公开(公告)号：US20050111597A1

公开(公告)日：2005-05-26

申请号：US10659906

申请日：2003-09-11

申请人： Anand Dabak ,  Rohit Negi

发明人： Anand Dabak ,  Rohit Negi

IPC分类号： H04J13/00 ,  H04B7/02 ,  H04B7/06 ,  H04B7/26 ,  H04L1/00 ,  H04L1/02 ,  H04L1/06

CPC分类号： H04B7/0669 ,  H04L1/0065 ,  H04L1/0071 ,  H04L1/0618 ,  H04L1/0631

摘要： A mobile communication system is designed with an input circuit coupled to receive a first plurality of signals (rj(i+τj), i=0−N−1) during a first time (T0-T1) from an external source and coupled to receive a second plurality of signals (rj(i+τj), i=N−2N−1) during a second time (T1-T2) from the external source. The input circuit receives each of the first and second plurality of signals along respective first and second paths (j). The input circuit produces a first input signal (Rj1) and a second input signal (Rj2) from the respective first and second plurality of signals. A correction circuit is coupled to receive a first estimate signal (αj1), a second estimate signal (αj2) and the first and second input signals. The correction circuit produces a first symbol estimate ({overscore (S)}1) in response to the first and second estimate signals and the first and second input signals. The correction circuit produces a second symbol estimate ({overscore (S)}2) in response to the first and second estimate signals and the first and second input signals.

摘要翻译： 移动通信系统被设计成具有耦合以接收第一多个信号（i = 0-N-1）的第一多个信号的输入电路， 在来自外部源的第一时间（T 0 -T 1）期间，并且被耦合以接收第二多个信号（r 1，j 2，...，i = N-2N-1）在来自外部源的第二时间（T 1 -T 2）期间。 输入电路沿着相应的第一和第二路径（j）接收第一和第二多个信号中的每一个。 输入电路产生第一输入信号（R SUB），第二输入信号（R SUB）和第二输入信号 ）从相应的第一和第二多个信号。 耦合校正电路以接收第一估计信号（第一估计信号），第二估计信号（α2，j 2， / SUP>）和第一和第二输入信号。 所述校正电路响应于所述第一和第二估计信号以及所述第一和第二输入信号产生第一符号估计（{overcore（S SUB> 1）），所述校正电路产生第二符号估计（{overscore （S SUB2）响应于第一和第二估计信号以及第一和第二输入信号。

公开(公告)号：US06891882B1

公开(公告)日：2005-05-10

申请号：US09649390

申请日：2000-08-28

申请人： Srinath Hosur ,  Anand Dabak

发明人： Srinath Hosur ,  Anand Dabak

IPC分类号： H04B1/707 ,  H04J13/00 ,  H04L27/227 ,  H04B1/69 ,  H04B7/216

CPC分类号： H04L27/2278 ,  H04B1/70735 ,  H04B1/7077 ,  H04B1/7083 ,  H04B2201/70702 ,  H04J13/00

摘要： Decoding CFC codewords in the form of sums of QPSK-modulated spread symbols in a spread spectrum communications systems using comma-free codes with elements made of sums of QPSK-modulated secondary synchronization codes.

