公开(公告)号：US20170302329A1

公开(公告)日：2017-10-19

申请号：US15483573

申请日：2017-04-10

Applicant: FEDERATED WIRELESS, INC.

Inventor： Samuel Jay Macmullan ,  Etty Lee ,  Jeff Winston ,  Rohan Grover ,  Kurt Schaubach

IPC: H04B1/69 ,  H04B1/10

CPC classification number: H04B1/69 ,  H04B1/1027 ,  H04B2001/6912

Abstract: An improved technique for detecting the presence or absence of one or more predetermined signals in a shared spectrum. In accordance with the disclosed embodiments, a received RF signal may be down-converted to a baseband signal, which is subsequently processed by a spectrum sensor to detect the presence or absence of a predetermined signal, such as a predetermined radar signal. The spectrum sensor may transform the baseband signal to the frequency domain, for example using a fast Fourier transform, to generate a corresponding set of frequency components. The spectrum sensor multiplies the frequency components of the baseband signal with the frequency response of a matched filter having a set of coefficients corresponding to the predetermined signal. The spectrum sensor may convert the matched-filter output signal to the time domain, for example using an inverse fast Fourier transform, and then may determine a value indicative of the signal power that it compares with a known threshold value. The spectrum sensor may determine the presence or absence of the predetermined signal in the received RF signal based on the result of the comparison, and may use the results of its determination to cause the reconfiguration of a transmitter that may be used to transmit RF signals in the same shared spectrum as the received RF signal.

公开(公告)号：US10128898B2

公开(公告)日：2018-11-13

申请号：US15483573

申请日：2017-04-10

Applicant: FEDERATED WIRELESS, INC.

Inventor： Samuel Jay Macmullan ,  Etty Lee ,  Jeff Winston ,  Rohan Grover ,  Kurt Schaubach

IPC: H04B1/7093 ,  H04B1/69 ,  H04B1/10

Abstract: An improved technique for detecting the presence or absence of one or more predetermined signals in a shared spectrum. In accordance with the disclosed embodiments, a received RF signal may be down-converted to a baseband signal, which is subsequently processed by a spectrum sensor to detect the presence or absence of a predetermined signal, such as a predetermined radar signal. The spectrum sensor may transform the baseband signal to the frequency domain, for example using a fast Fourier transform, to generate a corresponding set of frequency components. The spectrum sensor multiplies the frequency components of the baseband signal with the frequency response of a matched filter having a set of coefficients corresponding to the predetermined signal. The spectrum sensor may convert the matched-filter output signal to the time domain, for example using an inverse fast Fourier transform, and then may determine a value indicative of the signal power that it compares with a known threshold value. The spectrum sensor may determine the presence or absence of the predetermined signal in the received RF signal based on the result of the comparison, and may use the results of its determination to cause the reconfiguration of a transmitter that may be used to transmit RF signals in the same shared spectrum as the received RF signal.

公开(公告)号：US09647719B2

公开(公告)日：2017-05-09

申请号：US15043848

申请日：2016-02-15

Applicant: FEDERATED WIRELESS, INC.

Inventor： Samuel Jay MacMullan ,  Etty Lee ,  Jeff Winston ,  Rohan Grover ,  Kurt Schaubach

IPC: H04B1/69 ,  H04B1/10

CPC classification number: H04B1/69 ,  H04B1/1027 ,  H04B2001/6912

Abstract: An improved technique for detecting the presence or absence of one or more predetermined signals in a shared spectrum. In accordance with the disclosed embodiments, a received RF signal may be down-converted to a baseband signal, which is subsequently processed by a spectrum sensor to detect the presence or absence of a predetermined signal, such as a predetermined radar signal. The spectrum sensor may transform the baseband signal to the frequency domain, for example using a fast Fourier transform, to generate a corresponding set of frequency components. The spectrum sensor multiplies the frequency components of the baseband signal with the frequency response of a matched filter having a set of coefficients corresponding to the predetermined signal. The spectrum sensor may convert the matched-filter output signal to the time domain, for example using an inverse fast Fourier transform, and then may determine a value indicative of the signal power that it compares with a known threshold value. The spectrum sensor may determine the presence or absence of the predetermined signal in the received RF signal based on the result of the comparison, and may use the results of its determination to cause the reconfiguration of a transmitter that may be used to transmit RF signals in the same shared spectrum as the received RF signal.