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1. 发明授权

US06765929B1 Method and apparatus for combining signals 失效
标题翻译：用于组合信号的方法和装置
公开(公告)号：US06765929B1
公开(公告)日：2004-07-20
申请号：US09245295
申请日：1999-02-05
申请人： Robert Louis Cupo , E Anthony Hinds
发明人： Robert Louis Cupo , E Anthony Hinds
IPC分类号： H04B104
CPC分类号： H04H20/46 , H03C5/00 , H04B1/0483 , H04H20/72 , H04H2201/183 , H04H2201/20
摘要： An FM transmitter forms a Digital Audio Broadcasting (DAB) signal comprising a digital FM signal and an analog FM signal. The FM transmitter comprises an RF nonlinear amplifier coupled to a first antenna and an RF linear amplifier coupled to a second antenna. The RF non-linear amplifier and antenna transmit the analog FM signal. The RF linear amplifier and antenna transmit the digital FM signal. The FM transmitter controls the signal transmissions such that the transmitted analog FM signal and the transmitted digital FM signal are combined, or multiplexed, together in the channel itself (here, the atmosphere) to form the DAB signal.
摘要翻译： FM发射机形成包括数字FM信号和模拟FM信号的数字音频广播（DAB）信号。 FM发射机包括耦合到第一天线的RF非线性放大器和耦合到第二天线的RF线性放大器。 RF非线性放大器和天线发射模拟FM信号。 RF线性放大器和天线发射数字FM信号。 FM发射机控制信号传输，使得传输的模拟FM信号和发射的数字FM信号在信道本身（这里是大气）中组合或复用在一起，以形成DAB信号。

2. 发明授权

US06661771B1 Method and apparatus for interleaver synchronization in an orthogonal frequency division multiplexing (OFDM) communication system 有权
标题翻译：用于正交频分复用（OFDM）通信系统中的交织器同步的方法和装置
公开(公告)号：US06661771B1
公开(公告)日：2003-12-09
申请号：US09398501
申请日：1999-09-17
申请人： Robert Louis Cupo , Muhammad R. Karim , Mojtaba Shariat , Mohammad Hossein Zarrabizadeh
发明人： Robert Louis Cupo , Muhammad R. Karim , Mojtaba Shariat , Mohammad Hossein Zarrabizadeh
IPC分类号： H04J1100
CPC分类号： H04L1/0071 , H04L27/2607 , H04L27/2655 , H04L27/2678
摘要： Interleaving methods and apparatus are disclosed for an in-band on-channel digital audio broadcasting system. The guard periods that separate any two adjacent symbols in a conventional OFDM system can provide a mechanism for OFDM frame synchronization. The guard period of successive OFDM frames is utilized to establish one or more unique positive or negative patterns and thereby provide a mechanism for interleaver synchronization. By proper positioning of the guard period patterns, one or more particular portions of each interleaver block are identified, such as the beginning and midpoint of each interleaver block. The present invention identifies the beginning of each interleaver block, for example, by positioning the fourth negative cyclic prefix with OFDM frame zero (0). The present invention can optionally identify the midpoint of each interleaver block, for example, by positioning the fourth negative cyclic prefix with OFDM frame 206. The beginning of an interleaver block can be distinguished from the midpoint using a unique cyclic prefix pattern. A receiver monitors the incoming data stream for a synchronization pattern to (i) establish interleaver synchronization, (ii) detect when synchronization is lost, and (iii) detect and correct a false synchronization.
摘要翻译：公开了用于带内同频数字音频广播系统的交织方法和装置。在常规OFDM系统中分离任何两个相邻符号的保护周期可以提供用于OFDM帧同步的机制。连续OFDM帧的保护周期用于建立一个或多个唯一的正或负模式，从而提供交织器同步的机制。通过保护周期模式的适当定位，识别每个交织器块的一个或多个特定部分，诸如每个交织器块的开始点和中点。本发明例如通过将具有OFDM帧零（0）的第四负循环前缀定位，来标识每个交织器块的开始。本发明可以例如通过将第四负循环前缀与OFDM帧206进行定位来可选地识别每个交织器块的中点。交织器块的开始可以使用唯一的循环前缀模式与中点区分开。接收机监视输入数据流的同步模式，以（i）建立交织器同步，（ii）检测同步丢失时，以及（iii）检测和纠正错误同步。

