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31.发明授权Sample timing selection and frequency offset correction for U.S. digital cellular mobile receivers 失效美国数字蜂窝移动接收机的采样定时选择和频偏校正
公开(公告)号：US5343498A
公开(公告)日：1994-08-30
申请号：US028016
申请日：1993-03-08
CPC分类号： H04L7/0062 , H04L7/042
摘要： A Time Division Multiple Access (TDMA) radio system achieves synchronization by performing a two-step synchronization. A simplified frame/slot synchronization is followed by a symbol synchronization of higher accuracy. This symbol timing is passed to a frequency offset unit which determines the amount of frequency drift between the transmitter and receiver and compensates for the frequency drift. This results in improved receiver performance for the TDMA digital radio system.
摘要翻译： 时分多址（TDMA）无线电系统通过执行两步同步来实现同步。 简化的帧/时隙同步之后是更高精度的符号同步。 该符号定时被传递到频率偏移单元，其确定发射机和接收机之间的频率漂移量并补偿频率漂移。 这导致TDMA数字无线电系统的接收机性能得到改善。
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32.发明授权Tangental type differential detector for pulse shaped PI/4 shifted differentially encoded quadrature phase shift keying 失效用于脉冲形PI / 4偏移差分编码正交相移键控的Tangental型差分检测器
公开(公告)号：US5283815A
公开(公告)日：1994-02-01
申请号：US703637
申请日：1991-05-21
IPC分类号： H04L27/233 , H04L27/22
CPC分类号： H04L27/2338
摘要： A digital radio receiver for synchronization of radiowave transmissions for digital and analog FM signals in TDMA systems such as cellular telephones uses a tangent type differential detector that minimizes the bit error rate. The differential detector employs an A/D converter circuit that samples a received signal, a sorter circuit that selects a predetermined number of samples to be used in the decoding, a sample and phase adjustment circuit that allows for a carrier phase adjustment and sample timing adjustment, a divider circuit that eliminates the need for a conventional limiter by causing a ratio of amplitudes to be processed instead of absolute signal amplitudes, an inverse tangent circuit creates a decoded phase angle from the ratio, a delay circuit and a summer circuit that create a differential signal, a modulo-2.pi. correction circuit that corrects for wrap-around errors about the real axis, and a four-phase decoder circuit to decode the signal into a pair of bits. An adjustment circuit minimizes phase error between a reference sequence of symbols and the decoded symbols by simultaneously adjusting the sample timing and carrier phase adjustments. The differential detector can be modified to decode conventional analog FM radio broadcasts by processing more samples per symbol, deactivating the adjustment circuit, and the SPA circuit, and bypassing the four-phase decoder.
摘要翻译： 用于在诸如蜂窝电话的TDMA系统中用于数字和模拟FM信号的无线电波传输的同步的数字无线电接收机使用使误码率最小化的切线型差分检测器。 差分检测器采用对接收信号进行采样的A / D转换电路，选择要在解码中使用的预定数目的样本的分选器电路，允许进行载波相位调整和采样定时调整的采样和相位调整电路 一个除法器电路，通过使一个幅度的比值代替绝对信号幅度来消除对常规限制器的需要，反正切电路根据该比例产生解码的相位角，延迟电路和产生一个 差分信号，修正关于实轴的环绕误差的模2（pi）校正电路，以及用于将信号解码成一对位的四相解码器电路。 调整电路通过同时调整采样定时和载波相位调整来最小化参考符号序列和解码符号之间的相位误差。 差分检测器可以通过处理每个符号的更多采样，去激活调节电路和SPA电路以及绕过四相解码器来修改以解码传统的模拟FM无线电广播。
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33.发明授权Order recursive lattice decision feedback equalization for digital cellular radio 失效为数字蜂窝无线电订单递归晶格决策反馈均衡
公开(公告)号：US5249205A
公开(公告)日：1993-09-28
申请号：US753579
申请日：1991-09-03
CPC分类号： H04L25/03057 , H03K5/159
摘要： A received time division multiple access (TDMA) signal having a time slot comprised of a plurality of symbols including at least one sequence of synchronizing symbols and a plurality of data symbols is demodulated by adaptively filtering the received signal to minimize inter-symbol interference due to an effect of channel signal propagation delay. The adaptive filtering step is performed by processing the received signal with a multi-stage lattice decision feedback equalizer having (M=N.sub.1 -N.sub.2) stages followed by (N.sub.2 -1) two-dimensional stages. A metric is next formed for each of the stages in accordance with a predetermined mathematical relationship between the output signals of each of two stages. A plurality of the formed metrics are next accumulated over a plurality of time slots. A number of stages are then recursively determined for the lattice decision feedback equalizer for use during the next time slot by comparing, to a threshold value, the difference between the values of two accumulated metrics.
