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    • 73. 发明授权
    • Multiple stage hybrid spectrum sensing methods and systems for cognitive radio
    • 用于认知无线电的多级混合频谱感测方法和系统
    • US08761677B2
    • 2014-06-24
    • US13408175
    • 2012-02-29
    • Kyungtae KimYan XinSampath Rangarajan
    • Kyungtae KimYan XinSampath Rangarajan
    • H04B15/00H04B17/00
    • H04W16/14H04L27/0006H04W72/1226
    • Systems and methods for detecting unused channels in a cognitive radio system are described. In one method, data is communicated on a particular channel for a secondary receiver. In addition, a set of channels is iteratively scanned by collecting samples for each channel and for each iteration of the scanning. Here, iterations of the scanning progressively removes channels from the set of channels based on the collected samples and updates states of the channels in the set based on the collected samples to obtain a set of candidate channels. In response to detecting a pre-determined condition, communications on the particular channel are precluded and at least one of the candidate channels is evaluated by collecting additional samples on each of the channels. Further, at least one of the candidate channels is selected based on the evaluation for utilization by the one or more secondary receivers for data communication.
    • 描述了用于在认知无线电系统中检测未使用信道的系统和方法。 在一种方法中,数据在用于辅助接收机的特定信道上传送。 此外,通过收集每个通道的样本和扫描的每次迭代,迭代地扫描一组通道。 这里,扫描的迭代基于收集的采样逐渐地从信道集合中去除信道,并且基于收集的样本更新集合中的信道的状态以获得一组候选信道。 响应于检测到预定条件,排除特定信道上的通信,并且通过在每个信道上收集附加样本来评估候选信道中的至少一个。 此外,基于用于数据通信的一个或多个次要接收机的利用的评估来选择至少一个候选信道。
    • 74. 发明授权
    • Efficient channel search with energy detection
    • 有效的频道搜索与能量检测
    • US08611293B2
    • 2013-12-17
    • US13029726
    • 2011-02-17
    • Yan XinGuosen Yue
    • Yan XinGuosen Yue
    • H04W4/00
    • H04W72/02H04W24/00H04W28/18Y02D70/00
    • Methods and systems for cognitive radio channel searching are shown that include determining an energy detection threshold and a number of samples that will find a free channel in a minimum searching time, based on a number of channels K and a channel occupancy probability π0, constrained by a target acceptable misdetection probability and a target acceptable false alarm probability. The search includes an energy detection threshold and a number of samples that will find a free channel in a minimum average searching time. The K channels are searched with a signaling device using the determined energy detection threshold and the determined number of samples to find a free channel.
    • 示出了用于认知无线电信道搜索的方法和系统,其包括基于信道数目K和信道占用概率pi0来确定在最小搜索时间内将找到空闲信道的能量检测阈值和数量的样本数, 目标可接受的误检概率和目标可接受的误报概率。 搜索包括能量检测阈值和将在最小平均搜索时间内找到空闲频道的样本数。 使用确定的能量检测阈值和所确定的样本数量来搜索K个信道,使用信令装置来搜索自由信道。
    • 78. 发明申请
    • COMMUNICATION OF REDUNDANT SACCH SLOTS DURING DISCONTINUOUS TRANSMISSION MODE FOR VAMOS
    • VAMOS不连续传输模式下的冗余SACCH SLO的通信
    • US20110205947A1
    • 2011-08-25
    • US12860593
    • 2010-08-20
    • Yan XinShouxing QuWerner Kreuzer
    • Yan XinShouxing QuWerner Kreuzer
    • H04W52/02
    • H04W72/04
    • The application relates to a method for communication from a second mobile station to a base station or vice versa. In a given multiframe, a first SACCH slot associated with the second mobile station is communicated (i.e. received or transmitted or both) via the second VAMOS subchannel. In the same multiframe, a redundant second SACCH slot associated with the second mobile station is communicated. The communicating step is performed either by the second mobile station or by the base station. The second SACCH slot may be communicated via the second VAMOS subchannel, in case the second VAMOS subchannel is in DTX mode. In an alternative embodiment, the second SACCH slot may be communicated via a first VAMOS subchannel, in case the first VAMOS subchannel is in DTX mode, wherein the first and second VAMOS subchannels share a common time slot and have the same carrier frequency. Both embodiments may be combined: I.e. in case the second VAMOS subchannel is in DTX mode, the second SACCH slot is communicated via the second VAMOS subchannel, and in case the first VAMOS subchannel is in DTX mode, the second SACCH slot may be communicated via the first VAMOS subchannel.
    • 本申请涉及从第二移动站到基站的通信的方法,反之亦然。 在给定的多帧中,经由第二VAMOS子信道传送与第二移动站相关联的第一SACCH时隙(即,接收或发送或两者)。 在相同的多帧中,传送与第二移动站相关联的冗余的第二SACCH时隙。 通信步骤由第二移动站或基站执行。 在第二VAMOS子信道处于DTX模式的情况下,可以经由第二VAMOS子信道来传送第二SACCH时隙。 在替代实施例中,在第一VAMOS子信道处于DTX模式的情况下,可以经由第一VAMOS子信道来传送第二SACCH时隙,其中第一和第二VAMOS子信道共享公共时隙并具有相同的载波频率。 两个实施方案可以组合:即 在第二VAMOS子信道处于DTX模式的情况下,经由第二VAMOS子信道传送第二SACCH时隙,并且在第一VAMOS子信道处于DTX模式的情况下,可以经由第一VAMOS子信道来传送第二SACCH时隙。