signal in a simplex free-space system. The method is found to substantially diminish the coupling between the error probabilities of those bits associated with signal selection and those bits associated with signal polarity in prior art biorthogonal receivers. By decoupling the error probabilities, the polarity information error rate is reduced and consequently the overall error rate of the receiver system is improved. The receiver system preserves soft-decision reliability information for the signal selection bits in a manner so that the information is insensitive to uncompensated amplitude fluctuations in the received signal. The method and system are applicable to all known biorthogonal signal sets but requires a specific interleaving structure in the corresponding transmitter system.

Abstract translation: 提供了一种在单工自由空间系统中接收双向自调制的RF信号的方法和系统。 发现该方法基本上减少了与现有技术的双正交接收机相关联的那些与信号选择相关的位的误差概率与与信号极性相关的位的耦合。 通过去除误差概率，降低了极性信息误差率，从而提高了接收机系统的总体错误率。 接收机系统以这样的方式保留信号选择比特的软判决可靠性信息，使得信息对接收信号中未补偿的振幅波动不敏感。 该方法和系统适用于所有已知的双正交信号组，但在相应的发射机系统中需要特定的交织结构。

公开(公告)号：US6005894A

公开(公告)日：1999-12-21

申请号：US832813

申请日：1997-04-04

Applicant: Derek D. Kumar

Inventor： Derek D. Kumar

IPC: H03C5/00 ,  H03D5/00 ,  H04H20/30 ,  H04H20/36 ,  H04L27/02

CPC classification number: H03D5/00 ,  H03C5/00 ,  H04H20/36 ,  H04H20/30 ,  H04H2201/186

Abstract: A method and system are provided for the transmission and reception of a composite radio-frequency (RF) signal including a supplemental signal, preferably representing encoded digital information, together with an analog signal which represents monophonic analog audio in the AM-band. The analog monophonic component of the composite signal may be received by conventional AM-band audio receivers. In certain embodiments, the analog signal is a single-sideband large-carrier or vestigial-sideband large-carrier signal, and the composite RF signal includes a digital signal whose spectrum is substantially confined in one inner sideband. In other embodiments, a baseband digital signal is combined with an analog monophonic audio signal and transmitted in upper inner and lower inner sidebands using nonlinear compatible quadrature amplitude modulation (NC-QAM). Additional digital signals' spectrum occupies the lower outer and upper outer sidebands. In certain embodiments, for each transmitted codeword, part of the codeword information is replicated by modulated signals in both the upper outer and lower outer sidebands, preferably with diversity delay between the outer sideband signals.

Abstract translation: 提供了一种方法和系统，用于发送和接收包括补充信号的复合射频（RF）信号，优选地表示编码的数字信息，以及在AM频带中表示单声道模拟音频的模拟信号。 复合信号的模拟单声道分量可以由传统的AM频带音频接收机接收。 在某些实施例中，模拟信号是单边带大载波或残留边带大载波信号，并且复合RF信号包括其频谱基本上限制在一个内边带中的数字信号。 在其他实施例中，基带数字信号与模拟单声道音频信号组合，并使用非线性兼容正交幅度调制（NC-QAM）在上内侧和下侧边带中传输。 附加的数字信号频谱占据了较低的外侧和外侧边带。 在某些实施例中，对于每个发送的码字，码字信息的一部分由上外外边带和下外边带中的调制信号复制，优选地在外边带信号之间具有分集延迟。

公开(公告)号：US5825807A

公开(公告)日：1998-10-20

申请号：US554364

申请日：1995-11-06

Applicant: Derek D. Kumar

Inventor： Derek D. Kumar

IPC: H04B1/707 ,  H04J11/00 ,  H04L1/00 ,  H04L27/227 ,  H04B1/69

CPC classification number: H04L1/0071 ,  H04B1/707 ,  H04J11/0023 ,  H04L1/004 ,  H04L27/2278

Abstract: A method and system are provided for the synchronous transmission and reception of multiplexed digital signals such as spread spectrum. The system uses biorthogonal modulation of a plurality of orthogonal signals, preferably wideband, together with simultaneous orthogonal multiplexing. The method is found to significantly mitigate the crosscorrelation interference that is caused by the interaction between the multiplexed signals. The system transmits a lesser number of multiplexed orthogonal signals than would be required in the corresponding antipodal system, thereby reducing the crosscorrelation interference, while maintaining the same information throughput. The bit error rate of the system is reduced. The method combines aspects of unequal error protection (UEP) error correction coding (ECC) with a receiver architecture for biorthogonal signals. The system exhibits a signal-to-noise ratio (SNR) improvement in the detection of some fraction of the encoded digital data bits. This facilitates the use of additional error control redundancy in the remaining data bits, which results in an overall improvement in the decoded error rate performance.

