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公开(公告)号：US06768913B1
公开(公告)日：2004-07-27
申请号：US09583535
申请日：2000-06-01
IPC分类号： H04B138
CPC分类号： H04W16/28 , H04B7/18532
摘要： A radio communication system includes a base station having a directional antenna for generating a plurality of beams. A first set of the beams is used to receive signals which are decoded at the base station. A second set of the beams is used for interrogating a cell to identify beams which should be added to the first set of beams (for example, in response to mobile terminals entering the cell). In one embodiment, the second set of beams comprises a plurality of searcher beams produced by a fixed-beam phased array antenna. In a second embodiment, the second set of beams comprises a single searcher beam which is scanned through the cell by an adaptive phased array antenna. The radio communication system can be used to communicate with indoor mobile terminals through a plurality of radio heads, and also can be used to communicate with orbiting satellites.
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32.发明授权Method and apparatus for performing beam searching in a radio communication system 失效在无线电通信系统中执行波束搜索的方法和装置公开(公告)号：US06694154B1
公开(公告)日：2004-02-17
申请号：US08971341
申请日：1997-11-17
IPC分类号： H04B138
CPC分类号： H04W16/28 , H04B7/18532
摘要： A radio communication system includes a base station having a directional antenna for generating a plurality of beams. A first set of the beams is used to receive signals which are decoded at the base station. A second set of the beams is used for interrogating a cell to identify beams which should be added to the first set of beams (for example, in response to mobile terminals entering the cell). In one embodiment, the second set of beams comprises a plurality of searcher beams produced by a fixed-beam phased array antenna. In a second embodiment, the second set of beams comprises a single searcher beam which is scanned through the cell by an adaptive phased array antenna. The radio communication system can be used to communicate with indoor mobile terminals through a plurality of radio heads, and also can be used to communicate with orbiting satellites.
摘要翻译： 无线电通信系统包括具有用于产生多个波束的定向天线的基站。 第一组光束用于接收在基站处解码的信号。 第二组波束用于询问小区以识别应该被添加到第一组波束（例如，响应于进入小区的移动终端）的波束。 在一个实施例中，第二组波束包括由固定波束相控阵天线产生的多个搜索器波束。 在第二实施例中，第二组波束包括通过自适应相控阵列天线扫描小区的单个搜索器波束。 无线电通信系统可以用于通过多个无线电头与室内移动终端通信，并且还可以用于与轨道卫星通信。
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公开(公告)号：US06580930B1
公开(公告)日：2003-06-17
申请号：US09292261
申请日：1999-04-15
IPC分类号： H04B726
CPC分类号： H04L1/208 , H04L1/0001 , H04L1/20
摘要： A detector selector and method are provided for selecting among detectors, where a less complex detector detects known symbols in a received signal, and a bit error rate for the known symbols is used to determine whether the less complex detection method is sufficient. If the less complex detector is not sufficient, a more complex detector is used to detect the signal. Additionally, assured symbols are used as known symbols to increase the accuracy for the determination of whether the less complex detector is sufficient.
摘要翻译： 提供检测器选择器和方法用于在检测器之间进行选择，其中较不复杂的检测器检测接收信号中的已知符号，并且使用已知符号的误码率来确定较不复杂的检测方法是否足够。 如果较不复杂的检测器不足，则使用更复杂的检测器来检测信号。 此外，使用有保证符号作为已知符号来增加确定较不复杂的检测器是否足够的准确性。
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公开(公告)号：US06493322B1
公开(公告)日：2002-12-10
申请号：US08840268
申请日：1997-04-14
IPC分类号： H04J314
CPC分类号： H04B7/18534
摘要： A diversity scheme for allowing a transmitter/receiver, such as a mobile unit in a mobile telecommunications system, to exchange communication signals with more than one control station, such as a base station or satellite. According to an exemplary embodiment of the diversity scheme, the mobile unit scans for the control channel of a second satellite during idle time slots while communicating with a first satellite during active time slots. Once the mobile unit detects a control channel from a second satellite, the mobile unit stores synchronization information and establishes a communication link with the second satellite if shadowing or other severe fading causes signal quality over a communication link established with a first satellite to fall below a threshold level. The diversity scheme also allows the mobile unit to communicate simultaneously with two satellites, using alternate TDMA frames.