摘要翻译： 以扩频通信系统中的QPSK调制扩展符号和的形式对CFC码字进行解码，使用不带QPSK调制次同步码的元素的无逗号码。

公开(公告)号：US20050026566A1

公开(公告)日：2005-02-03

申请号：US10919470

申请日：2004-08-16

申请人： Anand Dabak ,  Eko Onggosanusi

发明人： Anand Dabak ,  Eko Onggosanusi

IPC分类号： H04B7/06 ,  H04B7/08 ,  H04B17/00 ,  H04B1/02 ,  H04B1/04

CPC分类号： H04B7/0615 ,  H04B7/0617 ,  H04B7/0634 ,  H04B7/0645 ,  H04B7/0654 ,  H04B7/0857 ,  H04B17/104 ,  H04B17/24

摘要： A wireless communication system (10). The system comprises a user station (12). The user station comprises despreading circuitry (22) for receiving and despreading a plurality of slots received from at least a first transmit antenna (A121) and a second transmit antenna (A122) at a transmitting station (14). Each of the plurality of slots comprises a first channel (DPCH) comprising a first set of pilot symbols and a second channel (PCCPCH) comprising a second set of pilot symbols. The user station further comprises circuitry (50) for measuring a first channel measurement (α1,n) for each given slot in the plurality of slots from the first transmit antenna and in response to the first set of pilot symbols in the given slot. The user station further comprises circuitry (50) for measuring a second channel measurement (α2,n) for each given slot in the plurality of slots from the second transmit antenna and in response to the first set of pilot symbols in the given slot. The user station further comprises circuitry (52) for measuring a phase difference value (φ2(n)) for each given slot in the plurality of slots in response to the first channel measurement and the second channel measurement for the given slot and in response to a ninety degree rotation of the given slot relative to a slot which was received by the despreading circuitry immediately preceding the given slot.

摘要翻译： 一种无线通信系统（10）。 该系统包括用户站（12）。 用户站包括解扩电路（22），用于在发射站（14）处接收和解扩从至少第一发射天线（A121）和第二发射天线（A122）接收的多个时隙。 多个时隙中的每一个包括包括第一组导频符号的第一信道（DPCH）和包括第二组导频符号的第二信道（PCCPCH）。 用户站还包括用于测量来自第一发射天线的多个时隙中的每个给定时隙的第一信道测量（α1，n）以及响应于给定时隙中的第一组导频符号的电路（50）。 用户站还包括电路（50），用于响应于给定时隙中的第一组导频符号，测量来自第二发射天线的多个时隙中的每个给定时隙的第二信道测量（α2，n）。 用户站还包括电路（52），用于响应于给定时隙的第一信道测量和第二信道测量以及响应于第二信道测量而测量多个时隙中的每个给定时隙的相位差值（phi2（n））， 给定时隙相对于由紧接在给定时隙之前的解扩电路接收的时隙的九十度旋转。

公开(公告)号：US08040986B2

公开(公告)日：2011-10-18

申请号：US10723215

申请日：2003-11-26

申请人： Michael O. Polley ,  Donald P. Shaver ,  Srinath Hosur ,  Eko Onggosanusi ,  Muhammad Z. Ikram ,  Anand Dabak

发明人： Michael O. Polley ,  Donald P. Shaver ,  Srinath Hosur ,  Eko Onggosanusi ,  Muhammad Z. Ikram ,  Anand Dabak

IPC分类号： H04B7/10 ,  H04L1/02

CPC分类号： H04W52/42

摘要： A system comprises a wireless device that communicates across a spectrum having a plurality of sub-channels. The wireless device comprises a plurality of antennas through which the wireless device communicates with another wireless device, wherein each antenna communicates with the other wireless device via an associated communication pathway. The wireless device further comprises sub-channel power analysis logic coupled to the antennas and adapted to determine which communication pathway has the highest communication quality on a sub-channel by sub-channel basis. The wireless device still further comprises diversity selection logic coupled to the sub-channel power analysis logic and adapted to determine a weighting vector for an associated antenna based on the communication quality, wherein the weighting vector specifies a relative transmission power for each sub-channel for the associated antenna.

摘要翻译： 系统包括在具有多个子信道的频谱上进行通信的无线设备。 无线设备包括多个天线，无线设备通过该天线与另一无线设备通信，其中每个天线经由相关联的通信路径与另一无线设备通信。 无线设备还包括耦合到天线的子信道功率分析逻辑，并且适于通过子信道来确定子信道上哪个通信路径具有最高通信质量。 无线设备还包括耦合到子信道功率分析逻辑的分集选择逻辑，并且适于基于通信质量来确定相关天线的加权向量，其中加权向量规定每个子信道的相对发射功率，用于 相关天线。

公开(公告)号：US07941164B2

公开(公告)日：2011-05-10

申请号：US11069595

申请日：2005-02-28

申请人： Eko Onggosanusi ,  Anand Dabak

发明人： Eko Onggosanusi ,  Anand Dabak

IPC分类号： H04Q7/20

CPC分类号： G01S19/254

摘要： A cellular communicating device (10). The device comprises means (221) for communicating bi-directional data to and from a cellular transceiver station along a bi -directional channel (30S). The device also comprises means (222) for receiving SPS information. The device also comprises means (223) for receiving broadcast Doppler information from a source other than the bi-directional channel and an SPS system. Lastly, the device also comprises means (24) for determining a location fix of the electronic device in response to the SPS information and the broadcast Doppler information.