摘要翻译： 通过对接收到的信号进行自适应滤波来解调具有由包括至少一个同步符号序列和多个数据符号的多个符号组成的时隙的接收到的时分多址（TDMA）信号，以最小化由于 通道信号传播延迟的影响。 通过用具有（M = N1-N2）级和（N2-1）二维级的多级格子判决反馈均衡器处理接收信号来执行自适应滤波步骤。 根据两级的每一级的输出信号之间的预定的数学关系，接下来针对每个级形成度量。 下面在多个时隙中累积多个形成的度量。 然后递归地确定多个阶段，以便在下一个时隙期间通过将两个累积度量的值之间的差值与阈值进行比较来使用。
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公开(公告)号：US07241179B2
公开(公告)日：2007-07-10
申请号：US10702260
申请日：2003-11-05
申请人： Sandeep Chennakeshu
发明人： Sandeep Chennakeshu
IPC分类号： H01R24/04
CPC分类号： H01R24/58 , H01R13/35 , H01R27/00 , H01R2103/00 , H01R2105/00
摘要： A universal four-contact plug and jack assembly permits interconnection of microphone and stereo audio signals between an audio peripheral incorporating the four-contact plug and an audio device that includes the four-contact jack. Dimensionally, the interconnecting segments of the four-contact plug are, in terms of overall length, consistent with standard three-contact audio plugs which allows the four-contact plug to be plugged into a three-contact jack intended for use with conventional three-contact audio plugs. Similarly, the four-contact jack has three of its contacts positioned as a conventional three-contact jack but with a fourth contact position to interconnect with the additional contact of four-contact plugs. With this configuration, an audio device including the four-contact plug is compatible with audio peripherals including stereo headsets, monaural headsets with microphones, and others.
摘要翻译： 通用四触点插头和插座组件允许在包含四触点插头的音频外围设备和包括四接点插孔的音频设备之间互连麦克风和立体声音频信号。 在尺寸上，四触点插头的互连部分在整体长度方面与标准的三触点音频插头一致，这允许将四触点插头插入用于与传统三接头插头一起使用的三接点插座中， 联系音频插头。 类似地，四触点插座的三个触点定位为传统的三触点插座，但具有第四接触位置以与四触点插头的附加触点互连。 通过这种配置，包括四触点插头的音频设备与包括立体声耳机，具有麦克风的单声道耳机等音频外围设备兼容。
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公开(公告)号：US06975582B1
公开(公告)日：2005-12-13
申请号：US09261209
申请日：1999-03-03
CPC分类号： H04B7/18563 , H04W88/06
摘要： A method and apparatus of communicating information using Time Division Multiple Access and adaptive transmission and reception are disclosed. Signal bursts are transmitted from TDMA transmitters to a TDMA receiver wherein the transmitter codes the information and transmits coded information to the receiver using at least one of two timeslots of a plurality of timeslots in a repetitive TDMA frame period. Both of the two timeslots are received whether or not the transmitter has transmitted using one or two timeslots and the received signals are classified as intended and non-intended. Successively received signals classified as intended are then assembled into a block for decoding to reproduce the information.
摘要翻译： 公开了使用时分多址和自适应发送和接收来传送信息的方法和装置。 信号突发从TDMA发射机发送到TDMA接收机，其中发射机对信息进行编码，并使用重复的TDMA帧周期中的多个时隙的两个时隙中的至少一个时隙向接收机发送编码信息。 无论发射机是使用一个或两个时隙发射，并且接收到的信号被分类为预期和非目的，两个时隙都被接收。 然后将分类为预期的随后接收信号组装成用于解码的块以再现信息。
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36.发明申请Methods, devices, and systems for displaying information from a remote electronic device 审中-公开用于从远程电子设备显示信息的方法，设备和系统公开(公告)号：US20050174488A1
公开(公告)日：2005-08-11
申请号：US10655422
申请日：2003-09-04
申请人： Sandeep Chennakeshu
发明人： Sandeep Chennakeshu
CPC分类号： H04M1/7253 , H04M1/72544 , H04M1/72552 , H04M2250/02 , H04N5/4403 , H04N5/44582 , H04N21/4126 , H04N21/43637 , H04N2005/4426
摘要： Information from a handheld electronic device can be shown on a video screen that is remote from the electronic device. More particularly, information can be provided within a handheld electronic device, and communicated from the handheld electronic device to a receiver over a wireless coupling. A video signal is generated responsive to the information communicated over the wireless coupling, and the video signal is provided for display on the video screen. More particularly, the information can be communicated over the wireless coupling according to a Bluetooth protocol. Related methods, systems, and devices are discussed.
摘要翻译： 来自手持电子设备的信息可以在远离电子设备的视频屏幕上显示。 更具体地，可以在手持电子设备内提供信息，并且通过无线耦合从手持电子设备传送到接收器。 响应于通过无线耦合传送的信息产生视频信号，并且提供视频信号以在视频屏幕上显示。 更具体地，可以通过根据蓝牙协议的无线耦合来传送信息。 讨论相关方法，系统和设备。
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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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38.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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40.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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