摘要翻译： 用于允许诸如移动电信系统中的移动单元的发射机/接收机与诸如基站或卫星的多于一个控制站交换通信信号的分集方案。 根据分集方案的示例性实施例，移动单元在空闲时隙期间扫描第二卫星的控制信道，同时在活动时隙期间与第一卫星通信。 一旦移动单元检测到来自第二卫星的控制信道，则移动单元存储同步信息并与第二卫星建立通信链路，如果阴影或其他严重衰落导致通过与第一卫星建立的通信链路的信号质量降至低于 门限等级。 分集方案还允许移动单元使用备用TDMA帧同时与两颗卫星通信。
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35.发明授权公开(公告)号：US06335954B1
公开(公告)日：2002-01-01
申请号：US08773560
申请日：1996-12-27
IPC分类号： H04L700
CPC分类号： H04B7/0845
摘要： An apparatus for joint synchronization of digital communication signals from multiple receive channels comprises a control unit, a metric computer, and a decimator. The control unit generates test sampling phase vectors for use in decimating the signals. The output of the decimator is used by the metric computer to form a metric predictive of the performance of a demodulator. The metric is used by the control unit to select an optimal sampling phase vector. In one embodiment, the metric computer calculates the signal to impairment plus noise ratio (SINR) at the output of the demodulator based on the decimated signals. In one embodiment, a data correlation estimator generates a data correlation estimate for use in calculating output SINR. In another embodiment, the apparatus includes a select unit and a metric computer. The select unit may include a control unit and a decimator. The metric computer also includes at least one decimator. Test sampling phase vectors are provided to the metric computer along with the input signals. The metric computer generates a metric predictive of the performance of the interference canceling processor. The control unit selects a test sampling phase vector that optimizes performance of the interference canceling processor. The decimator decimates the input signals according to the sampling phases of the selected sampling phase vector. A method of joint synchronization of signals from multiple receive channels is also disclosed.
摘要翻译： 用于来自多个接收信道的数字通信信号的联合同步的装置包括控制单元，度量计算机和抽取器。 控制单元生成用于抽取信号的测试采样相位矢量。 抽取器的输出由度量计算机使用以形成对解调器的性能的度量。 控制单元使用度量来选择最佳采样相位矢量。 在一个实施例中，度量计算机基于抽取的信号计算在解调器的输出处的损害加噪声比（SINR）的信号。 在一个实施例中，数据相关估计器产生用于计算输出SINR的数据相关估计。在另一实施例中，该装置包括选择单元和度量计算机。 选择单元可以包括控制单元和抽取器。 公制计算机还包括至少一个抽取器。 测量采样相位矢量与输入信号一起提供给公制计算机。 度量计算机产生预测干扰消除处理器的性能的度量。 控制单元选择优化干扰消除处理器的性能的测试采样相位矢量。 抽取器根据所选采样相位矢量的采样相位对输入信号进行抽取。还公开了来自多个接收信道的信号的联合同步的方法。
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公开(公告)号：US5991331A
公开(公告)日：1999-11-23
申请号：US978911
申请日：1997-11-26
IPC分类号： H04B1/12 , H04B1/713 , H04B1/715 , H04B7/04 , H04B7/06 , H04B7/08 , H04B7/12 , H04J3/00 , H04K1/00
CPC分类号： H04B7/0894 , H04B1/713 , H04B1/715 , H04B7/0671 , H04B7/084 , H04B1/126
摘要： A delay spread is created in a digital radio signal to reduce the coherence bandwidth and facilitate frequency hopping to reduce the effect of fading losses within an enclosed propagation environment. The delay spread is introduced into the signal in several ways. One technique disclosed employs a transmitter with two separate antennas one of which transmits the digital signal and the other of which transmits the same signal after a phase delay has been introduced into the signal. The carrier frequency of the signals is hopped between at least two frequencies and the receiver processes the resulting signals. In another embodiment, a single transmit antenna is used but the signal is received by two different antennas with the output signal from one of those antennas being phase delayed before combining it with the other prior to processing by the receiver circuitry. Phase delay is also introduced at baseband into the signals to be transmitted by rotating the I and Q components of the waveforms before modulation.