3. 发明授权

US06853686B1 Frame formatting technique 有权
标题翻译：帧格式化技术
公开(公告)号：US06853686B1
公开(公告)日：2005-02-08
申请号：US09483725
申请日：2000-01-14
申请人： Robert Louis Cupo , Yong J. Lee , Mojtaba Shariat
发明人： Robert Louis Cupo , Yong J. Lee , Mojtaba Shariat
IPC分类号： H04L1/00 , H04L27/00 , H04L27/26
CPC分类号： H04L27/2614 , H04L1/0083
摘要： A frame formatting technique for filling a fixed length master frame with a number of variable length frames and adding additional data to synchronize the individual variable length frames and increase the randomness of the fixed length master frame. The technique fills unused portions of the fixed length master frame with random data to maximize the randomness of the fixed length master frame which can be used to produce a well behaved modulated signal for digital broadcasting, thereby increasing the efficiency of digital broadcasting system.
摘要翻译：一种用于填充具有多个可变长度帧的固定长度主帧的帧格式化技术，并且添加附加数据以同步各个可变长度帧并增加固定长度主帧的随机性。该技术用随机数据填充固定长度主帧的未使用部分，以使固定长度主帧的随机性最大化，可以用于产生用于数字广播的良好行为调制信号，从而提高数字广播系统的效率。

4. 发明授权

US06650717B1 Asymmetric pulse amplitude modulation transmission of multi-stream data embedded in a hybrid IBOC channel 有权
标题翻译：嵌入在混合IBOC通道中的多流数据的非对称脉冲幅度调制传输
公开(公告)号：US06650717B1
公开(公告)日：2003-11-18
申请号：US09293851
申请日：1999-04-19
申请人： Robert Louis Cupo , Mohsen Sarraf , Mojtaba Shariat , Mohammad Hossein Zarrabizadeh
发明人： Robert Louis Cupo , Mohsen Sarraf , Mojtaba Shariat , Mohammad Hossein Zarrabizadeh
IPC分类号： H03K702
CPC分类号： H03K7/02 , H04H20/30 , H04H2201/186 , H04L5/06 , H04L27/02
摘要： In accordance with the principles of the present invention, in addition to conventional use of frequency division multiplexed upper and lower side bands, the spectral area occupied by the analog host will be utilized by applying a one-dimensional modulation, e.g., pulse amplitude modulation (PAM) as opposed to the conventional use of a two-dimensional modulation, e.g., quadrature amplitude modulation (QAM). Furthermore, the analog and digital information within the analog host bandwidth may be combined in quadrature to keep the signals orthogonal. Thus, should one side band under the analog carrier be deteriorated or obliterated by adjacent channel interference, the other side band under the analog carrier can still provide useful data and hence better digital audio codec performance. By transmitting one or two digital data streams asymmetrically with respect to the center frequency, particular digital side bands can be rendered useless as environmental conditions warrant (e.g., as they become detrimentally affected by adjacent channel interference), reducing bandwidth capacity but not affecting the quality of the received digital data transmitted in any of the remaining digital side band regions.
摘要翻译：根据本发明的原理，除了常规使用频分多路复用的上下边频带之外，通过应用一维调制（例如，脉冲幅度调制（ PAM），与常规使用二维调制（例如正交幅度调制（QAM））相反。此外，模拟主机带宽内的模拟和数字信息可以被正交组合以保持信号正交。因此，如果模拟载波下的一个边带被相邻信道干扰恶化或消除，则模拟载波下的另一个边带仍然可以提供有用的数据，从而提供更好的数字音频编解码器性能。通过相对于中心频率不对称地发送一个或两个数字数据流，在环境条件允许的情况下（例如，当它们受到相邻信道干扰的不利影响）时，特定的数字边带可能变得无用，减少带宽容量但不影响质量在任何剩余的数字边带区域中发送的接收数字数据。

