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公开(公告)号：US06424678B1
公开(公告)日：2002-07-23
申请号：US09630235
申请日：2000-08-01
IPC分类号： H04K110
CPC分类号： H04L5/0048 , H04L5/0005
摘要： A scalable pattern methodology defining positions of synchronization symbols, pilot symbols and data symbols for various numbers of sub-channels in a multi-carrier communication system. A base pattern (510) is defined identifying positions of data symbols, synchronization symbols and pilot symbols for a first number of sub-channels corresponding to a first bandwidth. The base pattern is replicated or scaled to form an expanded pattern (512, 514) identifying positions of data symbols, synchronization symbols and pilot symbols for an expanded number (M) of sub-channels corresponding to a second bandwidth. The pattern methodology may be implemented by a transmitter (100) having subdivided an original information signal into M bit streams and having encoded each of the M bit streams to 16QAM symbols to form M symbol streams, by inserting synchronization and pilot symbols into each of the M symbol streams at positions determined by the expanded pattern. The pattern methodology allows a receiver (600) to perform pilot interpolation in the M symbol streams with the same set of pilot interpolation filters that would be required to perform pilot interpolation in the symbol streams of the base pattern.
摘要翻译： 一种定义多载波通信系统中不同数量的子信道的同步符号，导频符号和数据符号的位置的可缩放模式方法。 定义了基本模式（510），其识别与第一带宽对应的第一数量的子信道的数据符号，同步符号和导频符号的位置。 基本模式被复制或缩放以形成识别对应于第二带宽的扩展数目（M）的子信道的数据符号，同步符号和导频符号的位置的扩展模式（512,514）。 模式方法可以由已经将原始信息信号细分为M个比特流并且通过将同步和导频符号插入到每个M比特流中而将每个M比特流编码为16QAM符号以形成M个符号流来实现 M符号流在由扩展模式确定的位置处。 模式方法允许接收机（600）在M个符号流中执行导频内插，其中使用与在基本模式的符号流中进行导频插值所需的导频内插滤波器相同的集合。
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72.发明授权
公开(公告)号：US6160852A
公开(公告)日：2000-12-12
申请号：US22929
申请日：1998-02-12
申请人： Gary W. Grube , Bradley M. Hiben
发明人： Gary W. Grube , Bradley M. Hiben
CPC分类号： H04B1/406
摘要： A method and apparatus for integrated processing of narrow-band communications and wide-band communications is generally accomplished when a communications controller (25) receives a request for a narrow-band communication. The request includes identity of at least one targeted communication device (32). Having received the request, the communications controller determines whether the at least one targeted communication device is participating in a wide-band communication on a wide-band channel. If so, the communications controller causes a narrow-band communication to be mixed with the wide-band communication. The mixed signal is then provided to the at least one targeted communication device on the wide-band channel.
摘要翻译： 当通信控制器（25）接收到对窄带通信的请求时，通常完成窄带通信和宽带通信的集成处理的方法和装置。 该请求包括至少一个目标通信设备（32）的标识。 在接收到请求之后，通信控制器确定至少一个目标通信设备是否正在宽带信道上参与宽带通信。 如果是这样，则通信控制器使窄带通信与宽带通信混合。 然后将混合信号提供给宽带信道上的至少一个目标通信设备。
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公开(公告)号：US5805612A
公开(公告)日：1998-09-08
申请号：US524491
申请日：1995-09-07
IPC分类号： H04L1/00
CPC分类号： H04L1/0057
摘要： An APCO 25 radio communication system 200 includes a repeater 101 arranged to receive signals from an inbound repeater link 103, thereby forming received signals. The repeater 101 is arranged to forward the received signals to a subscriber 121 via an outbound radio frequency path 113. The received signals include two types of packets, namely, packets 105 with correctable errors 107, and "erasure packets"109 with detectable-but-uncorrectable errors 111. The inbound repeater link is equipped with error correcting means 110 for correcting the correctable errors 107. The inbound repeater link is also equipped with error mitigating means 130 for mitigating the detectable-but-uncorrectable errors 111. The error mitigation is performed in accordance with the improved multi-band excitation ("IMBE") process.