摘要翻译： 在数字无线电信号中产生延迟扩展以减少相干带宽并促进跳频以减少封闭传播环境内的衰落损耗的影响。 延迟传播以几种方式被引入到信号中。 所公开的一种技术采用具有两个单独天线的发射机，其中一个发射数字信号，而另一个天线在相位延迟被引入信号之后发射相同的信号。 信号的载波频率在至少两个频率之间跳跃，并且接收机处理所得到的信号。 在另一个实施例中，使用单个发射天线，但是信号由两个不同的天线接收，其中一个天线的输出信号在被接收机电路处理之前与另一天线组合之前被相位延迟。 在调制之前，通过旋转波形的I和Q分量，在基带处将相位延迟也引入要发送的信号。
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37.发明授权Method and apparatus for bidirectional demodulation of digitally modulated signals 失效用于数字调制信号的双向解调的方法和装置
公开(公告)号：US5909465A
公开(公告)日：1999-06-01
申请号：US761003
申请日：1996-12-05
申请人： Gregory Edward Bottomley , Paul Wilkinson Dent , Ravinder David Koilpillai , Sandeep Chennakeshu
发明人： Gregory Edward Bottomley , Paul Wilkinson Dent , Ravinder David Koilpillai , Sandeep Chennakeshu
CPC分类号： H04L25/03178 , H04L2025/0356
摘要： A system and method for bidirectionally demodulating data symbols transmitted through a communication channel. The method includes sequentially receiving and storing a first plurality of known data symbols, a second plurality of unknown data symbols, and a third plurality of known data symbols. Thereafter, a first block of the unknown data symbols received nearer the first plurality of known data symbols is forward-demodulated. Likewise, a second block of the unknown data symbols received nearer the third plurality of known data symbols is backward-demodulated. The forward- and backward-demodulation of the unknown data symbols determines quality values (figure-of-merits based on at least one of signal power, noise power and a combination of signal power plus noise power) indicative of demodulation qualities of the unknown data symbols that are compared to produce a best direction indication. Upon determining the best direction indication, either the forward- or backward-demodulation steps are repeated for subsequent blocks of unknown data symbols.
摘要翻译： 一种用于双向解调通过通信信道发送的数据符号的系统和方法。 该方法包括顺序地接收和存储第一多个已知数据符号，第二多个未知数据符号和第三多个已知数据符号。 此后，向第一多个已知数据符号接收的未知数据符号的第一块进行前向解调。 类似地，接收到的接近第三多个已知数据符号的未知数据符号的第二块被反向解调。 未知数据符号的前向和后向解调确定指示未知数据的解调质量的质量值（基于信号功率，噪声功率和信号功率加噪声功率的组合中的至少一个）的品质值 比较符号以产生最佳方向指示。 在确定最佳方向指示时，对于未知数据符号的后续块重复前向或后向解调步骤。
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公开(公告)号：US5905742A
公开(公告)日：1999-05-18
申请号：US579349
申请日：1995-12-27
CPC分类号： H04L1/0071 , H03M13/41 , H03M13/6502 , H04L1/0009 , H04L25/03216
摘要： A low complexity, high performance trellis decoder adapts the complexity of the trellis decoding process based on a current condition of the communications system. A trellis structure of nodes and branches is developed to decode the sequence of symbols received over a communications channel. Each set of nodes in the trellis represents the possible values of a received symbol at one time instant. Each branch defines a specific transition between nodes at different time instants, and each branch has an associated branch metric or weight. A linkage of branches between the nodes and the trellis defines a path through the trellis that represents one possible symbol sequence, and an accumulated metric/weight is generated for each possible path through the trellis. A variable number M survivor paths through the trellis is determined based on their accumulated path metric/weights. The value of the variable M depends on the current condition of the communications system. Once the value of M is adapted to the current condition, the sequence of received symbols is decoded using M survivor paths through the trellis.
