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    Method and apparatus for coherent reception in a spread-spectrum receiver
    21.
    发明授权
    Method and apparatus for coherent reception in a spread-spectrum receiver 失效
    在扩频接收机中进行相干接收的方法和装置

    公开(公告)号：US5659573A

    公开(公告)日：1997-08-19

    申请号：US317501

    申请日：1994-10-04

    申请人： Eugene J. Bruckert ,  Fuyun Ling

    发明人： Eugene J. Bruckert ,  Fuyun Ling

    IPC分类号： H04B1/707 ,  H04B1/7087 ,  H04B1/7117 ,  H04J3/06 ,  H04L25/02 ,  H04L27/227 ,  H04K1/00 ,  H04L7/00

    CPC分类号： H04B1/7087 ,  H04B1/707 ,  H04J3/0605 ,  H04L25/0202 ,  H04L27/2276 ,  H04B1/7117 ,  H04B2201/70703 ,  H04B2201/70705

    摘要： A method and apparatus is provided for facilitating coherent communication reception. A received reference symbol coded spread spectrum communication signal is despread with a spreading code to derive a stream of reference samples and a stream of data samples. The channel response is estimated by utilizing the stream of reference samples. An offset frequency detector determines an offset to be applied to the received signal via a frequency locked loop, while a timing control compensates for slow timing drift and fast fading based on power estimates derived from the stream of reference samples and/or the stream of data samples. A slot detector controls gates which optimize the timing control and frequency offset detector outputs from the various timing branches. Thus an improved detection of estimated data symbols from the stream of received data samples is provided.

    摘要翻译： 提供了一种用于促进相干通信接收的方法和装置。 接收到的参考符号编码的扩展频谱通信信号用扩展码进行解扩，以导出参考样本流和数据采样流。 通过利用参考样本流来估计信道响应。 偏移频率检测器通过频率锁定环来确定要施加到接收信号的偏移，而定时控制基于从参考样本流和/或数据流导出的功率估计来补偿慢定时漂移和快衰落 样品。 时隙检测器控制门，其优化来自各种定时分支的定时控制和频率偏移检测器输出。 因此，提供了从接收的数据样本流中对估计数据符号的改进的检测。

    Path gain estimation in a receiver
    23.
    发明授权
    Path gain estimation in a receiver 失效
    接收机中的路径增益估计

    公开(公告)号：US5442661A

    公开(公告)日：1995-08-15

    申请号：US106250

    申请日：1993-08-13

    申请人： David D. Falconer

    发明人： David D. Falconer

    IPC分类号： H04B1/7093 ,  H04B1/7115 ,  H04B1/7117 ,  H04B7/00 ,  H04L27/30 ,  H04B1/69

    CPC分类号： H04B1/7115 ,  H04B1/7093 ,  H04B1/7117

    摘要： A coherent RAKE receiver utilizes a "blind block" path gain estimation scheme, based on a maximum likelihood criterion, to estimate path gains in the receiver. It is "blind" in that preliminary hard decisions on coded bits (i.e., coded bits from the corrupt transmitted signal) are not used. Instead, a form of soft decisions are used. It is a "block" scheme in that the complex path gains are estimated for an isolated block, for example a block of B correlator outputs. The path gains varying with time are approximated to be linear in time such that the average path gain and the slope of the path gain per path can be utilized to estimate the path gain. The path gain estimation scheme overcomes the shortcomings of typical CDMA systems where there is no assurance of continuous transmission (except for full-rate 9600 b/s transmission) upon which to base a FIR filter-type prediction scheme.

    摘要翻译： 相干RAKE接收机利用基于最大似然准则的“盲块”路径增益估计方案来估计接收机中的路径增益。 因为不使用对编码比特（即来自损坏的发送信号的编码比特）的初步硬判决是“盲”的。 相反，使用一种软的决定。 这是一个“块”方案，因为对于一个隔离块估计了复杂路径增益，例如一个B相关器输出块。 随时间变化的路径增益近似为时间线性，使得平均路径增益和每条路径的路径增益的斜率可以用于估计路径增益。 路径增益估计方案克服了基于FIR滤波器类型预测方案的典型CDMA系统的缺点，其中不能保证连续传输（全速率9600b / s传输除外）。

    Multipath filtering for wireless RF signals
    24.
    发明授权
    Multipath filtering for wireless RF signals 有权

    公开(公告)号：US11451287B1

    公开(公告)日：2022-09-20

    申请号：US17203255

    申请日：2021-03-16

    申请人： Pivotal Commware, Inc.

    发明人： Srinivas Sivaprakasam ,  Timothy Hudson Mason

    IPC分类号： H04B7/08 ,  H04B1/7117 ,  H04W72/04 ,  H04B7/06

    摘要： Filtering for sampled data representing uplink wireless RF signals monitored by a pair of antennas is provided to improve accuracy in determining an angular location of an identified UE. An extracted portion of the filtered sampled data is used to improve accuracy in determining an angular location of the identified UE. The extracted portion represents direct path uplink wireless RF signals that have traveled by a line of sight between the pair of antennas and the identified UE. Another portion of the filtered sampled data is cancelled, which represents multiple path (multipath) uplink wireless RF signals that have traveled a longer distance than the direct path signals due to reflection from one or more surfaces on multiple paths between the identified UE and the pair of antennas.

