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    • 1. 发明授权
    • System and method for reducing peak-to-average power ratio in orthogonal frequency division multiplexing signals using reserved spectrum
    • 使用保留频谱在正交频分复用信号中降低峰值与平均功率比的系统和方法
    • US07583583B2
    • 2009-09-01
    • US11300508
    • 2005-12-15
    • Ning GuoNeil McGowanGary Boudreau
    • Ning GuoNeil McGowanGary Boudreau
    • H04J9/00H04J11/00
    • H04L27/2618
    • A method and apparatus for reducing the peak to average power ratio of an OFDM signal. The method involves operating on the signal only after it is converted to the time domain where the signal is compared to a power threshold and any signal above the power threshold is considered undesirable. A reduced signal is produced by reducing the magnitude to the power threshold whenever it exceeds that threshold. The delta between the original signal and reduced signal is the clipped signal. The clipped signal is multiplied by a g-function, and then subtracted from the original signal to produce a first iteration of a peak-reduced signal. The process can then be repeated using the first peak-reduced signal in place of the original signal to produce the second iteration of a peak-reduced signal. This process can be repeated each time bringing the peaks closer to the power threshold. The g-function can be defined either to allow for per-symbol cyclic signal processing or non-cyclic processing that is symbol time independent.
    • 一种降低OFDM信号的峰均功率比的方法和装置。 该方法仅在将信号转换为信号与功率阈值进行比较的时域之后对信号进行操作,并且认为任何高于功率阈值的信号都是不合需要的。 通过在超过该阈值时将功率阈值的幅度减小来产生降低的信号。 原始信号和减小信号之间的差值是限幅信号。 剪切信号乘以g函数,然后从原始信号中减去,以产生峰值降低信号的第一次迭代。 然后可以使用第一峰值降低信号代替原始信号来重复该过程,以产生峰值降低信号的第二次迭代。 每次使峰值更接近功率阈值时,可以重复该过程。 g函数可以被定义为允许符号时间无关的每符号循环信号处理或非循环处理。
    • 2. 发明申请
    • System and method for reducing peak-to-average power ratio in orthogonal frequency division multiplexing signals using reserved spectrum
    • 使用保留频谱在正交频分复用信号中降低峰值与平均功率比的系统和方法
    • US20070140101A1
    • 2007-06-21
    • US11300508
    • 2005-12-15
    • Ning GuoNeil McGowanGary Boudreau
    • Ning GuoNeil McGowanGary Boudreau
    • H04J9/00H04J11/00
    • H04L27/2618
    • A method and apparatus for reducing the peak to average power ratio of an OFDM signal. The method involves operating on the signal only after it is converted to the time domain where the signal is compared to a power threshold and any signal above the power threshold is considered undesirable. A reduced signal is produced by reducing the magnitude to the power threshold whenever it exceeds that threshold. The delta between the original signal and reduced signal is the clipped signal. The clipped signal is multiplied by a g-function, and then subtracted from the original signal to produce a first iteration of a peak-reduced signal. The process can then be repeated using the first peak-reduced signal in place of the original signal to produce the second iteration of a peak-reduced signal. This process can be repeated each time bringing the peaks closer to the power threshold. The g-function can be defined either to allow for per-symbol cyclic signal processing or non-cyclic processing that is symbol time independent.
    • 一种降低OFDM信号的峰均功率比的方法和装置。 该方法仅在将信号转换为信号与功率阈值进行比较的时域之后对信号进行操作,并且认为任何高于功率阈值的信号都是不合需要的。 通过在超过该阈值时将功率阈值的幅度减小来产生降低的信号。 原始信号和减小信号之间的差值是限幅信号。 剪切信号乘以g函数,然后从原始信号中减去,以产生峰值降低信号的第一次迭代。 然后可以使用第一峰值降低信号代替原始信号来重复该过程,以产生峰值降低信号的第二次迭代。 每次使峰值更接近功率阈值时,可以重复该过程。 g函数可以被定义为允许符号时间无关的每符号循环信号处理或非循环处理。
    • 9. 发明授权
    • Multi-OFDM-protocol beacon operation
    • US10862723B2
    • 2020-12-08
    • US16318625
    • 2016-08-30
    • Gary BoudreauHassan HalabianRoland Smith
    • Gary BoudreauHassan HalabianRoland Smith
    • H04L27/26H04L5/00H04L27/00H04W16/14
    • Methods and systems for multi-protocol beacon operation in shared spectrum (unlicensed band) are disclosed where an OFDM transmitter is configured to generate transmissions associated with one OFDM technology or protocol using subcarriers of another OFDM technology. In one application, an LTE transmitter (LTE-U) uses LTE subcarriers to generate an interpolated 802.11 (e.g. Wi-Fi) beacon transmission that can be understood by Wi-Fi receivers, for example to reserve the channel for a subsequent LTE transmission. For instance a W-LAN preamble is generated where STF and LTF fields consist in respectively 12 and 52 subcarriers mapped at their respective frequency locations among the 2048 LTE subcarriers with the remaining subcarriers set to 0. In some implementations, the use of beacons can be useful in implementations where it is desirable to gain prioritized access to reserve the channel. Examples of suitable LTE transmissions that would benefit from prioritized channel access include delay or time-sensitive LTE transmissions or transmissions that must occur within a certain time window and/or with a certain periodicity such as LTE control data or signals (e.g. PDCCH), and/or synchronization or reference signals such as the Discovery Reference Signal (DRS) for LAA-LTE). An LTE transmitter can exploit the 802.11 channel access to gain prioritized channel access for transmitting 802.11 Wi-Fi beacons generated using its LTE subcarriers to ensure LTE transmissions take priority over other types of LTE and/or Wi-Fi traffic.
    • 10. 发明申请
    • AUTONOMOUS MAXIMUM POWER SETTING BASED ON CHANNEL FINGERPRINT
    • 基于通道指纹的自动最大功率设置
    • US20130039194A1
    • 2013-02-14
    • US13384854
    • 2011-12-28
    • Iana SiominaMuhammad KazmiGary Boudreau
    • Iana SiominaMuhammad KazmiGary Boudreau
    • H04W52/04H04W24/00
    • H04W52/244
    • A home base station (HBS) (104, 801) performs radio channel measurements to detect one or more user equipments (UEs) (107) not served by the HBS which may be in a potentially interfering environment caused at least in part by the HBS. A database (812) of historical channel data (channel fingerprinting) of the HBS coverage area is used to predict the channel conditions and expected interference signal power seen by the detected UE(s). Based on a combination of the radio measurements (813) and historical channel data, the HBS can accurately and adaptively reduce its transmit power to a level that reduces or eliminates interference with the detected UE(s), while also not significantly degrading communication quality between other UEs served by the HBS.
    • 家庭基站(HBS)(104,801)执行无线电信道测量以检测不由HBS服务的一个或多个用户设备(107),所述HBS可能至少部分地由HBS引起潜在的干扰环境 。 使用HBS覆盖区域的历史信道数据(信道指纹)的数据库(812)来预测检测到的UE看到的信道状况和预期的干扰信号功率。 基于无线电测量(813)和历史信道数据的组合,HBS可以将其发射功率精确和自适应地降低到降低或消除对所检测到的UE的干扰的水平,同时也不会显着降低 由HBS服务的其他UE。