摘要翻译： 低复杂度的高性能网格解码器基于通信系统的当前状况来适应网格解码过程的复杂性。 开发节点和分支的网格结构来解码通过通信信道接收的符号序列。 网格中的每组节点在一个时刻表示接收到的符号的可能值。 每个分支定义不同时刻的节点之间的特定转换，并且每个分支具有关联的分支度量或权重。 节点和网格之间的分支的链接定义了通过网格的路径，其表示一个可能的符号序列，并且通过网格为每个可能的路径生成累积的度量/权重。 根据其累积的路径度量/权重来确定通过网格的可变数M个幸存者路径。 变量M的值取决于通信系统的当前状态。 一旦M的值适合于当前条件，则使用经过网格的M个幸存路径来解码接收符号的序列。
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公开(公告)号：US5577068A
公开(公告)日：1996-11-19
申请号：US274727
申请日：1994-07-18
CPC分类号： H04B7/005 , H04L25/03184 , H04L25/03292
摘要： A radio receiver for demodulating and equalizing digital information is disclosed. The receiver receives radio signals and processes the signals to produce data samples which are then stored. Reference values that model what the receiver should receive for various transmitted symbol sequence hypotheses are also stored. The receiver equalizes the received data using the stored reference values to produce symbol detection information, and updates the reference values based on the symbol detection information.
摘要翻译： 公开了用于解调和均衡数字信息的无线电接收机。 接收机接收无线电信号并处理信号以产生然后被存储的数据样本。 对存储各种发送的符号序列假设的接收机应该接收什么的参考值也被存储。 接收机使用所存储的参考值均衡接收到的数据以产生符号检测信息，并且基于符号检测信息来更新参考值。
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公开(公告)号：US5353307A
公开(公告)日：1994-10-04
申请号：US95367
申请日：1993-07-20
CPC分类号： H04H20/67 , H04L25/03057 , H04L2025/03656
摘要： A digital simulcast transmission is automatically aligned, at a simulcast receiver (22) that simultaneously receives a plurality of RF signals from a plurality of transmitters, each of the RF signals being modulated to convey identical digitally encoded information. An equalizer (24) adaptively equalizes the plurality of received RF signals to substantially correct for a misalignment in time between the received signals. The misalignment in time is due in part to a non-simultaneous transmission of the identical digitally encoded information from the plurality of transmitters. Equalizer embodiments include a Decision Feedback Equalizer (DFE) and an equalizer based on a Maximum Likelihood Sequence Estimator (MLSE). Embodiments of the DFE are an Order Recursive Lattice-DFE and a Fast Kalman DFE.
摘要翻译： 在同时从多个发射机接收多个RF信号的同时接收机（22），数字联播传输被自动对准，每个RF信号被调制以传送相同的数字编码信息。 均衡器（24）自适应地均衡多个接收到的RF信号，以基本上校正接收信号之间的时间偏移。 在时间上的偏移部分是由于来自多个发射机的相同数字编码信息的非同时传输。 均衡器实施例包括基于最大似然序列估计器（MLSE）的判决反馈均衡器（DFE）和均衡器。 DFE的实施例是订单递归晶格-DFE和快速卡尔曼DFE。
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