5. 发明授权

US06603826B1 Method and receiver for dynamically compensating for interference to a frequency division multiplex signal 有权
标题翻译：用于动态补偿对频分复用信号的干扰的方法和接收机
公开(公告)号：US06603826B1
公开(公告)日：2003-08-05
申请号：US09396936
申请日：1999-09-15
申请人： Robert Louis Cupo , Mohsen Sarraf , Mohammad Hossein Zarrabizadeh , Mojtaba Shariat
发明人： Robert Louis Cupo , Mohsen Sarraf , Mohammad Hossein Zarrabizadeh , Mojtaba Shariat
IPC分类号： H04L2508
CPC分类号： H04L1/0045 , H04L1/0068 , H04L1/20 , H04L25/067 , H04L27/2647
摘要： A method and a receiver for reducing adjacent-channel interference to a digitally modulated receive signal evaluates error rates of the receive signal associated with different receive bandwidths of the receive signal. The receiver selects a preferential bandwidth among the different bandwidths based on a suitably low error rate associated with the preferential bandwidth. The selection of the different bandwidths is achieved by digital signal processing that weighs desired data bits representing a desired bandwidth differently than rejected data bits representing a rejected bandwidth.
摘要翻译：用于减少对数字调制接收信号的相邻信道干扰的方法和接收机评估与接收信号的不同接收带宽相关联的接收信号的误码率。接收机基于与优先带宽相关联的适当低的错误率来选择不同带宽中的优先带宽。通过数字信号处理来实现不同带宽的选择，该数字信号处理与表示被拒绝的带宽的被拒绝的数据位不同地重叠表示期望带宽的所需数据位。

6. 发明授权

US06377566B1 OFDM subcarrier hopping in a multi service OFDM system 失效
标题翻译： OFDM业务OFDM系统中的OFDM子载波跳频
公开(公告)号：US06377566B1
公开(公告)日：2002-04-23
申请号：US09049985
申请日：1998-03-30
申请人： Robert Louis Cupo , Mohsen Sarraf , Mojtaba Shariat , Mohammad Hossein Zarrabizadeh
发明人： Robert Louis Cupo , Mohsen Sarraf , Mojtaba Shariat , Mohammad Hossein Zarrabizadeh
IPC分类号： H04J102
CPC分类号： H04H20/44 , H04H20/72 , H04H2201/183 , H04H2201/20 , H04L5/023
摘要： An OFDM subcarrier method and apparatus effectively reassigns subcarriers with respect to a data stream from a plurality of Digital Audio Broadcast (DAB) services or programs to reduce selective effects (e.g., selective channel fading) of the transmission channel (e.g., an FM station) on some of the DAB services or programs but not on others. In one embodiment, a symbol reassignment encoder at the transmitter shuffles the data or symbols in the data stream from the DAB services to effectively reassign the subcarriers used by each of the DAB services. The reassignment spreads the selective effects of the transmission channel, e.g., channel fading, over a larger group of DAB services, to improve the robustness and quality of the overall transmission channel.
摘要翻译： OFDM子载波方法和装置相对于来自多个数字音频广播（DAB）服务或程序的数据流有效地重新分配副载波，以减少传输信道（例如FM站）的选择性效应（例如，选择性信道衰落）在一些民建联的服务或计划，而不是其他。在一个实施例中，发射器处的符号重新分配编码器将来自DAB服务的数据流中的数据或符号混洗，以有效地重新分配由每个DAB服务使用的子载波。重新分配扩展传输信道的选择性效应，例如，信道衰落，在更大的DAB服务组上，以提高整体传输信道的鲁棒性和质量。