摘要翻译： APCO 25无线电通信系统200包括被布置成从入站中继器链路103接收信号的中继器101，从而形成接收信号。 中继器101被布置成经由出站射频路径113将接收到的信号转发给用户121.接收到的信号包括两种类型的分组，即具有可校正错误的分组105，以及具有可检测但是的“擦除分组”109 入站中继器链路配备有用于校正可校正错误107的错误校正装置110.入站中继器链路还配备有用于减轻可检测但不可校正的错误111的误差减轻装置130.错误减轻是 根据改进的多频带激励（“IMBE”）过程进行。
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公开(公告)号：US5796784A
公开(公告)日：1998-08-18
申请号：US624042
申请日：1996-03-27
CPC分类号： H04L27/3488
摘要： In a modulator (300), a symbol weight determiner (301) determines a scaling factor (310) for at least one symbol (308). An integrator (303) and a complex symbol generator (305) operate to produce at least one complex symbol (314) based on the at least one symbol. The scaling factor (310) is used to scale the at least one complex symbol. In one embodiment, a scaler (307) comprises a gain-modifiable amplifier (609) and, in a second embodiment, the scaler comprises a gain-modifiable filter (809). When such a modulator is incorporated into an RF communication device (600, 800), the energy used to transmit any given symbol can be varied according to the relative importance of that symbol. Additionally, the overall received sensitivity of a communication, at a given signal strength, can be improved.
摘要翻译： 在调制器（300）中，符号权重确定器（301）确定至少一个符号（308）的缩放因子（310）。 基于该至少一个符号，积分器（303）和复合符号发生器（305）操作以产生至少一个复合符号（314）。 缩放因子（310）用于缩放至少一个复合符号。 在一个实施例中，缩放器（307）包括可增益修改的放大器（609），并且在第二实施例中，缩放器包括增益可修改的滤波器（809）。 当这种调制器被并入RF通信设备（600,800）中时，用于发送任何给定符号的能量可以根据该符号的相对重要性而变化。 此外，可以提高在给定信号强度下的通信的总体接收灵敏度。
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公开(公告)号：US5719903A
公开(公告)日：1998-02-17
申请号：US495954
申请日：1995-06-28
CPC分类号： H04L27/22 , H04L25/061 , H04L27/0008
摘要： Delayed symbols (204), including a current symbol (205), are compared by a comparator (206) with at least one predetermined pattern when the current symbol is equivalent to one of a set of predetermined values. Alternatively, a sign of the current symbol is compared with signs of a previous and a subsequent symbol when the current symbol is equivalent to one of the set of predetermined values. When the current symbol is equivalent to one of the set of predetermined values and when either the delayed symbols are equivalent to one of the at least one predetermined pattern or the sign of the current symbol matches the signs of the previous and subsequent symbols, a symbol corrector (208) applies a predetermined function to the current symbol to produce a received symbol (210).
摘要翻译： 包括当前符号（205）的延迟符号（204）在当前符号等同于一组预定值之中时，由具有至少一个预定模式的比较器（206）进行比较。 或者，当当前符号等同于该组预定值之一时，将当前符号的符号与先前和后续符号的符号进行比较。 当当前符号等于该组预定值中的一个时，并且当延迟符号等于至少一个预定模式中的一个或当前符号的符号与先前和后续符号的符号匹配时，符号 校正器（208）将预定函数应用于当前符号以产生接收符号（210）。
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76.发明授权Data transmission method and apparatus for use in low BW:R.sub.s applications 失效数据传输方法和装置用于低BW：Rs应用
公开(公告)号：US5541953A
公开(公告)日：1996-07-30
申请号：US383285
申请日：1995-02-03
CPC分类号： H04L27/2067
摘要： A data transmission scheme for use in a low channel bandwidth-to-modulation symbol rate ratio (BW:R.sub.S) application employing a linear modulator for producing in-phase and quadrature (I and Q) components of a data stream inputted at a predetermined symbol rate. This transmission method allows for the recovery of signals having unfavorable delay spread characteristics. That is, a specialized function is used to process the I and Q components, whose time domain transfer characteristic remains within a predetermined range of a data constellation point for a duration that exceeds 25 percent of a symbol period corresponding to the predetermined symbol rate. The processed response is then band-limited to produce a modulation signal that is usable in the low BW:R.sub.S application.
摘要翻译： 一种用于采用线性调制器的低通道带宽到调制符号速率比（BW：RS）应用的数据传输方案，用于产生以预定符号输入的数据流的同相和正交（I和Q）分量 率。 该传输方法允许恢复具有不利延迟扩展特性的信号。 也就是说，使用专门的功能来处理I和Q分量，其时域传输特性保持在数据星座点的预定范围内，持续时间超过对应于预定符号率的符号周期的25％。 然后对经处理的响应进行频带限制，以产生可用于低BW：RS应用的调制信号。
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公开(公告)号：US5465410A
公开(公告)日：1995-11-07
申请号：US343298
申请日：1994-11-22
CPC分类号： H03G5/24 , H04B1/1027 , H04B2001/1054 , H04B2001/1072
摘要： An FM receiver (100) that includes a plurality of filtering elements (120-124) that have various center frequencies and bandwidths that adjust to maximize the signal quality of a desired signal (104) recovers the desired signal (104) by inputting the desired signal (104) to each of the plurality of filtering elements (120-124). Signal recovery is performed on an output of each of the filtering elements (120-124) to obtain a plurality of recovered signals. The recovered signals are then measured to obtain a plurality of signal quality metrics for the desired signal.
