Invention Grant
- Patent Title: Systems and methods for detecting the presence of a transmission signal in a wireless channel
- Patent Title (中): 用于检测无线信道中传输信号的存在的系统和方法
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Application No.: US11935911Application Date: 2007-11-06
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Publication No.: US08031807B2Publication Date: 2011-10-04
- Inventor: Stephen J. Shellhammer
- Applicant: Stephen J. Shellhammer
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM, Incorporated
- Current Assignee: QUALCOMM, Incorporated
- Current Assignee Address: US CA San Diego
- Agent William M. Hooks
- Main IPC: H04L27/00
- IPC: H04L27/00
Abstract:
A method for detecting the presence of a transmission signal in a wireless spectrum channel. The frequency of a signal is converted from a first frequency to a second frequency. The signal with the second frequency is filtered to remove signals that are not within the band of the second frequency. An averaged periodogram of the signal is calculated. A value of the averaged periodogram is compared to a threshold. The presence of the transmission signal is detected, if the value of the averaged periodogram exceeds the threshold.
Public/Granted literature
- US20080112467A1 SYSTEMS AND METHODS FOR DETECTING THE PRESENCE OF A TRANSMISSION SIGNAL IN A WIRELESS CHANNEL Public/Granted day:2008-05-15
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