7. 发明授权

US06347071B1 Time division multiplexed transmission of OFDM symbols 有权
标题翻译： OFDM符号的时分复用传输
公开(公告)号：US06347071B1
公开(公告)日：2002-02-12
申请号：US09170057
申请日：1998-10-13
申请人： Robert Louis Cupo , Mohsen Sarraf , Mojtaba Shariat , Mohammad Hossein Zarrabizadeh
发明人： Robert Louis Cupo , Mohsen Sarraf , Mojtaba Shariat , Mohammad Hossein Zarrabizadeh
IPC分类号： H04J1100
CPC分类号： H04L5/023
摘要： An orthogonal frequency division multiplexing (OFDM) technique which is time division multiplexed to reduce the overall effect on individual services from conditions such as selective fading. In accordance with the principles of the present invention, all available subcarriers in a channel are assigned to fewer than all of the requesting services, e.g., to just one particular service for a period of time. The period of time is preferably independent of the length of a conventional data frame. Thereafter, a second service is assigned access to the use of all available subcarriers for a period of time corresponding to its required bandwidth, and so on until all requesting services are allotted a portion of time for access to all available subcarriers. Any one service may utilize any number of the available subcarriers in a particular superframe containing one cycle of transmissions for all services.
摘要翻译：正交频分复用（OFDM）技术，其被时分多路复用以从诸如选择性衰落的条件减少对各个服务的总体影响。根据本发明的原理，信道中的所有可用子载波被分配给少于全部请求服务，例如分配给仅一个特定服务一段时间。该时间段优选地与常规数据帧的长度无关。此后，第二服务被分配对所有可用子载波的使用对应于其所需带宽的一段时间的访问，等等，直到所有请求服务被分配用于访问所有可用子载波的一部分时间。任何一个服务可以在包含用于所有服务的一个传输周期的特定超帧中利用任何数量的可用子载波。

8. 发明授权

US07505396B2 Method and apparatus for establishing interleaver synchronization in an orthogonal frequency division multiplexing (OFDM) communication system 失效
标题翻译：用于在正交频分复用（OFDM）通信系统中建立交织器同步的方法和装置
公开(公告)号：US07505396B2
公开(公告)日：2009-03-17
申请号：US10661300
申请日：2003-09-12
申请人： Robert Louis Cupo , Muhammad R. Karim , Mojtaba Shariat , Mohammad Hossein Zarrabizadeh
发明人： Robert Louis Cupo , Muhammad R. Karim , Mojtaba Shariat , Mohammad Hossein Zarrabizadeh
IPC分类号： H04J11/00 , H04B1/38 , H04L5/16
CPC分类号： H04L1/0071 , H04L27/2607 , H04L27/2655 , H04L27/2678
摘要： Interleaving methods and apparatus are disclosed for an in-band on-channel digital audio broadcasting system. The guard periods that separate any two adjacent symbols in a conventional OFDM system can provide a mechanism for OFDM frame synchronization. The guard period of successive OFDM frames is utilized to establish one or more unique positive or negative patterns and thereby provide a mechanism for interleaver synchronization. By proper positioning of the guard period patterns, one or more particular portions of each interleaver block are identified, such as the beginning and midpoint of each interleaver block. The present invention identifies the beginning of each interleaver block, for example, by positioning the fourth negative cyclic prefix with OFDM frame zero (0). The present invention can optionally identify the midpoint of each interleaver block, for example, by positioning the fourth negative cyclic prefix with OFDM frame 206. The beginning of an interleaver block can be distinguished from the midpoint using a unique cyclic prefix pattern. A receiver monitors the incoming data stream for a synchronization pattern to (i) establish interleaver synchronization, (ii) detect when synchronization is lost, and (iii) detect and correct a false synchronization.
摘要翻译：公开了用于带内同频数字音频广播系统的交织方法和装置。在常规OFDM系统中分离任何两个相邻符号的保护周期可以提供用于OFDM帧同步的机制。连续OFDM帧的保护周期用于建立一个或多个唯一的正或负模式，从而提供交织器同步的机制。通过保护周期模式的适当定位，识别每个交织器块的一个或多个特定部分，诸如每个交织器块的开始点和中点。本发明例如通过将具有OFDM帧零（0）的第四负循环前缀定位，来标识每个交织器块的开始。本发明可以例如通过将第四负循环前缀与OFDM帧206进行定位来可选地识别每个交织器块的中点。交织器块的开始可以使用唯一的循环前缀模式与中点区分开。接收机监视输入数据流的同步模式，以（i）建立交织器同步，（ii）检测同步丢失时，以及（iii）检测和纠正错误同步。

