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1.发明授权System and method for coding in a telecommunications environment using orthogonal and near-orthogonal codes 失效在电信环境中使用正交和近正交码进行编码的系统和方法公开(公告)号：US06483828B1
公开(公告)日：2002-11-19
申请号：US09248506
申请日：1999-02-10
申请人： Kumar Balachandran , Rajaram Ramesh , Havish Koorapaty , Eric Wang , Sandeep Chennakeshu , Amer Hassan
发明人： Kumar Balachandran , Rajaram Ramesh , Havish Koorapaty , Eric Wang , Sandeep Chennakeshu , Amer Hassan
IPC分类号： H04B7216
CPC分类号： H04J13/004 , H04J13/0077 , H04J13/18
摘要： A system and method for permitting variable information rates and improved error performance using orthogonal or near-orthogonal codes is disclosed. This is achieved by simultaneously transmitting two or more Walsh code words from a given orthogonal code set and/or by transmitting multiple shorter orthogonal codewords sequentially such that their combined length equals the original codeword. It should be emphasized that the present invention can be used with any orthogonal or near-orthogonal code set.
摘要翻译： 公开了一种使用正交或近正交码来允许可变信息速率和改进的误差性能的系统和方法。 这是通过从给定的正交码集合同时发送两个或多个沃尔什码字和/或通过顺序地发送多个较短的正交码字来实现的，使得它们的组合长度等于原始码字。 应当强调，本发明可以与任何正交或近正交码集一起使用。
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2.发明授权Circuitry and method for improved signal reception acknowledgment in a radio communication system 失效一种用于在无线电通信系统中改善信号接收确认的电路和方法
公开(公告)号：US5933763A
公开(公告)日：1999-08-03
申请号：US764672
申请日：1996-12-11
IPC分类号： H04B7/15 , H04B7/185 , H04L1/00 , H04L1/16 , H04L1/18 , H04W68/00 , H04W68/02 , H04Q7/08 , H04Q7/10 , H04Q7/12
CPC分类号： H04W68/02 , H04B7/18532 , H04L1/0009 , H04L1/1692 , H04L1/1867
摘要： A method and associated circuitry for initiating communication between a network station and a user terminal of a radiotelephonic communication system, such as a satellite-cellular communication system. When communication is to be initiated, a paging signal is transmitted by a network station to the user terminal. When the user terminal detects the paging signal, an acknowledgment signal is generated by the user terminal and encoded to increase the margin of the acknowledgment signal. Upon reception, the acknowledgment signal is correlated using a multiplicity of correlators. An increased margin acknowledgment signal acknowledging reception of the paging signal is transmitted to facilitate communication of the acknowledgment signal back to the network station.
摘要翻译： 一种用于发起无线电通信系统（诸如卫星蜂窝通信系统）的网络站和用户终端之间的通信的方法和相关电路。 当要发起通信时，网络站向用户终端发送寻呼信号。 当用户终端检测到寻呼信号时，用户终端产生一个确认信号并进行编码以增加确认信号的余量。 在接收时，确认信号使用多个相关器进行相关。 发送确认寻呼信号的接收的增加的余量确认信号以促进确认信号的通信回到网络站。
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公开(公告)号：US5838267A
公开(公告)日：1998-11-17
申请号：US728158
申请日：1996-10-09
CPC分类号： H04L1/0057 , H03M13/00 , H03M13/2927 , H03M13/293 , H03M13/2942 , H03M13/3769 , H04L1/06 , H03M13/1505 , H03M13/6306 , H04L1/0071
摘要： A method for encoding and decoding the digital information sequence uses a combination of two block codes to simultaneously correct and detect errors. The information sequence is encoded by a first stage of the encoder to produce an information code word including an information vector and a primary redundancy vector. The primary redundancy vector is encoded in a second stage of the encoder to obtain a redundancy code word. The information code word and redundancy code word are interleaved and transmitted to the receiver. At the receiver, the information code word and redundancy code word are decoded in a first stage of the decoder to obtain a first estimate of the information code word. The first estimate of the information code word is decoded in the second stage of the decoder to produce a second estimate of the information code word. The distance between the first and second estimates of the information code word is evaluated. If the distance is more than one, the received code word is erased. In another embodiment, the information sequence is repeated at the receiver. Each repetition includes a parity check resulting from the same code or from different codes. The received information vectors are selectively combined and then individually decoded using the individual parity vectors to generate multiple estimates of the information sequence. The estimates are then combined using hard or soft combining techniques.
