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    • 77. 发明申请
    • Intermodulation Cancellation of Third-order Distortion in an FDD Receiver
    • FDD接收机三阶失真的互调取消
    • US20150358047A1
    • 2015-12-10
    • US14300290
    • 2014-06-10
    • Apple Inc.
    • Konstantinos SarrigeorgidisTarik TabetSyed A. Mujtaba
    • H04B1/54H04B1/12
    • H04B1/54H04B1/12H04B1/123H04B1/525
    • A transceiver device may include a transmit path that generates a modulated transmit signal based on a baseband signal, and a receive path that receives a receive signal, which is subject to third-order order distortion caused by intermodulation noise resulting from a continuous wave blocker intermodulating with transmit leakage from the transmit path. The transceiver may also include a compensation path that models portions of the transmit path and the receive path, and generates a replica signal representative of the third-order order distortion according to at least a specified function and the modeled portions of the transmit path and the receive path. The compensation path also filters the replica signal and subtracts the filtered replica signal from the receive signal to eliminate the third-order order distortion caused by the intermodulation noise. The filtering of the replica signal may be performed by programmable finite impulse response filters.
    • 收发器设备可以包括基于基带信号生成调制的发送信号的发送路径和接收接收信号的接收路径,该接收信号受到由连续波阻塞器互调产生的互调噪声引起的三阶失真 来自发射路径的发射泄漏。 收发机还可以包括对发送路径和接收路径的部分进行建模的补偿路径,并且根据至少一个指定的功能和发送路径的建模部分和生成表示三阶失真的副本信号, 接收路径。 补偿路径还对复制信号进行滤波,并从接收信号中减去滤波后的复制信号,以消除由互调噪声引起的三阶失真。 可以通过可编程有限脉冲响应滤波器来执行复制信号的滤波。
    • 78. 发明申请
    • Antenna Switching System with Adaptive Switching Criteria
    • 具有自适应开关标准的天线开关系统
    • US20150188619A1
    • 2015-07-02
    • US14645501
    • 2015-03-12
    • Apple Inc.
    • Syed A. MujtabaKee-Bong Song
    • H04B7/08H04B1/10G01S19/13
    • H04B1/0064G01S19/13H04B1/1027H04B7/0808H04B7/082H04B7/0834H04W64/006H04W88/06
    • Electronic devices may be provided that contain wireless communications circuitry. The wireless communications circuitry may include radio-frequency transceiver circuitry coupled to multiple antennas. Signal strength measurements may be gathered using the antennas and corresponding signal strength difference measurements may be produced to reflect which of the antennas is exhibiting superior performing. Information may be gathered relating to the fading environment of the communications circuitry, such as whether the wireless communications circuitry is transitioning between a fast fading environment and a slow fading environment. For example, the wireless communications circuitry may further include a satellite positioning system receiver or an accelerometer, which may be used in gathering the information. The difference measurements may be filtered and compared to antenna switching criteria such as antenna switching thresholds. An antenna switching threshold may be adjusted in real time based at least in part on the gathered information.
    • 可以提供包含无线通信电路的电子设备。 无线通信电路可以包括耦合到多个天线的射频收发器电路。 可以使用天线收集信号强度测量值,并且可以产生对应的信号强度差异测量结果,以反映哪些天线表现出优异的性能。 可以收集关于通信电路的衰落环境的信息,诸如无线通信电路是否在快速衰落环境和慢衰落环境之间转变。 例如,无线通信电路还可以包括可用于收集信息的卫星定位系统接收机或加速度计。 差分测量可以被滤波并且与诸如天线切换阈值的天线切换标准进行比较。 可以至少部分地基于所收集的信息实时地调整天线切换阈值。