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Autocorrelation-based spectrum sensing of fm signals

A technology of correlation and autocorrelation function, applied in the field of communication, which can solve problems such as interference, inability to correctly identify available channels, leakage of adjacent channels, etc.

Inactive Publication Date: 2015-08-12
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, such spectral peak detectors will not be able to correctly identify available channels when there is strong adjacent channel interference
Strong licensed signals such as digital television (DTV) signals may introduce adjacent channel interference due to leakage into the adjacent spectrum, which may result in false positives using white space detectors operating on the basis of spectrum peak detection. )result
This false detection may eliminate otherwise available channels from being exploited by white space detectors

Method used

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  • Autocorrelation-based spectrum sensing of fm signals
  • Autocorrelation-based spectrum sensing of fm signals
  • Autocorrelation-based spectrum sensing of fm signals

Examples

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Embodiment Construction

[0018] In the following discussion, a wireless microphone with FM type modulation is used as an example of an FM transmitter device. Those skilled in the art will recognize that any type of FM transmission device may be used as a transmitter; a wireless microphone is merely a convenient example to illustrate the principles of the invention. Examples of transmitters include wireless microphones, repeaters, two-way radios, remote controls, and possibly other FM-based transmission devices.

[0019] Frequency modulation (FM) is an analog modulation method. The frequency of the sinusoidal carrier is varied according to the baseband signal. FM signal

[0020] s ( t ) = A c cos [ 2 πf c t + 2 πΔf ∫ 0 t ...

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Abstract

A method and system for detection of available a white space channel in an area of licensed transmitters includes a detector which utilizes the autocorrelation analysis of a channel in an frequency modulated (FM) band. Calculation of the autocorrelation excludes an initial set of correlation delay values such that large values of autocorrelation are removed. The remaining autocorrelation based on higher correlation delay values exposes the sinusoidal nature of an FM transmitter operating in the selected channel. White space becomes available to a user if no transmitter is detected using the autocorrelation detection method.

Description

technical field [0001] The present invention relates to communications, and more particularly to detecting channels available within licensed white-space frequency bands. Background technique [0002] More recently, the Federal Communications Commission (FCC) has approved the operation of unlicensed radio transmitters in the broadcast television spectrum in locations where licensed services do not use the broadcast television spectrum under certain restrictions. Some limits are specified in the FCC publication titled "Second Report and Order and Memorandum Opinion and Order," ET Docket No. 08-260, November 2008. The unused spectrum available for unlicensed uses, which may include television and other pre-allocated spectrum, is often referred to as "white space". A major limitation of spectrum use is that unlicensed devices that can operate in white space will need to sense licensed transmitter signals, such as licensed digital and analogue TV transmitter signals, at levels ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W72/00
CPCH04W16/10H04L27/10
Inventor 高文陈厚昕
Owner THOMSON LICENSING SA
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