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1.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：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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公开(公告)号：US5280629A
公开(公告)日：1994-01-18
申请号：US804860
申请日：1991-12-06
CPC分类号： H04H20/67 , H04B17/364 , H04J3/0682
摘要： A method for measuring channel delay measures the delay for a message to propagate from a prime site (100, 400) to a remote site (200, 500) via the channel (300, 600). The prime site includes a clock for providing a first value, T1, based on the current time at the prime site. The remote site includes a clock for providing a second value, T2, based on the current time at the remote site. Both clocks are synchronized with a common timing source, such as a GPS satellite timing signal. Therefore, T2 equals T1. In one embodiment, the prime site determines T1, and simultaneously sends a message to the remote site via the channel, the message including T1. Upon receiving the message, the remote site simultaneously determines T2. The remote site decodes the message to determine T1, and then determines the delay based on the difference between T2 and T1.
摘要翻译： 用于测量信道延迟的方法测量消息经由信道（300,600）从主站点（100,400）传播到远程站点（200,500）的延迟。 主要站点包括基于当前时间在主站点提供第一个值T1的时钟。 远程站点包括基于远程站点当前时间提供第二个值T2的时钟。 两个时钟与公共定时源同步，例如GPS卫星定时信号。 因此，T2等于T1。 在一个实施例中，主站点确定T1，并且同时经由信道向远程站点发送消息，该消息包括T1。 远程站点收到消息后，同时确定T2。 远程站点对消息进行解码以确定T1，然后根据T2和T1之间的差异确定延迟。
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公开(公告)号：US5218621A
公开(公告)日：1993-06-08
申请号：US680460
申请日：1991-04-04
CPC分类号： H04H20/67 , H03H21/0012
摘要： An adaptive digital equalization filter is provided to remedy the differential time delay problem in a digital simulcast system. The digital simulcast system includes an adaptive digital equalization filter with N coefficients, and a fixed analog anti-alias filter. According to the invention, the adaptive digital equalization filter first measures the amount of delay contributed to the output signal by the fixed anti-alias filter. This is accomplished by exciting the anti-alias filter with a unit impulse, and measuring the resulting impulse response. The adaptive filter next determines the characteristics needed to compensate for the amount of measured delay contributed to the output signal by the fixed filter. This is accomplished by computing a new set of N coefficients using the Levinson-Durbin algorithm. The adaptive filter next adjusts its coefficients based on these determined characteristics. Further, the adaptive filter periodically determines when it is time to update the N coefficients.
摘要翻译： 提供了一种自适应数字均衡滤波器来弥补数字同步播放系统中的差分时延问题。 数字联播系统包括具有N个系数的自适应数字均衡滤波器和固定的模拟抗混叠滤波器。 根据本发明，自适应数字均衡滤波器首先通过固定的抗混叠滤波器来测量对输出信号贡献的延迟量。 这是通过用单位脉冲激励抗混叠滤波器并测量所得到的脉冲响应来实现的。 接下来，自适应滤波器确定补偿由固定滤波器对输出信号贡献的测量延迟量所需的特性。 这是通过使用Levinson-Durbin算法计算一组新的N个系数来实现的。 接下来，自适应滤波器基于这些确定的特性来调整其系数。 此外，自适应滤波器周期性地确定何时更新N个系数。
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公开(公告)号：US5423058A
公开(公告)日：1995-06-06
申请号：US197369
申请日：1994-02-17
CPC分类号： H04H20/67
摘要： A simulcast radio transmission system (250) transmits message signals (318) including selective call tones, originating from a message source (202), to a geographical area (115). The simulcast system includes a controller (204) coupled between the message source (202) and a plurality of remote transmitter sites (208, 210) for exchanging message signals (318) including selective call tones therebetween. Connecting the controller (204) to the plurality of transmitter sites (208, 210) are a plurality of interconnect links (224, 226), each having bounded propagation time delay characteristics. The simulcast system (250) employs phase numbers associated with the starting phase of the selective call tones to allow accurate reconstruction of the selective call tones. The controller (204) then combines (508) the message signals (318) with the launch time and the phase number to establish a message bundle and sends the message bundle to at least one of the plurality of transmitters (208, 210), via at least one of the plurality of interconnect links (224, 226).
摘要翻译： 联播无线电传输系统（250）将包括从消息源（202）发起的选择呼叫音调的消息信号（318）发送到地理区域（115）。 联播系统包括耦合在消息源（202）和多个远程发射器站点（208,210）之间的控制器（204），用于交换包括其间的选择呼叫音的消息信号（318）。 将控制器（204）连接到多个发射机站点（208,210）是多个互连链路（224,226），每个互连链路具有有界的传播时间延迟特性。 联播系统（250）使用与选呼通道的起始阶段相关联的相位数，以允许精确重建选呼通道。 然后，控制器（204）将消息信号（508）与发射时间和相位数相组合（508）以建立消息束，并且将消息束发送到多个发射机（208,210）中的至少一个，经由 多个互连链路（224,226）中的至少一个。
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公开(公告)号：US5377229A
公开(公告)日：1994-12-27
申请号：US629931
申请日：1990-12-19
CPC分类号： H04L27/0008
摘要： A transceiver compatible with both wide channel constant envelope 4 level FSK FM modulation and narrow channel .pi./4 differential QPSK linear modulation allows compatible interaction between modified constant envelope and non-constant envelope transmitters. All Nyquist filtering occurs in the transmitters, and none in the receiver.