摘要翻译： 一种FM接收器（100），其包括具有各种中心频率和带宽的多个滤波元件（120-124），所述多个滤波元件被调整以使所需信号（104）的信号质量最大化，通过输入期望信号（104）来恢复期望信号 信号（104）到多个滤波元件（120-124）中的每一个。 对每个滤波元件（120-124）的输出执行信号恢复以获得多个恢复的信号。 然后测量恢复的信号以获得用于期望信号的多个信号质量度量。
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78.发明授权
公开(公告)号：US5423059A
公开(公告)日：1995-06-06
申请号：US98880
申请日：1993-07-29
CPC分类号： H04H20/67 , H04B7/0671 , H04L1/24
摘要： In a simulcast communication system (100), a communication unit (110-115) may request enhanced coverage area services by transmitting a request for enhanced signal quality to a central simulcast controller (101). Upon receipt, the central simulcast controller (101) identifies, based on information pertaining to the location of the communication unit, a set of transmitters (102-109) to enhance coverage in the area of the communication unit. The central simulcast controller determines enhanced coverage area delays for each of the transmitters and adjusts the respective delays of each transmitter such that transmitted signal quality is enhanced at the location of the communication unit.
摘要翻译： 在联播通信系统（100）中，通信单元（110-115）可以通过向中央联播控制器（101）发送增强信号质量的请求来请求增强的覆盖区域服务。 在接收时，中央联播控制器（101）基于与通信单元的位置相关的信息来识别一组发射机（102-109），以增强通信单元的区域中的覆盖。 中央联播控制器确定每个发射机的增强的覆盖区域延迟，并且调整每个发射机的相应延迟，使得在通信单元的位置增强发射的信号质量。
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公开(公告)号：US5247701A
公开(公告)日：1993-09-21
申请号：US546145
申请日：1990-06-29
申请人： Richard A. Comroe , Arun Sobti , Paul M. Bocci , Robert W. Furtaw , Bradley M. Hiben , James A. McDonald
发明人： Richard A. Comroe , Arun Sobti , Paul M. Bocci , Robert W. Furtaw , Bradley M. Hiben , James A. McDonald
IPC分类号： H04W16/14
CPC分类号： H04W16/14
摘要： Shown, herein, is a method of allowing use of small, low-power communication systems within the service coverage area of larger trunked systems. The small, low-power systems are constructed to reuse at least some of the communication resources, also used by the larger system. The large system measures signal strength values of large cell communication units and transfers such values to the small systems. A small system compares the transferred values with a threshold and when the threshold is exceeded, reuses the communication resources under a TDM format within the small system.
摘要翻译： 这里显示的是允许在较大的集群系统的服务覆盖区域内使用小的，低功率的通信系统的方法。 小型低功率系统被构造为重用至少一些通信资源，也被较大系统使用。 大系统测量大单元通信单元的信号强度值，并将这些值传送给小型系统。 一个小系统将转移的值与阈值进行比较，并且超过阈值时，在小系统内重复使用TDM格式的通信资源。
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公开(公告)号：US5220676A
公开(公告)日：1993-06-15
申请号：US687815
申请日：1991-04-19
IPC分类号： H04H20/67
CPC分类号： H04H20/67
摘要： An improved synchronization method and apparatus, according to the invention, is provided. According to the invention, in a simulcast system having a remote site receiving frames from a base site, each frame containing a predetermined number (k) of transmit sample periods, and the transmit sample clock and remote synchronization clock frequencies known (f.sub.tx and f.sub.pps respectively), the remote site synchronizes a frame as follows. First, it receives a frame from the base site. Second, it determines the sequence number n for the frame. Third, it determines the launch time the first frame was to be broadcast from the remote site. Fourth, it computes a realignment time based on [(n-1)*(k)+launch time for first frame] MOD (f.sub.tx f.sub.pps). Fifth, it transmits the first bit of the frame at the realignment time.
摘要翻译： 提供了根据本发明的改进的同步方法和装置。 根据本发明，在具有从基站接收帧的远程站点的同播系统中，每个帧包含预定数量（k）个发射采样周期，并且已知传输采样时钟和远程同步时钟频率（分别为ftx和fpps ），远程站点如下同步帧。 首先，它从基站接收到一个帧。 其次，它确定帧的序列号n。 第三，它确定从远程站点广播第一帧的发射时间。 第四，它基于[（n-1）*（k）+第一帧的发射时间] MOD（ftxfpps）计算重新调整时间。 第五，它在重新调整时间传输帧的第一位。
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