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Systems and methods for detecting the presence of a transmission signal in a wireless channel

A technology for transmitting signals and signals, which is applied in the field of detecting the existence of transmission signals and can solve problems such as undetected transmissions

Active Publication Date: 2009-09-16
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Devices within these systems may scan the spectrum of these channels in order to identify unused spectrum, however, certain types of transmissions using a spectrum may not be detected

Method used

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  • Systems and methods for detecting the presence of a transmission signal in a wireless channel
  • Systems and methods for detecting the presence of a transmission signal in a wireless channel
  • Systems and methods for detecting the presence of a transmission signal in a wireless channel

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Embodiment Construction

[0024] figure 1 A network configuration 100 according to one example of the present systems and methods is illustrated. Configuration 100 includes a plurality of base stations 110, 112, 114, 116, 118 and a plurality of user devices 108A through 108K. User devices 108A-108K may be cognitive radio devices, wireless devices, mobile stations, and the like. Configuration 100 also includes a plurality of service areas 150 , 152 , 154 , 156 , 158 . The first service area 150 includes a first base station 110 and a plurality of user equipments 108A to 108K. The first service area 150 may overlap with the second service area 152 , the third service area 154 , the fourth service area 156 , and the fifth service area 158 . As shown, some user devices may be located in service areas that are overlapped by different service areas.

[0025] A plurality of base stations 110, 112, 114, 116, 118 may provide services to user devices located in their respective service areas. For example, ...

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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 comparedto a threshold. The presence of the transmission signal is detected, if the value of the averaged periodogram exceeds the threshold.

Description

[0001] Related applications [0002] This application relates to a patent application entitled "METHOD AND APPARATUS FOR SPECTRUM SENSING" filed on November 10, 2006 by inventor Stephen J. Shellhammer (Stephen J. Shellhammer) FOR WIRELESS COMMUNICATION), which is incorporated herein by reference. technical field [0003] The present invention relates generally to communications and techniques related to wireless communications. More specifically, the present invention relates to systems and methods for detecting the presence of transmission signals in wireless channels. Background technique [0004] Wireless communication networks are widely deployed to provide various types of services such as voice, packet data, broadcast, and so on. These wireless networks include, for example, Code Division Multiple Access 2000 (CDMA2000) networks, Global System for Mobile Communications (GSM) networks, Wideband Code Division Multiple Access (W-CDMA) networks and Worldwide Interoperab...

Claims

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Application Information

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IPC IPC(8): H04B1/46
CPCH04B1/46H04W24/00H04W4/18H04B7/155
Inventor 斯蒂芬·J·谢尔哈默
Owner QUALCOMM INC
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