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    DC Offset Cancelation for Wireless Communications
    4.
    发明申请
    DC Offset Cancelation for Wireless Communications 审中-公开

    公开(公告)号：US20170195147A1

    公开(公告)日：2017-07-06

    申请号：US15375245

    申请日：2016-12-12

    Applicant: Apple Inc.

    Inventor： Konstantinos Sarrigeorgidis ,  Tarik Tabet ,  Lydi Smaini

    IPC: H04L25/08 ,  H04L5/00

    Abstract: Techniques are disclosed relating to DC interference cancelation in received wireless signals. Disclosed techniques may be performed in the digital domain, in conjunction with analog cancelation techniques. In some embodiments, a receiver apparatus operates a local oscillator at a frequency corresponding to a particular pilot symbol in a received wireless signal. In some embodiments the receiver estimates DC interference at the frequency based on the received pilot symbol (this may be facilitated by the fact that the contents of pilot symbols are known, because they are typically used for channel estimation). In some embodiments, the receiver apparatus is configured to cancel the DC interference based on the estimate to determine received data in subsequently received signals at the frequency. Disclosed techniques may allow narrowband receivers to efficiently use more of their allocated frequency bandwidth, rather than wasting bandwidth near the frequency of the local oscillator.

    DSP Assisted and On Demand RF and Analog Domain Processing for Low Power Wireless Transceivers
    5.
    发明申请
    DSP Assisted and On Demand RF and Analog Domain Processing for Low Power Wireless Transceivers 有权
    DSP辅助和按需RF和模拟域处理低功耗无线收发器

    公开(公告)号：US20160095055A1

    公开(公告)日：2016-03-31

    申请号：US14860773

    申请日：2015-09-22

    Applicant: Apple Inc.

    Inventor： Konstantinos Sarrigeorgidis ,  Tarik Tabet ,  Moustafa M. Elsayed

    IPC: H04W52/02 ,  H04B1/10

    CPC classification number: H04W52/0209 ,  H04B1/0028 ,  H04B1/10 ,  H04B1/525 ,  Y02D70/00 ,  Y02D70/1222 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/1264 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/146 ,  Y02D70/164 ,  Y02D70/168 ,  Y02D70/26 ,  Y02D70/40

    Abstract: A wireless user equipment (UE) device may include a receiver and transmitter. The UE device may dynamically vary the fidelity requirements imposed on the analog signal processing performed by the receiver and/or the transmitter in response factors such as: amount of signal interference (e.g., out-of-band signal power); modulation and coding scheme; number of spatial streams; extent of transmitter leakage; and size and/or frequency location of resources allocated to the UE device. Thus, the UE device may consume less power on average than a UE device that is designed to satisfy fixed fidelity requirements associated with a worst case reception scenario and/or a worst case transmission scenario.

    Abstract translation: 无线用户设备（UE）设备可以包括接收机和发射机。 UE设备可以以响应因素动态地改变由接收机和/或发射机执行的对模拟信号处理的保真度要求，例如：信号干扰量（例如，带外信号功率）; 调制编码方案; 空间流数; 发射机泄漏程度; 以及分配给UE设备的资源的大小和/或频率位置。 因此，UE设备可能比被设计为满足与最坏情况接收场景和/或最坏情况传输场景相​​关联的固定保真度要求的UE设备平均消耗更少的功率。

    Super-resolution technique for time-of-arrival estimation
    6.
    发明授权
    Super-resolution technique for time-of-arrival estimation 有权

    公开(公告)号：US10327221B1

    公开(公告)日：2019-06-18

    申请号：US15989266

    申请日：2018-05-25

    Applicant: Apple Inc.

    Inventor： Konstantinos Sarrigeorgidis

    IPC: H04W64/00 ,  H04B1/7073 ,  G01S11/08 ,  H04W56/00 ,  G01S11/04

    Abstract: An interface circuit in an electronic device may receive samples of wireless signals in one or more time intervals, where the wireless signals are associated with the second electronic device. For example, the samples of the wireless signals may include one or more of: time samples, spatial samples and/or frequency samples. Then, the interface circuit may split the samples of the wireless signals into parallel channels for sub-band processing that improves a resolution and/or a signal-to-noise ratio of the samples of the wireless signals. The sub-band processing may include filtering and decimation. Moreover, the sub-band processing may include a super-resolution technique, such as a multiple signal classification (MUSIC) technique and/or a linear-prediction super-resolution technique. Next, the interface circuit may combine outputs from the parallel channels to estimate a time of arrival of the wireless signals and/or a distance between the electronic device and the second electronic device.

