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Method and apparatus for spectrum sensing of fm wireless microphone signals

A technology for spectrum sensing and receiving signals, applied in transmission monitoring, complex mathematical operations, digital transmission systems, etc.

Inactive Publication Date: 2012-05-02
THOMSON LICENSING SA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] These and other disadvantages and shortcomings of the prior art are addressed by the present principles, which focus on methods and apparatus for spectrum sensing of FM-based wireless microphone signals

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  • Method and apparatus for spectrum sensing of fm wireless microphone signals
  • Method and apparatus for spectrum sensing of fm wireless microphone signals
  • Method and apparatus for spectrum sensing of fm wireless microphone signals

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Embodiment Construction

[0023] A spectrum sensing approach for FM wireless microphone signals is described herein.

[0024] Autocorrelation function of FM signal

[0025] Frequency modulation is an analog modulation scheme. The frequency of the sinusoidal carrier varies according to the baseband signal. The FM signal x(t) can be described as

[0026] x ( t ) = A c cos [ 2 π f c t + 2 πΔf ∫ 0 t m ( u ) du + θ ] - - - ( 1 )

[0027] where θ is a random phase uniformly distributed over (0, 2π) and m(t) is the transmitted speech signal. It is zero mean and its...

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Abstract

Methods and apparatus for spectrum sensing for FM wireless microphone signals are provided. The spectrum sensing algorithm developed makes use of the property that the autocorrelation function of an FM signal is a sinusoidal function provided that the frequency deviation is much smaller than the carrier frequency and the correlation delay is small. Based on this property, a simple spectrum sensing algorithm for the FM signal is designed by computing the autocorrelation function of the received signal and matched filtering of the sinusoidal function. The spectrum sensor provided by this approach can reliably detect the target signals when a strong adjacent channel interference exists and the signal power is as low as -114 dBm.

Description

[0001] Cross References to Related Applications [0002] This application claims U.S. Provisional Application Serial No. 61 / 216872, filed May 22, 2009, entitled "SPECTRUM SENSING FOR TV WHITE SPACE IN NORTH AMERICA" and filed November 2, 2009, entitled "SPECTRUM SENSING FOR FM WIRELESS MICROPHONE SIGNALS", which is hereby incorporated by reference in its entirety. technical field [0003] The present principles relate to spectrum sensing of FM wireless microphone signals and systems. Background technique [0004] Cognitive Radio is proposed to implement negotiated or opportunistic spectrum sharing to improve spectrum efficiency. Recently, the Federal Communications Commission (FCC) has approved the operation of unlicensed radio transmitters under certain rules in the broadcast television spectrum at frequencies not used by licensed services (this unused TV spectrum is often referred to as "white space") . The main regulation is that white space equipment will be required ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00
CPCH04B17/007H04B17/0077H04B17/26H04B17/382G06F17/15H04B17/00H04L27/00
Inventor 陈厚昕高文
Owner THOMSON LICENSING SA