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    • 11. 发明授权
    • Method and apparatus for implementing measurement based dynamic frequency hopping in wireless communication systems
    • 用于在无线通信系统中实现基于测量的动态跳频的方法和装置
    • US06826409B2
    • 2004-11-30
    • US10366379
    • 2003-02-14
    • Zoran KosticNelson Ray Sollenberger
    • Zoran KosticNelson Ray Sollenberger
    • H04B1500
    • H04B1/715H04B2001/7154H04L5/023
    • Proposed is a method for reducing interference in a frequency hopping wireless communications system. In one embodiment of the present invention, a base station and a terminal station each using an orthogonal frequency division multiplexing (OFDM) technique to simultaneously measure an interference level for each system frequency and to enable high speed frequency hop pattern changes which can follow changes in desired and interfering signal levels due to changes in co-channel interference or shadow fading. The terminal station interference level measurement values are then transmitted to the base station. Next, the base station identifies each frequency hop pattern currently in use by each terminal station communicating with that base station. The base station then uses both the base station interference level measurements and the terminal station interference level measurements to identify each frequency hop pattern in which at least one of the current system frequencies should be replaced with a system frequency having a lower interference level. Next, the base station replaces no more than a predetermined number of the current system frequencies within the identified frequency hop pattern(s). The above steps are executed at each base station within the system while ensuring that nearby interfering base stations do not replace frequencies at the same time.
    • 提出了一种减少跳频无线通信系统干扰的方法。 在本发明的一个实施例中,一个基站和一个终端站,每个基站和终端站都使用正交频分复用(OFDM)技术来同时测量每个系统频率的干扰电平,并实现能够跟随变化的高速跳频模式改变 由于同频道干扰或阴影衰落的变化而导致的期望和干扰信号电平。 然后将终端干扰电平测量值发送到基站。 接下来,基站识别与该基站通信的每个终端当前正在使用的每个频率跳频模式。 基站然后使用基站干扰电平测量和终端干扰电平测量两者来识别其中至少一个当前系统频率应被具有较低干扰电平的系统频率替代的每个频率跳频模式。 接下来,基站在所识别的频率跳频模式中替换不超过预定数量的当前系统频率。 上述步骤在系统内的每个基站执行,同时确保附近的干扰基站不同时替换频率。
    • 19. 发明授权
    • CDMA rake receiver with sub-chip resolution
    • CDMA耙式接收机具有子芯片分辨率
    • US5648983A
    • 1997-07-15
    • US427519
    • 1995-04-24
    • Zoran KosticGordana Pavlovic
    • Zoran KosticGordana Pavlovic
    • H03H21/00H04B1/7075H04B1/7093H04B1/7115H04B1/707
    • H03H21/0012H04B1/7115H04B1/70757H04B1/7093
    • A rake receiver for use in direct-sequence code-division multiple-access communication systems employs a novel channel estimator capable of resolving multipath components spaced closer than a chip interval of the direct-sequence signature sequence. The estimator utilizes a constrained iterative deconvolution technique which employs projection onto convex sets (POCS). In a matched filter rake receiver embodiment, the delay T.sub.SC between two taps of a delay line is smaller than the duration T.sub.C of a chip of pseudo-random sequence. A rake receiver constructed in this manner is capable of detecting signals that have propagated through multipath channels and that have path components spaced closer than one chip of the signal sequence (i.e. closer than the inverse of the signal bandwidth).
    • 用于直接序列码分多址通信系统的瑞克接收机采用新颖的信道估计器,其能够分辨距离直接序列签名序列的码片间隔更近的多径分量。 估计器利用对凸集(POCS)进行投影的约束迭代去卷积技术。 在匹配滤波器耙式接收机实施例中,延迟线的两个抽头之间的延迟TSC小于伪随机序列码片的持续时间TC。 以这种方式构造的耙式接收机能够检测已经通过多径信道传播并且具有比信号序列的一个码片更靠近的路径分量(即比信号带宽的倒数更近)的信号。