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1. 发明授权

US06983127B1 Statistical calibration of wireless base stations 失效
标题翻译：无线基站的统计校准
公开(公告)号：US06983127B1
公开(公告)日：2006-01-03
申请号：US10209500
申请日：2002-07-31
申请人： Serge Barbosa Da Torre , David M. Parish , Athos Kasapi , Erik D. Lindskog , Mitchell D. Trott , Adam B. Kerr
发明人： Serge Barbosa Da Torre , David M. Parish , Athos Kasapi , Erik D. Lindskog , Mitchell D. Trott , Adam B. Kerr
IPC分类号： H04B17/00
CPC分类号： H04B17/20 , H04B7/04 , H04B7/0634 , H04B17/10
摘要： The present invention allows a radio receiver or a transmitter, with a plurality of antennas configured into an array, to be calibrated. In one embodiment, the method includes receiving a plurality of signals from a plurality of remote transmitters at the antenna array, sampling the signals received at at least two antennas of the array, computing a relative phase and amplitude of the sampled signals for each antenna, and computing calibration coefficients based on the relative phase and amplitude for the plurality of sampled signals from the plurality of remote transmitters for each antenna.
摘要翻译：本发明允许校准具有配置成阵列的多个天线的无线电接收机或发射机。在一个实施例中，该方法包括从天线阵列处的多个远程发射机接收多个信号，对在阵列的至少两个天线处接收的信号进行采样，计算每个天线的采样信号的相对相位和幅度，以及基于每个天线的来自多个远程发射机的多个采样信号的相对相位和幅度来计算校准系数。

2. 发明授权

US08675744B1 Channel tracking in an orthogonal frequency-division multiplexing system 有权
标题翻译：正交频分复用系统中的信道跟踪
公开(公告)号：US08675744B1
公开(公告)日：2014-03-18
申请号：US12237350
申请日：2008-09-24
申请人： Athos Kasapi , Sriram Sundararajan
发明人： Athos Kasapi , Sriram Sundararajan
IPC分类号： H04K1/10
CPC分类号： H04L27/066 , H04K1/10 , H04L27/2657 , H04L27/2666 , H04L27/2675 , H04L27/2676
摘要： A receiver determines phase and frequency information from data signals that carry information from a transmitter to a receiver, instead of or in addition to, information from control signals. In a specific embodiment, the information is obtained from data signals modulated as a binary phase-shift keying (“BPSK”) waveform by demodulation. Other phase-shift keyings might be used instead. Encoded information might be recovered in received OFDM packets by receiving OFDM subcarriers modulated with the two low data rates supported by IEEE 802.11 standard(s) wherein the subcarriers encoding the packet are modulated using binary phase shift keying and the encoding information is at a zero phase or a π (pi) phase offset on each of the subcarriers. Determining the carrier frequency might be done by calculating the square of each of subcarrier signal and/or determining the phase offset of the subcarriers even with information modulated onto the subcarriers.
摘要翻译：接收机从来自控制信号的信息中确定来自数据信号的相位和频率信息，该数据信号将信息从发送器传送到接收器，而不是附加信息。在具体实施例中，从通过解调作为二进制相移键控（“BPSK”）波形调制的数据信号获得信息。可以使用其他相移键控。编码的信息可以通过接收用IEEE 802.11标准支持的两个低数据速率调制的OFDM子载波来在接收的OFDM分组中恢复，其中使用二进制相移键控对编码分组的子载波进行调制，并且编码信息处于零相位或每个子载波上的pi（pi）相位偏移。确定载波频率可以通过计算每个副载波信号的平方和/或即使在被调制到子载波上的信息也可以确定子载波的相位偏移来完成。

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