    Receiver architecture with analog complex filter for OFDMA reception
    7.
    发明授权
    Receiver architecture with analog complex filter for OFDMA reception 有权

    公开(公告)号：US09893749B2

    公开(公告)日：2018-02-13

    申请号：US14996331

    申请日：2016-01-15

    Applicant: Apple Inc.

    Inventor： Lydi Smaini ,  Tarik Tabet ,  Konstantinos Sarrigeorgidis ,  Syed Aon Mujtaba

    IPC: H04B1/10 ,  H04L5/00

    CPC classification number: H04B1/1018 ,  H04L5/005 ,  H04L5/0053

    Abstract: Methods and devices are provided for processing a received communication signal by a UE using an analog complex filter and using a single analog-to-digital converter (ADC). A control channel of the communication signal may be decoded to determine the frequency range in which a payload channel is located. The UE may then demodulate only the frequency range containing the payload channel. A complex representation of the received payload channel may be provided to the analog complex filter, with the payload channel shifted to a non-zero frequency IF. The analog complex filter may attenuate any portion of the complex representation that falls near −IF. The UE may then convert only one component path of the filtered complex representation to a digital signal. A complex representation of the digital signal may then be generated, with the payload channel shifted to DC.

    Apparatus, system, and method for PDCCH preparation in radio frequency circuitry
    9.
    发明授权
    Apparatus, system, and method for PDCCH preparation in radio frequency circuitry 有权
    射频电路中PDCCH准备的装置，系统和方法

    公开(公告)号：US09560588B2

    公开(公告)日：2017-01-31

    申请号：US14531646

    申请日：2014-11-03

    Applicant: Apple Inc.

    Inventor： Moustafa M. Elsayed ,  Tarik Tabet ,  Konstantinos Sarrigeorgidis

    IPC: H04B1/38 ,  H04W52/02 ,  H04W72/04

    CPC classification number: H04W72/042 ,  H04W52/0209 ,  H04W52/0229 ,  H04W52/52 ,  Y02D70/00 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/1264 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/146 ,  Y02D70/164 ,  Y02D70/168 ,  Y02D70/23 ,  Y02D70/24 ,  Y02D70/26

    Abstract: An apparatus, system, and method for performing PDCCH preparation in RF circuitry are described. In one embodiment, power may be provided to a crystal oscillator to exit a first sleep state. One or more clocking signals may be provided to RF circuitry based on output from the crystal oscillator. Calibration and state restoration of the RF circuitry may be performed independent of baseband circuitry. A plurality of algorithms to prepare for receiving data form a wireless communication network may be performed independent of the baseband circuitry. After initiating the plurality of algorithms, state restoration of the baseband circuitry may be performed. Data may be received from a wireless communication network using the RF circuitry. The data may be processed using the baseband circuitry. State retention for the RF circuitry and the baseband circuitry may be performed. Finally, the crystal oscillator may be powered down to enter a second sleep state.

    Abstract translation: 描述了用于在RF电路中执行PDCCH准备的装置，系统和方法。 在一个实施例中，可以向晶体振荡器提供功率以退出第一睡眠状态。 可以基于晶体振荡器的输出向RF电路提供一个或多个时钟信号。 可以独立于基带电路来执行RF电路的校准和状态恢复。 可以独立于基带电路来执行用于准备从无线通信网络接收数据的多个算法。 在启动多个算法之后，可以执行基带电路的状态恢复。 可以使用RF电路从无线通信网络接收数据。 可以使用基带电路来处理数据。 可以执行RF电路和基带电路的状态保持。 最后，晶体振荡器可以掉电进入第二个睡眠状态。

    Intermodulation Cancellation of Third-order Distortion in an FDD Receiver
    10.
    发明申请
    Intermodulation Cancellation of Third-order Distortion in an FDD Receiver 有权
    FDD接收机三阶失真的互调取消

    公开(公告)号：US20150358047A1

    公开(公告)日：2015-12-10

    申请号：US14300290

    申请日：2014-06-10

    Applicant: Apple Inc.

    Inventor： Konstantinos Sarrigeorgidis ,  Tarik Tabet ,  Syed A. Mujtaba

    IPC: H04B1/54 ,  H04B1/12

    CPC classification number: H04B1/54 ,  H04B1/12 ,  H04B1/123 ,  H04B1/525

    Abstract: 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.

    Abstract translation: 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。

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