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    • 1. 发明授权
    • System and method for the acquisition of a non-geosynchronous satellite
signal
    • 用于获取非地球同步卫星信号的系统和方法
    • US5929808A
    • 1999-07-27
    • US949989
    • 1997-10-14
    • Amer A. HassanSami M. HinediJames R. Miller
    • Amer A. HassanSami M. HinediJames R. Miller
    • H01Q1/12H01Q3/08H01Q21/22H01Q3/00
    • H01Q1/1257H01Q21/22H01Q3/08
    • An antenna having multiple antenna elements that are selectively activated performs an initial acquisition of a satellite signal by activating only a few of the antenna elements. This results in a broad beam width and increases the likelihood of detecting the signal from the satellite. When the satellite signal is initially detected, the system increases the number of active elements to narrow the beam width. The system incrementally increases the number of active antenna elements until the detected signal from the satellite exceeds a predetermined threshold. At that point, the location of the satellite may be precisely determined and all antenna elements activated to lock onto the satellite signal. If the antenna loses acquisition of the satellite signal, the reverse process may be implemented whereby some elements are selectively deactivated to broaden the beam width of the antenna in an effort to reacquire the satellite signal. When the satellite signal is reacquired, the antenna elements are incrementally reactivated until all antenna elements are active.
    • 具有选择性激活的多个天线元件的天线通过仅激活几个天线元件来执行卫星信号的初始采集。 这导致宽的波束宽度并且增加了检测来自卫星的信号的可能性。 当最初检测到卫星信号时,系统增加有源元件的数量以使波束宽度变窄。 系统逐渐增加有源天线元件的数量,直到来自卫星的检测信号超过预定阈值。 此时,可以精确地确定卫星的位置,并激活所有天线元件以锁定到卫星信号上。 如果天线失去对卫星信号的采集,则可以实现相反的过程,从而一些元件被选择性地去激活以扩大天线的波束宽度,以努力重新获取卫星信号。 当重新获取卫星信号时,天线元件被递增地重新激活,直到所有天线元件都被激活。
    • 4. 发明授权
    • Channel control based on error correction values
    • 基于纠错值的通道控制
    • US09112645B2
    • 2015-08-18
    • US11801785
    • 2007-05-11
    • Amer A. HassanBernard D. AbobaKun TanJiansong Zhang
    • Amer A. HassanBernard D. AbobaKun TanJiansong Zhang
    • G06F11/00H04L1/00H04L1/20
    • H04L1/002H04L1/0002H04L1/0009H04L1/0021H04L1/203
    • A computing device configured for wireless communication may effectively control adaptation to channel conditions. The device may be configured to identify and classify conditions impacting performance of a channel so that appropriate adaptations may be made. Interference may be detected by correlating received signal strength and packet errors. High received signal strength correlated to a high packet error rate may signify presence of a source of interference. Once a source of interference is detected, other criteria may be used to determine the nature of the interference so that an adaptation that is minimally disruptive of applications can be selected. Additionally, channel degradation may be predicted by monitoring trends in error rates, including Forward Error Correction rates, and adaptation may be used before packet error rates exceed an unacceptable level.
    • 配置用于无线通信的计算设备可以有效地控制对信道条件的适配。 该设备可以被配置为识别和分类影响信道性能的条件,以便进行适当的调整。 可以通过将接收的信号强度和分组错误相关联来检测干扰。 与高分组错误率相关的高接收信号强度可能意味着存在干扰源。 一旦检测到干扰源,可以使用其他标准来确定干扰的性质,从而可以选择最小程度地破坏应用的适配。 另外,可以通过监视错误率的趋势(包括前向纠错率)来预测信道恶化,并且可以在分组错误率超过不可接受的水平之前使用适配。