9. 发明授权

US06961393B1 In-band-on-channel (IBOC) system and methods of operation using orthogonal frequency division multiplexing (OFDM) with timing and frequency offset correction 有权
标题翻译：带内通道（IBOC）系统和使用正交频分复用（OFDM）的定时和频率偏移校正的操作方法
公开(公告)号：US06961393B1
公开(公告)日：2005-11-01
申请号：US09352404
申请日：1999-07-14
申请人： Robert Louis Cupo , Muhammad R. Karim
发明人： Robert Louis Cupo , Muhammad R. Karim
IPC分类号： H03D1/00 , H04L27/26
CPC分类号： H04L27/2647
摘要： An OFDM receiver recovers an rf signal as in-phase (I) and quadrature phase (Q) components of a baseband signal sampled in an A/D converter. The I and Q components of a received symbol are correlated at all sampling points. Correlation values are averaged over the latest L frames and saved in an L-deep FIFO. Symbol amplitude and phase are computed and passed to an offset estimator and an OFDM frame synchronization estimator. A phase-locked loop oscillator provides a sample number identifying the OFDM frame boundary to the offset estimator. An estimated offset value is selected as the negative of the phase angle of the auto correlation.
摘要翻译： OFDM接收机作为在A / D转换器中采样的基带信号的同相（I）和正交相位（Q）分量来恢复rf信号。所有采样点的接收符号的I和Q分量相关。相关值在最近的L帧上进行平均，并保存在L深FIFO中。计算符号幅度和相位并将其传递到偏移估计器和OFDM帧同步估计器。锁相环振荡器向偏移估计器提供标识OFDM帧边界的采样数。选择估计的偏移值作为自相关的相位角的负值。

10. 发明授权

US06501810B1 Fast frame synchronization 有权
标题翻译：快速帧同步
公开(公告)号：US06501810B1
公开(公告)日：2002-12-31
申请号：US09170174
申请日：1998-10-13
申请人： Mohammad Rez Karim , Robert Louis Cupo , Mohsen Sarraf , Mohammad Zarrabizadeh
发明人： Mohammad Rez Karim , Robert Louis Cupo , Mohsen Sarraf , Mohammad Zarrabizadeh
IPC分类号： H04L700
CPC分类号： G08B17/107 , G08B17/113 , G08B29/145 , G08B29/20
摘要： A receiver for receiving synchronized digital transmissions organized in frames, each frame having a frame start, has a clock for generating pulses at time intervals with respect to a time reference and a counter for generating a count of the time intervals with respect to the time reference. A/D converters sample the digital transmission using the pulses from the clock. A cyclic prefix correlator detects the frame start during a count corresponding to an A/D sample. This count is indicative of the time interval during which the frame start was detected with respect to the reference. A memory is provided for storing a plurality (typically 36) counts indicative of the time interval during which the frame start was detected. A pointer is generated from the counts stored in memory. The pointer is indicative of a projected time interval during which a future frame start is expected to arrive. This projected time interval is computed by using a lead/lag digital filter and an oscillator responsive to the digital filter. One or more portions of the receiver are implemented using a programmable signal processor.
摘要翻译：接收机，用于接收以帧为单位组织的同步数字传输，每帧具有帧开始，具有用于相对于时间参考以时间间隔产生脉冲的时钟和用于产生相对于时间参考的时间间隔的计数的计数器。 A / D转换器使用来自时钟的脉冲对数字传输进行采样。循环前缀相关器在对应于A / D采样的计数期间检测帧开始。该计数表示相对于基准检测到帧开始的时间间隔。提供存储器，用于存储指示检测帧开始的时间间隔的多个（通常为36个）计数。从存储在存储器中的计数生成指针。该指示器指示预期未来帧开始到达的预计时间间隔。该预测时间间隔通过使用引导/延迟数字滤波器和响应于数字滤波器的振荡器来计算。使用可编程信号处理器来实现接收机的一个或多个部分。

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