摘要翻译： 一种蜂窝通信设备（10）。 该设备包括用于沿双向信道（30S）向蜂窝收发器站和从蜂窝收发器站向双向数据传送双向数据的装置（221）。 该装置还包括用于接收SPS信息的装置（222）。 该设备还包括用于从除双向通道之外的源和SPS系统接收广播多普勒信息的装置（223）。 最后，设备还包括用于响应于SPS信息和广播多普勒信息来确定电子设备的定位的装置（24）。

公开(公告)号：US07634020B2

公开(公告)日：2009-12-15

申请号：US10782095

申请日：2004-02-19

申请人： Anuj Batra ,  Jaiganesh Balakrishnan ,  Anand Dabak

发明人： Anuj Batra ,  Jaiganesh Balakrishnan ,  Anand Dabak

IPC分类号： H04L27/00

CPC分类号： H04B1/7093 ,  H04B1/709 ,  H04L27/2613

摘要： System and method for simplifying preamble detection and reducing power consumption in receivers. A preferred embodiment comprises a preamble made up of two sequences, a first sequence that is specified in the time domain and a second sequence that is specified in the frequency domain. The first sequence which comprises multiple copies of a time domain code sequence can allow easy detection of the preamble while the second sequence comprises multiple copies of a frequency domain code sequence and allows easy determination of the frequency response of the communications channel. A hierarchical sequence can be used to allow multi-stage correlation. This can result in a less complex correlator, hence lower power consumption. Piconets can use different code sequences to allow rapid determination of the source of a transmission without requiring the receiver to decode the entire transmission.

摘要翻译： 用于简化前导码检测并降低接收机功耗的系统和方法。 优选实施例包括由两个序列组成的前导码，在时域中指定的第一序列和在频域中指定的第二序列。 包括时域码序列的多个副本的第一序列可以容易地检测前置码，而第二序列包括频域码序列的多个副本，并且允许容易地确定通信信道的频率响应。 可以使用分级序列来允许多级相关。 这可能导致较不复杂的相关器，从而降低功耗。 微微网可以使用不同的码序列来快速确定传输源，而不需要接收机对整个传输进行解码。

公开(公告)号：US07369523B2

公开(公告)日：2008-05-06

申请号：US10370991

申请日：2003-02-20

申请人： Aris Papasakellariou ,  Timothy Schmidl ,  Anand Dabak

发明人： Aris Papasakellariou ,  Timothy Schmidl ,  Anand Dabak

IPC分类号： H04B7/216 ,  H04B7/24 ,  H04B17/00 ,  H04Q7/00

CPC分类号： H04B1/7107 ,  H04B1/7115 ,  H04B7/216

摘要： A method described evaluates the pilot-to-data power ratio based on the values of the demodulated data at the output of a receiver such as a conventional maximal ratio combiner or an equalizer receiver. Since the data are not scaled to their particular decision grid, their distribution and statistics deviate from the ones defined by the known decision grid. Measuring these deviations of the statistics, the pilot-to-data power ratio and the appropriate demodulated data scaling can be accurately determined. Subsequent data processing may then commence.

摘要翻译： 所描述的方法基于诸如常规最大比组合器或均衡器接收器的接收器的输出处的解调数据的值来评估导频到数据功率比。 由于数据没有缩放到其特定的决策网格，它们的分布和统计数据与已知决策网格定义的数据不符。 测量统计的这些偏差，可以准确地确定导频到数据功率比和适当的解调数据缩放。 随后的数据处理可以开始。

公开(公告)号：US20080089455A1

公开(公告)日：2008-04-17

申请号：US11931629

申请日：2007-10-31

申请人： Eko Onggosanusi ,  Anand Dabak ,  Timothy Schmidl

发明人： Eko Onggosanusi ,  Anand Dabak ,  Timothy Schmidl

IPC分类号： H03D1/04

CPC分类号： H04L25/0202

摘要： System and method for interference cancellation in a digital wireless communications system. A preferred embodiment comprises sampling a received signal wherein the received signal is real-valued, rotating the sampled received signal by a specified amount, extracting in-phase and quadrature phase streams from the rotated, sampled received signal, applying an interference suppression filter and combining the filtered streams. The output of the combining operation can be de-correlated (by whitening) if there is excessive correlation.