摘要翻译： 兼容宽通道恒定包络4级FSK FM调制和窄通道pi / 4差分QPSK线性调制的收发器允许修改的恒定包络和非恒定包络发射机之间的兼容交互。 所有奈奎斯特滤波发生在发射机中，接收机中不发生。
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公开(公告)号：US5640430A
公开(公告)日：1997-06-17
申请号：US116197
申请日：1993-09-02
CPC分类号： H04L25/068 , H04B1/16
摘要： In a digital communication system, communication units may reduce power consumption while attempting to detect reception of valid data by sampling and filtering a data stream at a first sampling rate producing a first filtered data stream. When the first filtered data stream indicates potential valid data, the communication unit samples and filters the data stream at a second sampling rate, wherein the second sampling rate is greater than the first sampling rate and consumes more power, producing a second filtered data stream. The communication unit determines whether the data stream contains valid data based on the second filtered data stream.
摘要翻译： 在数字通信系统中，当尝试通过以产生第一经过滤数据流的第一采样率对数据流进行采样和滤波来检测有效数据的接收时，通信单元可以降低功耗。 当第一滤波数据流指示潜在的有效数据时，通信单元以第二采样率对数据流进行采样和滤波，其中第二采样率大于第一采样率，并消耗更多的功率，产生第二滤波数据流。 通信单元基于第二滤波数据流确定数据流是否包含有效数据。
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公开(公告)号：US08537790B2
公开(公告)日：2013-09-17
申请号：US12367483
申请日：2009-02-06
申请人： Mark C. Cudak , Timothy A. Thomas , Frederick W. Vook , Anup K. Talukdar , Fan Wang , Bishwarup Mondal
发明人： Mark C. Cudak , Timothy A. Thomas , Frederick W. Vook , Anup K. Talukdar , Fan Wang , Bishwarup Mondal
IPC分类号： H04W4/00
CPC分类号： H04L5/0007 , H04L1/06 , H04L5/005 , H04L5/0051 , H04L5/0053 , H04L25/03248
摘要： A method for communicating control channel information in a wireless communication system, including transmitting a super-frame having a time-frequency resource region containing an allocation control channel and multiple pilot elements, at least some of which are associated with the allocation control channel, and indicating, in a configuration information control channel of the super-frame, a characteristic of the pilots elements associated with the allocation control channel.
摘要翻译： 一种用于在无线通信系统中传送控制信道信息的方法，包括发送具有包含分配控制信道的时间 - 频率资源区域和多个导频元素的超帧，其中至少一些与分配控制信道相关联，以及 在超帧的配置信息控制信道中指示与分配控制信道相关联的导频元素的特性。
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9.发明授权Method and apparatus for determining an appropriate link path in a multi-hop communication system 有权用于在多跳通信系统中确定适当链路路径的方法和装置公开(公告)号：US07873338B2
公开(公告)日：2011-01-18
申请号：US11874605
申请日：2007-10-18
IPC分类号： H04W88/02
CPC分类号： H04W72/085 , H04B7/2606 , H04W16/26 , H04W84/047
摘要： A determination of link quality (CSR) is made from the subscriber station to a relay station. A determination of link quality (CRB) is made from the relay station to the base station, and a determination of link quality (CSB) is made from the subscriber station to the base station. A quality of a first link path from the subscriber station to the base station that passes through the relay station is determined based on at least the link qualities (Csr, Crb). A quality of a second link path from the subscriber station to the base station that does not pass through the relay station is determined based on at least the link quality (Csb). Finally, a determination is made whether to utilize the first link path or the second link path from the subscriber station to the base station based on at least the quality of the first and second link paths.
摘要翻译： 从用户站到中继站的链路质量（CSR）的确定。 从中继站到基站进行链路质量（CRB）的确定，并从用户站到基站进行链路质量（CSB）的确定。 至少基于链路质量（Csr，Crb）确定从用户站到通过中继站的基站的第一链路路径的质量。 至少基于链路质量（Csb）来确定从用户站到基站不通过中继站的第二链路路径的质量。 最后，基于至少第一和第二链路路径的质量，确定是否利用从用户站到基站的第一链路路径或第二链路路径。
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10.发明授权Method and apparatus for selecting a communication data rate between mobile and base stations 有权用于在移动台和基站之间选择通信数据速率的方法和装置公开(公告)号：US06253063B1
公开(公告)日：2001-06-26
申请号：US09490606
申请日：2000-01-25
IPC分类号： H04B100
CPC分类号： H04W28/22 , H04L1/0002 , H04L1/0025 , H04W16/14
摘要： A mobile station (110) selects an initial data rate for communication between base station (107) and mobile station (110). Mobile station (110) communicates the selected initial data rate to base station (107) through uplink (112). Base station (107) determines a difference level of interference condition experienced by mobile station (107) between a time when the initial data rate was selected by mobile station (110) and a time when base station (107) prepares to communicate to mobile station (110). Base station (107) selects a final data rate for transmission from base station (107) to mobile station (110) based on the determined difference level of interference condition. As such, the initial data rate may be modified to the final data rate while maximizing the down link capacity.
摘要翻译： 移动台（110）为基站（107）和移动台（110）之间的通信选择初始数据速率。 移动站（110）通过上行链路（112）将所选择的初始数据速率传送到基站（107）。 基站（107）确定移动台（110）在初始数据速率被移动台（110）选择的时间与基站（107）准备与移动台通信的时间之间的移动台（107）所经历的干扰状况的差异水平 （110）。 基站（107）基于所确定的干扰条件差异来选择用于从基站（107）到移动台（110）的传输的最终数据速率。 因此，可以将最初的数据速率修改为最终数据速率，同时最大化下行链路容量。
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