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    Wireless communications with frequency band selection
    41.
    发明授权
    Wireless communications with frequency band selection 有权
    无线通信与频段选择

    公开(公告)号：US07050402B2

    公开(公告)日：2006-05-23

    申请号：US09777201

    申请日：2001-02-05

    申请人： Timothy M. Schmidl ,  Mohammed Nafie ,  Anand G. Dabak

    发明人： Timothy M. Schmidl ,  Mohammed Nafie ,  Anand G. Dabak

    IPC分类号： G01R31/08

    CPC分类号： H04L1/1664 ,  H04L1/0026 ,  H04L1/0054 ,  H04L1/006 ,  H04L1/1614 ,  H04L1/1819 ,  H04L1/1835 ,  H04L1/1874 ,  H04L1/188 ,  H04W24/00 ,  H04W24/06 ,  H04W28/04 ,  H04W28/06 ,  H04W28/22 ,  H04W48/16 ,  H04W72/02 ,  H04W84/10

    摘要： A probe, listen and select (PLS) technique can be used to select from an available frequency spectrum a frequency band whose communication quality is suitable for wireless communication at a desired rate. Probe packets can be transmitted on different frequencies (223) during a known period of time (TPLS), and frequency channel quality information can be obtained (225) from the probe packets. This quality information can then be used to select a desirable frequency band (227). The communication quality of the selected band can also be used as basis for selecting (141) from among a plurality of modulation and coding combinations that are available for use in communications operations.

    摘要翻译： 可以使用探测，收听和选择（PLS）技术来从可用频谱中选择其通信质量适合于期望速率的无线通信的频带。 探测分组可以在已知时间段（T PLS）期间在不同频率（223）上传输，并且可以从探测分组获得频道质量信息（225）。 然后可以使用该质量信息来选择期望的频带（227）。 所选频带的通信质量也可以用作从可用于通信操作的多个调制和编码组合中选择（141）的基础。

    Wireless code division multiple access communications system with channel estimation using fingers with sub-chip spacing
    43.
    发明授权
    Wireless code division multiple access communications system with channel estimation using fingers with sub-chip spacing 有权
    无线码分多址通信系统，带有子码片间距的手指信道估计

    公开(公告)号：US06856610B2

    公开(公告)日：2005-02-15

    申请号：US09792111

    申请日：2001-02-23

    申请人： Timothy M. Schmidl ,  Srinath Hosur ,  Anand G. Dabak

    发明人： Timothy M. Schmidl ,  Srinath Hosur ,  Anand G. Dabak

    IPC分类号： H04B1/711 ,  H04B1/7117 ,  H04B7/216

    CPC分类号： H04B1/711 ,  H04B1/7117

    摘要： A wireless communication network (10). The network comprises a wireless receiver (14). The receiver comprises at least one antenna (AT14) for receiving a plurality of frames in a form of a plurality of paths. Each of the plurality of frames is modulated by a plurality of chips, and chip in the plurality of chips has a like chip duration. The receiver further comprises a plurality of path resources (F1, F2), and this plurality of path resources comprises a first path resource (F1) configured to receive a first plurality of symbols from a first path in the plurality of paths and a second path resource (F2) configured to receive a second plurality of symbols from a second path in the plurality of paths. The plurality of path resources also comprises circuitry for sampling the second path at a time less than the chip duration from a time when the circuitry for sampling samples the first path. Still further, the plurality of path resources comprise circuitry (442, 461), responsive to the circuitry for sampling, for establishing a first channel estimate for the first path in response to the first path and the second path. Lastly, the plurality of path resources comprises circuitry (441, 462), responsive to the circuitry for sampling, for establishing a second channel estimate for the second path in response to the first path and the second path.

    摘要翻译： 无线通信网络（10）。 该网络包括无线接收器（14）。 接收机包括用于接收多个路径形式的多个帧的至少一个天线（AT14）。 多个帧中的每一个由多个码片调制，并且多个码片中的码片具有相似的码片持续时间。 所述接收机还包括多个路径资源（F1，F2），并且所述多个路径资源包括被配置为从所述多个路径中的第一路径接收第一多个符号的第一路径资源（F1）和第二路径 资源（F2），被配置为从所述多个路径中的第二路径接收第二多个符号。 多个路径资源还包括用于在从用于采样的电路采样第一路径的时间起的时间小于芯片持续时间的时间对第二路径进行采样的电路。 此外，多个路径资源包括响应于用于采样的电路的电路（442,461），用于响应于第一路径和第二路径建立用于第一路径的第一信道估计。 最后，多个路径资源包括响应于用于采样的电路的响应于第一路径和第二路径建立第二路径的第二信道估计的电路（441,462）。

    Antenna reception diversity in wireless communications
    45.
    发明授权
    Antenna reception diversity in wireless communications 有权
    无线通信中的天线接收分集

    公开(公告)号：US06714774B1

    公开(公告)日：2004-03-30

    申请号：US09634052

    申请日：2000-08-08

    申请人： Mohammed H. Nafie ,  Anand G. Dabak ,  Timothy M. Schmidl

    发明人： Mohammed H. Nafie ,  Anand G. Dabak ,  Timothy M. Schmidl

    IPC分类号： H04B106

    CPC分类号： H04B7/0837

    摘要： Antenna reception diversity is provided for wireless communications such that a received signal (r) can be produced by combining antenna signals (vi) with their associated fading amplitudes (&agr;i) as estimated by a linear receiver (32). Also, antenna signals (v1i) can be combined with their associated correlation values (&agr;1i) in place of estimated fading amplitudes. Further, inherent characteristics of a non-linear wireless communication receiver can be exploited such that a received signal (r2, r3) can be produced without any additional overhead that would otherwise be needed to provide estimated fading amplitudes.