摘要翻译： 数字无线通信系统中干扰消除的系统和方法。 优选实施例包括对接收信号进行采样，其中接收到的信号是实值的，将采样的接收信号旋转指定量，从旋转的采样的接收信号中提取同相和正交相位流，应用干扰抑制滤波器和组合 过滤的流。 如果存在过度的相关性，组合操作的输出可以被去相关（通过白化）。

公开(公告)号：US20070076804A1

公开(公告)日：2007-04-05

申请号：US11240203

申请日：2005-09-30

申请人： Charles Sestok ,  Anand Dabak ,  Jaiganesh Balakrishnan

发明人： Charles Sestok ,  Anand Dabak ,  Jaiganesh Balakrishnan

IPC分类号： H04K1/10

CPC分类号： H04L25/0232 ,  H04B1/123 ,  H04L27/261

摘要： The present invention provides an image-rejecting channel estimator for use with an orthogonal frequency division multiplex (OFDM) receiver employing scattered pilot channel estimates. In one embodiment, the image-rejecting channel estimator includes an estimation interpolator configured to provide channel estimates through time interpolation and frequency interpolation employing the scattered pilot channel estimates. The image-rejecting channel estimator also includes an image-rejection formatter coupled to the estimation interpolator and configured to provide image-rejection filtering to suppress an image in an output spectrum of the channel estimates from at least one of the time interpolation and frequency interpolation.

摘要翻译： 本发明提供一种与使用分散导频信道估计的正交频分复用（OFDM）接收机一起使用的图像拒绝信道估计器。 在一个实施例中，图像拒绝信道估计器包括估计内插器，被配置为通过使用分散导频信道估计的时间插值和频率插值来提供信道估计。 图像拒绝信道估计器还包括耦合到估计内插器的镜像拒绝格式器，并且被配置为提供镜像抑制滤波以从时间插值和频率插值中的至少一个抑制信道估计的输出频谱中的图像。

公开(公告)号：US20060215795A1

公开(公告)日：2006-09-28

申请号：US11382580

申请日：2006-05-10

申请人： Mohammed Nafie ,  Timothy Schmidl ,  Anand Dabak

发明人： Mohammed Nafie ,  Timothy Schmidl ,  Anand Dabak

IPC分类号： H03D1/04

CPC分类号： H04B1/715 ,  H04B1/1036 ,  H04B2001/7152 ,  H04B2001/7154

摘要： Interference cancellation/suppression by a wide band radio (100) includes the steps of searching for all narrow band interferer signals such as Bluetooth signals (502). Communicating with the detected Bluetooth piconets (504). Estimating when the Bluetooth signals will occur (506) using the information received during step (504) . And using a suppression technique in association with the estimations as to when/where the interfering signals will occur in order to counter the interfering signal(s). In an alternate embodiment, both the narrow band (304) and wide band (302) signals are stored (306). Then the one or more narrow band Bluetooth signal(s) (304) and decoded (308) and subtracted (308) from the wide band packet prior to it being decoded (312).

摘要翻译： 通过宽带无线电（100）的干扰消除/抑制包括搜索诸如蓝牙信号（502）的所有窄带干扰信号的步骤。 与检测到的蓝牙微微网（504）进行通信。 使用在步骤（504）期间接收到的信息来估计何时发生蓝牙信号（506）。 并且使用抑制技术与关于何时/何处发生干扰信号以估计干扰信号的估计相关联。 在替代实施例中，窄带（304）和宽带（302）信号都被存储（306）。 然后，一个或多个窄带蓝牙信号（304）和解码（308）并在其被解码之前从宽带分组中减去（308）（312）。