Abstract translation: 提供了用于同步发送和接收诸如扩展频谱的复用数字信号的方法和系统。 该系统使用多个正交信号，优选宽带的双正交调制，以及同时正交复用。 发现该方法显着地减轻由多路复用信号之间的相互作用引起的互相关干扰。 系统发送比相应的对称系统中要求少的多路复用正交信号，从而在保持相同信息吞吐量的同时减少互相关干扰。 系统的误码率降低。 该方法将不平等误差保护（UEP）纠错编码（ECC）与用于双正交信号的接收机架构相结合。 该系统在检测编码的数字数据位的一部分中表现出信噪比（SNR）的改善。 这有助于在剩余数据位中使用额外的错误控制冗余，这导致解码错误率性能的总体改进。

公开(公告)号：US5748677A

公开(公告)日：1998-05-05

申请号：US586214

申请日：1996-01-16

Applicant: Derek D. Kumar

Inventor： Derek D. Kumar

IPC: H04J1/12 ,  H04L1/00 ,  H04L7/04 ,  H04B15/00

CPC classification number: H04J1/12 ,  H04L1/004 ,  H04L7/041

Abstract: A method and system are provided for the transmission and reception of a varying reference signal together with a data-modulated signal in a communication system. The reference signal is modulated by multiplying it by a predetermined reference value sequence and is summed together with the data-modulated signal in the transmitter system. The reference signal and reference value sequence generators are identically embodied in both the transmitter and receiver systems. The receiver system determines an estimate of the transmitted reference signal by canceling the effect of the reference signal modulation. The estimated reference signal may be removed from the received signal prior to demodulation of the data-modulated signal by subtracting the unmodulated reference signal estimate, which is multiplied in the receiver system with the known reference value sequence.

Abstract translation: 提供了一种用于在通信系统中发送和接收变化的参考信号以及数据调制信号的方法和系统。 通过将参考信号乘以预定的参考值序列来调制参考信号，并将其与发射机系统中的数据调制信号相加。 参考信号和参考值序列发生器同样体现在发射机和接收机系统中。 接收机系统通过消除参考信号调制的影响来确定所传输的参考信号的估计。 在解调数据调制信号之前，可以通过减去在接收机系统中以已知的参考值序列相乘的未调制的参考信号估计，来将所估计的参考信号从接收信号中去除。

公开(公告)号：US6014407A

公开(公告)日：2000-01-11

申请号：US914456

申请日：1997-08-19

Applicant: Bill J. Hunsinger ,  Derek D. Kumar

Inventor： Bill J. Hunsinger ,  Derek D. Kumar

IPC: H04B1/40 ,  H04B1/707 ,  H04B1/7097 ,  H04H20/33 ,  H04J9/00 ,  H04J11/00 ,  H04J13/00 ,  H04J13/02 ,  H04L5/02 ,  H04L27/26 ,  H04K1/00

CPC classification number: H04L27/2601 ,  H04B1/406 ,  H04B1/707 ,  H04B1/7097 ,  H04H20/33 ,  H04J9/00 ,  H04L5/023 ,  H04H20/22 ,  H04H2201/183

Abstract: A system and method for transmitting digital information through a medium such as atmospheric free-space includes a transmitter which generates a signal based on a basis set of mutually orthogonal, spectrally-shaped, sequences of substantially equal length and having predetermined autocorrelation values. The sequences may resemble noise in at least some of their characteristics. The orthogonality or cross-correlation characteristics, the autocorrelation characteristics and the resemblance to noise are due to features derived from sequences of pseudo-random numbers which themselves resemble noise in at least some of their characteristics. The waveform set based on the sequences is modulated digitally. The modulated set may be summed together along with a wideband reference signal of reduced amplitude and optionally an FM analog signal to form a composite signal which is broadcast typically through free space to at least one receiver. The receiver separates the analog FM signal from the digital signal and thereafter demodulates the digital data-carrying waveforms and outputs a stream of digital data. It has been determined to be resistant to multipath degradation.

公开(公告)号：US5966401A

公开(公告)日：1999-10-12

申请号：US579144

申请日：1995-12-27

Applicant: Derek D. Kumar

Inventor： Derek D. Kumar

IPC: H04B1/707 ,  H04B1/709 ,  H04L1/00 ,  H04B15/00

CPC classification number: H04L1/0071 ,  H04B1/707 ,  H04B1/709 ,  H04L1/0045

Abstract: A method and system are provided for the reception of a biorthogonally-modulated RF signal in a simplex free-space system. The method is found to substantially diminish the coupling between the error probabilities of those bits associated with signal selection and those bits associated with signal polarity in prior art biorthogonal receivers. By decoupling the error probabilities, the polarity information error rate is reduced and consequently the overall error rate of the receiver system is improved. The receiver system preserves soft-decision reliability information for the signal selection bits in a manner so that the information is insensitive to uncompensated amplitude fluctuations in the received signal. A symbol deinterleaver in the receiver is located between the correlators and the bit estimators. The method and system are applicable to all known biorthogonal signal sets but requires a specific interleaving structure in the corresponding transmitter system.

Abstract translation: 提供了一种在单工自由空间系统中接收双向自调制的RF信号的方法和系统。 发现该方法基本上减少了与现有技术的双正交接收机相关联的那些与信号选择相关的位的误差概率与与信号极性相关的位的耦合。 通过去除误差概率，降低了极性信息误差率，从而提高了接收机系统的总体错误率。 接收机系统以这样的方式保留信号选择比特的软判决可靠性信息，使得信息对接收信号中未补偿的振幅波动不敏感。 接收机中的符号解交织器位于相关器和位估计器之间。 该方法和系统适用于所有已知的双正交信号组，但在相应的发射机系统中需要特定的交织结构。