    摘要翻译： 为无线通信提供天线接收分集，使得可以通过将天线信号（vi）与由线性接收机（32）估计的相关联的衰落幅度（alphai）组合来产生接收信号（r）。 此外，可以将天线信号（v1i）与其相关联的相关值（α1i）组合以代替估计的衰落幅度。 此外，可以利用非线性无线通信接收机的固有特性，使得可以产生接收信号（r2，r3），而不需要额外的开销来提供估计的衰落幅度。

    Estimation of doppler frequency through autocorrelation of pilot symbols
    46.
    发明授权
    Estimation of doppler frequency through autocorrelation of pilot symbols 有权
    通过导频符号的自相关估计多普勒频率

    公开(公告)号：US06424642B1

    公开(公告)日：2002-07-23

    申请号：US09224632

    申请日：1998-12-31

    申请人： Timothy M. Schmidl ,  Anand G. Dabak

    发明人： Timothy M. Schmidl ,  Anand G. Dabak

    IPC分类号： H04B7216

    CPC分类号： H04B7/01 ,  H04B7/0669 ,  H04L1/0618

    摘要： A circuit coupled to receive a sequence of signals is designed with a multiplication circuit (416, 420) coupled to receive a first signal, a second signal and a complex conjugate of the first signal. The second signal follows the first signal in time. The multiplication circuit produces a first product sequence of the first signal and the complex conjugate and a second product sequence of the second signal and the complex conjugate. A summation circuit (424, 426) is coupled to receive the first product sequence and the second product sequence. The summation circuit produces a first sum of the first product sequence and a second sum of the second product sequence.

    摘要翻译： 耦合以接收信号序列的电路被设计成具有耦合以接收第一信号的第一信号，第二信号和第一信号的复共轭的乘法电路（416,420）。 第二个信号及时跟随第一个信号。 乘法电路产生第一信号和复共轭的第一乘积序列和第二信号和复共轭的第二乘积序列。 耦合电路（424,426）以接收第一产品序列和第二产品序列。 求和电路产生第一乘积序列的第一和和第二乘积序列的第二和。

    User data indicator for discontinuous transmission
    47.
    发明授权
    User data indicator for discontinuous transmission 有权
    用户数据指示符用于不连续传输

    公开(公告)号：US06331975B1

    公开(公告)日：2001-12-18

    申请号：US09181510

    申请日：1998-10-28

    申请人： Srinath Hosur ,  Timothy M. Schmidl ,  Anand G. Dabak

    发明人： Srinath Hosur ,  Timothy M. Schmidl ,  Anand G. Dabak

    IPC分类号： H04J1100

    CPC分类号： H04W52/54 ,  H04J13/00

    摘要： A communication circuit is designed with a processing circuit (11) coupled to receive a plurality of first control signals (40-45) and a second control signal (46) from a source external to the communication circuit during a predetermined time (49). The plurality of first control signals are equally spaced apart in time. The second control signal is proximate one of the first control signals (40). The processing circuit produces a power control signal in response to at least two of the plurality of first control signals. A serial circuit is coupled to receive the power control signal. The serial circuit produces the plurality of third control signals and the power control signal.

    摘要翻译： 通信电路被设计成具有耦合以在预定时间（49）期间从通信电路外部的源接收多个第一控制信号（40-45）和第二控制信号（46）的处理电路（11）。 多个第一控制信号在时间上相等间隔。 第二控制信号接近第一控制信号（40）之一。 处理电路响应于多个第一控制信号中的至少两个产生功率控制信号。 串联电路被耦合以接收功率控制信号。 串行电路产生多个第三控制信号和功率控制信号。

    Space time transmit diversity for TDD/WCDMA systems
    50.
    发明授权
    Space time transmit diversity for TDD/WCDMA systems 有权
    TDD / WCDMA系统的时空传输分集

    公开(公告)号：US08290084B2

    公开(公告)日：2012-10-16

    申请号：US12720963

    申请日：2010-03-10

    申请人： Anand G. Dabak ,  Timothy M. Schmidl ,  Chaitali Sengupta

    发明人： Anand G. Dabak ,  Timothy M. Schmidl ,  Chaitali Sengupta

    IPC分类号： H04L27/00

    CPC分类号： H04L25/03063 ,  H04B1/7093 ,  H04B1/7105 ,  H04B1/71052 ,  H04B1/71075 ,  H04B1/7115 ,  H04B7/0669 ,  H04B7/0897 ,  H04L1/005 ,  H04L1/0618 ,  H04L25/0224

    摘要： A circuit is designed with a matched filter circuit including a plurality of fingers (700, 702, 704) coupled to receive a data symbol. Each finger corresponds to a respective path of the data symbol. Each finger produces a respective output signal. A plurality of decoder circuits (706, 708, 710) receives the respective output signal from a respective finger of the plurality of fingers. Each decoder circuit produces a respective output signal. A joint detector circuit (1310) is coupled to receive each respective output signal from the plurality of decoder circuits. The joint detector circuit produces an output signal corresponding to a predetermined code.

    摘要翻译： 电路设计有匹配滤波器电路，该匹配滤波器电路包括耦合以接收数据符号的多个指状物（700,702,704）。 每个手指对应于数据符号的相应路径。 每个手指产生相应的输出信号。 多个解码器电路（706,708,710）从多个手指的相应手指接收相应的输出信号。 每个解码器电路产生相应的输出信号。 联合检测器电路（1310）被耦合以从多个解码器电路接收每个相应的输出信号。 联合检测器电路产生对应于预定代码的输出信号。