摘要翻译： 用于对数字信息序列进行编码和解码的方法使用两个块码的组合来同时校正和检测错误。 信息序列由编码器的第一级编码，以产生包括信息向量和主冗余向量的信息码字。 主冗余矢量被编码在编码器的第二级以获得冗余码字。 信息码字和冗余码字被交织并发送到接收机。 在接收机处，信息码字和冗余码字在解码器的第一级解码，以获得信息码字的第一估计。 在解码器的第二级解码信息码字的第一估计，以产生信息码字的第二估计。 评估信息码字的第一和第二估计之间的距离。 如果距离大于1，则接收到的代码字被擦除。 在另一个实施例中，在接收器处重复信息序列。 每个重复都包括由相同代码或不同代码产生的奇偶校验。 选择性地组合所接收的信息向量，然后使用各个奇偶校验向量单独解码以生成信息序列的多个估计。 然后使用硬或软组合技术组合估计值。
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4.发明授权Circuitry and method for initiating communication between communication stations of a radio communication system 失效用于发起无线电通信系统的通信站之间的通信的电路和方法
公开(公告)号：US5918174A
公开(公告)日：1999-06-29
申请号：US626182
申请日：1996-03-29
CPC分类号： H04B7/18558 , H04W68/00 , H04W68/02 , H04W88/185
摘要： A method and associated circuitry for initiating communication between a network station and a user terminal of a radiotelephonic communication system, such as a satellite-cellular communication system. When communication is to be initiated, a paging signal is transmitted by a network station to the user terminal. When the user terminal detects the paging signal, an acknowledgment signal is generated by the user terminal and encoded to increase the margin of the acknowledgment signal. An increased-margin acknowledgment signal acknowledging reception of the paging signal is transmitted to facilitate communication of the acknowledgment signal back to the network station.
摘要翻译： 一种用于发起无线电通信系统（诸如卫星蜂窝通信系统）的网络站和用户终端之间的通信的方法和相关电路。 当要发起通信时，网络站向用户终端发送寻呼信号。 当用户终端检测到寻呼信号时，用户终端产生一个确认信号并进行编码以增加确认信号的余量。 发送确认寻呼信号的接收的增加的裕度确认信号以促进确认信号的通信回到网络站。
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5.发明授权Measurement techniques for diversity and inter-frequency mobile assisted handoff (MAHO) 失效用于分集和频间移动辅助切换（MAHO）的测量技术公开(公告)号：US06212368B1
公开(公告)日：2001-04-03
申请号：US09085528
申请日：1998-05-27
IPC分类号： H04B1700
CPC分类号： H04W88/02 , H04B7/0808 , H04W24/10 , H04W36/06
摘要： Diversity and inter-frequency mobile-assisted handoff (MAHO) are achieved under continuous reception cellular access methods by using strategic timing and switching optimizations. Strategic timing is achieved by avoiding the non-reception of power control bits. For example, the mobile terminal can make measurements for diversity in the last eight bits of a sub-frame of an IS-95 downlink transmission. Switching is optimized, for example, by storing rake taps for a first antenna prior to switching to a second antenna so that the rake tap positions can be restored upon returning to the first antenna. With these and other disclosed measurement techniques, the benefits of diversity and inter-frequency MAHO can be achieved in continuous reception cellular systems.
摘要翻译： 通过使用战略定时和切换优化，在连续接收蜂窝接入方式下实现分集和频间移动辅助切换（MAHO）。 通过避免电源控制位的不接收来实现战略时序。 例如，移动终端可以对IS-95下行链路传输的子帧的最后8位中的分集进行测量。 优化切换，例如，在切换到第二天线之前，通过存储用于第一天线的雷击抽头，使得在返回到第一天线时可以恢复前叉抽头位置。 利用这些和其他公开的测量技术，可以在连续接收蜂窝系统中实现分集和频间MAHO的益处。
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公开(公告)号：US6085103A
公开(公告)日：2000-07-04
申请号：US802670
申请日：1997-02-19
CPC分类号： H04B7/005
摘要： A fading compensation apparatus and method are provided in which blocks of the analog AM signal (e.g., voice) are time-compressed at a transmitter. Gaps in the time-compressed signal are filled with pilot symbols (or similar complex waveforms) having known characteristics, such as predetermined amplitudes. The time-compressed analog AM signal (e.g., SSB or VSB) is transmitted over the fading channel. At an analog AM receiver, an estimate of the fading that occurred in the transmission channel is made by observing the amplitude of the received pilot symbols at discrete points in time, and interpolating to determine the amount of fading that occurred across the total transmitted signal. A fading compensator compares the received faded time-compressed signal with the interpolation results, and adjusts the amplitude and phase of the received signal accordingly to compensate for the fading that occurred in the transmission channel. The compensated analog AM signal is time expanded and output to a user.