    Base station and method therein
    25.
    发明授权
    Base station and method therein 审中-公开

    公开(公告)号：US10673656B2

    公开(公告)日：2020-06-02

    申请号：US16263584

    申请日：2019-01-31

    申请人： NEC CORPORATION

    发明人： Kenichiro Yamazaki

    IPC分类号： H04W4/00 ,  H04L25/02 ,  H04B7/06 ,  H04B7/10 ,  H04B1/7117 ,  H04B1/7113

    摘要： In order to make it possible to prevent occurrence of an interference among terminal apparatuses when a base station forms a beam toward a terminal apparatus by beam-forming to transmit a downlink signal, and to improve reception quality at a terminal apparatus. A base station of the present disclosure includes a memory storing instructions and one or more processors configured to execute the instructions to: perform channel estimations respectively on a plurality of terminal apparatuses; and determine a transmission layer of a target terminal apparatus by comparing angular profiles respectively obtained on the basis of channel estimates on the target terminal apparatus and at least one comparable terminal apparatus out of the plurality of terminal apparatuses and performing a path exclusion process to exclude, from transmission layers of the target terminal apparatus, a path that falls within a certain angular range around a path angle indicated by an angular profile of the at least one comparable terminal apparatus.

    BASE STATION AND METHOD THEREIN
    27.
    发明申请
    BASE STATION AND METHOD THEREIN 审中-公开

    公开(公告)号：US20190280902A1

    公开(公告)日：2019-09-12

    申请号：US16263584

    申请日：2019-01-31

    申请人： NEC CORPORATION

    发明人： Kenichiro YAMAZAKI

    IPC分类号： H04L25/02 ,  H04B7/06 ,  H04B1/7113 ,  H04B1/7117 ,  H04B7/10

    摘要： In order to make it possible to prevent occurrence of an interference among terminal apparatuses when a base station forms a beam toward a terminal apparatus by beam-forming to transmit a downlink signal, and to improve reception quality at a terminal apparatus. A base station of the present disclosure includes a memory storing instructions and one or more processors configured to execute the instructions to: perform channel estimations respectively on a plurality of terminal apparatuses; and determine a transmission layer of a target terminal apparatus by comparing angular profiles respectively obtained on the basis of channel estimates on the target terminal apparatus and at least one comparable terminal apparatus out of the plurality of terminal apparatuses and performing a path exclusion process to exclude, from transmission layers of the target terminal apparatus, a path that falls within a certain angular range around a path angle indicated by an angular profile of the at least one comparable terminal apparatus.

    Adaptive decoding of spread spectrum signals using multiple correlator peaks
    28.
    发明授权
    Adaptive decoding of spread spectrum signals using multiple correlator peaks 有权

    公开(公告)号：US10396846B1

    公开(公告)日：2019-08-27

    申请号：US16158794

    申请日：2018-10-12

    申请人： Cisco Technology, Inc.

    发明人： Ragnvald Balch Barth ,  Knut Inge Hvidsten ,  Michael A. Ramalho

    IPC分类号： H04B1/7075 ,  H04B1/7117 ,  H04B17/336 ,  H04B1/7105 ,  H04B1/7163 ,  H04B1/717

    摘要： Time-offset, time-overlapping signals are received. The signals each include a pilot code, and at least some of the signals each include a user code occupying a time slot time-synchronized to a respective pilot code. Time-offset cross-correlation peaks for respective ones of the pilot codes are generated, each cross-correlation peak indicating a respective one of the time slots. For each time slot a respective projection vector including user code projections each indicative of whether a respective user code of known user codes is present in the time slot is generated. Particular ones of the projection vectors are selectively combined into an aggregate projection vector of aggregate user code projections, such that the aggregate projection vector has a signal-to-noise ratio (SNR) greater than the projection vectors individually. The user code is selected from among the known user codes based on the aggregate user code projections of the aggregate projection vector.

    Method and device for adjusting signal of receiving device in mobile communication system
    29.
    发明授权
    Method and device for adjusting signal of receiving device in mobile communication system 有权

    公开(公告)号：US10148315B2

    公开(公告)日：2018-12-04

    申请号：US15552990

    申请日：2016-02-25

    申请人： Samsung Electronics Co., Ltd.

    发明人： Jaesang Ham ,  Hyuncheol Kim ,  Yusuk Yun

    IPC分类号： H04B1/71 ,  H04B1/7117 ,  H04B1/709 ,  H04B7/08

    摘要： The present invention relates to a method and a device for adjusting a signal of a receiving device in a mobile communication system and, more specifically, to a method for adjusting a signal of a receiving device in a mobile communication system, the method comprising the steps of: receiving signals from at least two antennas; calculating at least one correlation value by using the received signals; obtaining a delay difference value between the signals based on the at least one calculated correlation value; and outputting adjusted signals generated by adjusting the received signals based on the obtained delay difference value.