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1.发明授权Method and apparatus for interleaver synchronization in an orthogonal frequency division multiplexing (OFDM) communication system 有权用于正交频分复用（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
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。
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2.发明授权Method and apparatus for establishing interleaver synchronization in an orthogonal frequency division multiplexing (OFDM) communication system 失效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
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。
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公开(公告)号：US06625113B1
公开(公告)日：2003-09-23
申请号：US09386092
申请日：1999-08-30
申请人： Robert L. Cupo , Mohsen Sarraf , Mojtaba Shariat
发明人： Robert L. Cupo , Mohsen Sarraf , Mojtaba Shariat
IPC分类号： H04J1100
CPC分类号： H04L27/2655 , H04L7/007 , H04L27/2601 , H04L27/2607 , H04L27/2656
摘要： A receiver of digital information typically performs a frame synchronization finction to locate the beginning of a frame of within received information. Frame and interleaver synchronization functions are complex tasks to accomplish, and are made more so when transmitted information is subjected to harsh interference by the environment of the transmission media, e.g., wireless media. Such interference may be sufficiently minimized by filtering the band signal at the receiver in a simple manner to allow receiver processes to perform successfully frame synchronization and interleaver functions on the filtered signal, in which such filtering may be achieved using a simple bandpass filter. Although such filtering renders the received signal sufficiently clean to recover frame synchronization and interleaver signals, it nevertheless corrupts the information carried in the signal, thereby making it extremely difficult to recover the information. This problem is overcome by shifting the unfiltered received signal in the way used to shift the filtered signal to locate the beginning of a frame and thus recover the underlying information.
摘要翻译： 数字信息的接收机通常执行帧同步功能以定位接收的信息内的帧的开始。 帧和交织器同步功能是完成的复杂任务，并且当传输的信息受到诸如无线媒体之类的传输媒体的环境的苛刻干扰时更加如此。 通过以简单的方式对接收机处的频带信号进行滤波可以充分地减小这种干扰，以允许接收机处理在滤波信号上执行成功的帧同步和交织器功能，其中可以使用简单的带通滤波器来实现这种滤波。 虽然这种过滤使接收到的信号足够清洁以恢复帧同步和交织器信号，但是它仍然破坏信号中携带的信息，从而使得恢复信息非常困难。 通过以用于移位滤波信号的方式移位未滤波的接收信号来定位帧的开始并因此恢复基础信息来克服该问题。
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公开(公告)号：US06377566B1
公开(公告)日：2002-04-23
申请号：US09049985
申请日：1998-03-30
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。
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公开(公告)号：US06347071B1
公开(公告)日：2002-02-12
申请号：US09170057
申请日：1998-10-13
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。
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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
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。
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7.发明授权Asymmetric pulse amplitude modulation transmission of multi-stream data embedded in a hybrid IBOC channel 有权嵌入在混合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
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。
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8.发明授权Method and receiver for dynamically compensating for interference to a frequency division multiplex signal 有权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
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。
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公开(公告)号：US20050043030A1
公开(公告)日：2005-02-24
申请号：US10646596
申请日：2003-08-22
申请人： Mojtaba Shariat , Xue Yan
发明人： Mojtaba Shariat , Xue Yan
IPC分类号： H04L12/56 , H04W4/18 , H04W28/06 , H04W80/00 , H04W84/04 , H04W88/08 , H04W88/12 , H04W88/16 , H04Q7/00
摘要： A communications system has, a base station (40) and an inter-working gateway (48) for operating two-way wireless Internet communications over a Universal Mobile Telecommunications System (UMTS) communications network. The Internet communications are segmented and multiplexed into framing protocol-protocol data units (FP-PDUs) to operate over the UMTS communications network.
摘要翻译： 通信系统具有用于通过通用移动电信系统（UMTS）通信网络来操作双向无线因特网通信的基站（40）和互通网关（48）。 因特网通信被分段并复用到成帧协议数据单元（FP-PDU）中，以在UMTS通信网络上操作。
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