摘要翻译： 提供了一种衰落补偿装置和方法，其中模拟AM信号（例如，语音）的块在发射机处被时间压缩。 用时间压缩信号的间隙填充具有已知特性（例如预定幅度）的导频符号（或类似的复杂波形）。 时间压缩的模拟AM信号（例如，SSB或VSB）在衰落信道上传输。 在模拟AM接收机处，通过在离散时间点观察接收到的导频符号的幅度来进行在传输信道中发生的衰落的估计，并进行内插以确定跨总传输信号发生的衰落量。 衰落补偿器将接收到的衰落时间压缩信号与插值结果进行比较，并相应地调整接收信号的幅度和相位，以补偿在传输信道中发生的衰落。 经补偿的模拟AM信号被时间扩展并输出给用户。
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公开(公告)号：US6005887A
公开(公告)日：1999-12-21
申请号：US748755
申请日：1996-11-14
摘要： The disclosure presents a number of reduced complexity architectures for despreading direct sequence spread spectrum communications signals. In a first despreading architecture for a sequence removal unit, received chip-spaced complex samples are negated in accordance with the processed phase of a complex spreading sequence. Furthermore, the in-phase and quadrature phase sample values are switched for each other in accordance with the processed phase. In a second despreading architecture, in a sequence removal unit, received chip-spaced complex samples are processed in the logarithmic domain, with the phase of the complex spreading sequence added to the detected phase, and the resulting complex signal then converted back to Cartesian coordinates. In a third despreading architecture for a correlator, sequence removal and correlation are performed in the logarithmic domain with the amplitudes and phases for the resulting complex signal arithmetically averaged and then converted back to Cartesian coordinates. architecture also for a correlator, sequence removal and correlation are performed in the logarithmic domain using circular averaging. In a fifth despreading architecture also for a correlator, wherein multiple component sequences are combined together to form an overall sequence, and wherein one of the multiple component sequences is shared by all channels, a common sequence removal is provided for removal of the shared sequence from all channels. The resulting signals are then sent to a plurality of individual correlators for removal of channel specific sequences.
摘要翻译： 本公开提出了用于解扩直接序列扩频通信信号的许多降低的复杂度架构。 在用于序列去除单元的第一解扩架构中，根据复扩展序列的处理相位，接收的码片间隔复数样本被否定。 此外，同相和正交相位采样值根据处理相位彼此切换。 在第二解扩架构中，在序列去除单元中，在对数域中处理接收的码片间隔复数样本，其中复扩展序列的相位被加到检测相位，并且所得到的复信号然后转换回笛卡尔坐标 。 在用于相关器的第三解扩架构中，在对数域中执行序列去除和相关，其中所得复数信号的幅度和相位被算术平均，然后转换回笛卡尔坐标。 用于相关器的架构，使用循环平均在对数域中执行序列去除和相关。 在用于相关器的第五解扩架构中，其中将多个分量序列组合在一起以形成整个序列，并且其中所述多个分量序列之一由所有信道共享，提供共同的序列去除以从 所有频道 然后将所得到的信号发送到多个单独的相关器，以去除信道特定序列。
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8.发明授权Method and apparatus for enabling mobile-to-mobile calls in a communication system 失效用于在通信系统中实现移动电话到移动电话的方法和装置
公开(公告)号：US5809141A
公开(公告)日：1998-09-15
申请号：US681916
申请日：1996-07-30
CPC分类号： H04B7/18532 , H04B7/18558 , H04B7/18565
摘要： A communication system is disclosed which reduces loop delay when a first wireless phone calls a second wireless phone wherein the first and second phones are served by the same relay station. The communication system includes a relay station for communicating with the first and second wireless phones. A transponder located in the relay station relays signals received from one mobile station on a first frequency band to another mobile station on a second frequency band. In addition, the transponder sends the received signals to a controller which controls the operation of the transponder using control information.
摘要翻译： 公开了一种通信系统，其在第一无线电话呼叫第二无线电话时减少环路延迟，其中第一和第二电话由相同的中继站服务。 通信系统包括用于与第一和第二无线电话进行通信的中继站。 位于中继站的应答器将在第一频带上从一个移动台接收的信号中继到第二频带上的另一个移动台。 此外，应答器将接收的信号发送到使用控制信息控制应答器的操作的控制器。
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公开(公告)号：US6035178A
公开(公告)日：2000-03-07
申请号：US647188
申请日：1996-05-09
CPC分类号： H04B7/18578
摘要： A communication system provides efficient satellite communication in rural, remote, or sparsely populated areas, or in areas lacking a conventional telephone infrastructure, or in special purpose uses such as airport coverage. Subscribers in such areas communicate with the satellite via a simple, highly modular entry node located in a local area to be served. Subscriber units provide subscribers with access to the system. The subscriber units are connected to the entry node via local access loops provided by point-to-point wireless links between the subscriber units and the entry node. The entry node internally switches local traffic among subscribers and connects traffic to outside circuits, via wireless links with the satellite, as appropriate. The outside circuits are provided by the cooperative working of the satellite, an entry-node controller, and an earth station. The wireless links between the satellite and the entry node and the local access loops may operate at the same or different frequencies. If they operate at different frequencies, a frequency translator in the entry node controller matches the different frequencies. A subscriber unit may be used to provide the subscribers with access to the system such that speech compression and decompression takes place in the subscriber unit itself to avoid the effects of tandem coder/decoders.
摘要翻译： 通信系统在农村，偏远或人烟稀少的地区或缺乏常规电话基础设施的地区或机场覆盖等特殊用途中提供有效的卫星通信。 这些区域中的用户通过位于待服务的局域的简单，高度模块化的入口节点与卫星通信。 用户单元向订户提供对系统的访问。 用户单元通过由用户单元和入口节点之间的点对点无线链路提供的本地接入环路连接到入口节点。 入口节点内部切换用户之间的本地流量，并根据需要通过与卫星的无线链路将流量连接到外部电路。 外部电路由卫星的协同工作，入口节点控制器和地球站提供。 卫星与入口节点和本地接入环路之间的无线链路可以以相同或不同的频率工作。 如果它们以不同的频率操作，则入口节点控制器中的频率转换器匹配不同的频率。 用户单元可以用于向用户提供对系统的访问，使得在用户单元本身中发生语音压缩和解压缩，以避免串联编码器/解码器的影响。
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10.发明授权Methods and apparatus for canceling adjacent channel signals in digital communications systems 失效用于消除数字通信系统中相邻信道信号的方法和装置
公开(公告)号：US6137843A
公开(公告)日：2000-10-24
申请号：US901693
申请日：1997-07-28
IPC分类号： H04J1/00 , H01Q1/24 , H01Q21/08 , H01Q21/28 , H04B1/10 , H04B1/12 , H04B7/005 , H04B7/08 , H04B7/10 , H04B7/185 , H04B7/195 , H04B7/204 , H04B7/212 , H04B7/26 , H04J1/12 , H04J3/00 , H04L1/00 , H04L1/06 , H04L25/02 , H04L25/03 , H04W16/02 , H04W16/14 , H04W74/08 , H04W84/02 , H04W84/04 , H04W84/06 , H04L25/08
CPC分类号： H01Q1/246 , H01Q21/08 , H01Q21/28 , H04B1/126 , H04B7/0851 , H04B7/10 , H04B7/18513 , H04B7/18515 , H04B7/18532 , H04B7/18567 , H04B7/2041 , H04L1/06 , H04L25/0204 , H04L25/021 , H04L25/03331 , H04W16/02 , H04W84/025 , H04B7/0837 , H04L1/007 , H04L25/03203 , H04L25/0328 , H04L25/03299 , H04W16/14 , H04W74/08 , H04W84/042 , H04W84/06
摘要： A multi-signal cancelling demodulator in which signals of interest are demodulated using information obtained during demodulation of adjacent signals. By utilizing detected information in an across-channel fashion, exemplary cancelling demodulators provide superior adjacent channel interference rejection. The cancelling demodulation is conducted in either serial or parallel fashion. In exemplary parallel demodulation embodiments, two channels are demodulated simultaneously in iterative fashion. Detected information obtained at each step in the iterative process is used as a priori information for demodulation in a following step. In exemplary serial demodulation embodiments, the stronger of two received signals is demodulated, and the resulting detected information is used as a priori information for demodulation of the weaker of the two received signals. For both the serial and parallel demodulation embodiments, novel techniques are disclosed for transforming symbols detected in one frequency band to corresponding symbols in adjacent frequency bands. Such inter-channel transformations are also applied in the context of channel estimation. In an exemplary channel estimator, multiple channel parameter estimates for a particular frequency channel are provided based on a received baseband signal corresponding to that frequency channel. Since inter-channel information is used in providing the channel parameter estimates, the exemplary channel estimator provides superior adjacent channel interference rejection.
摘要翻译： 一种多信号消除解调器，其中使用在相邻信号的解调期间获得的信息来解调感兴趣的信号。 通过利用跨信道方式的检测信息，示例性的消除解调器提供了优越的相邻信道干扰抑制。 取消解调以串行或并行方式进行。 在示例性并行解调实施例中，两个信道以迭代方式同时被解调。 在迭代处理中的每个步骤获得的检测信息被用作以下步骤中的解调的先验信息。 在示例性串行解调实施例中，两个接收信号中的较强者被解调，并且所得到的检测信息被用作用于解调两个接收信号较弱的先验信息。 对于串行和并行解调实施例，公开了用于将在一个频带中检测的符号变换为相邻频带中的相应符号的新颖技术。 这样的信道间变换也在信道估计的上下文中应用。 在示例性信道估计器中，基于对应于该频率信道的接收基带信号来提供针对特定频率信道的多信道参数估计。 由于在提供信道参数估计中使用信道间信息，所以示例性信道估计器提供了优越的相邻信道干扰抑制。
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