METHODS AND APPARATUS FOR SENSING THE PRESENCE OF A TRANSMISSION SIGNAL IN A WIRELESS CHANNEL
First Claim
1. A method for sensing the presence of a transmission signal type within a wireless channel in a wireless communication system, the method comprising:
- calculating a spectral density estimate of a signal on the wireless channel;
comparing a first test value derived from the calculated spectral density estimate to a first threshold;
making a preliminary determination of the presence of the transmission signal type if the first test value exceeds the first threshold; and
sensing the presence of the signal type after a preliminary determination of the presence of the signal type is made by determining that an observed spectral density of a prescribed signal added to the signal on the wireless channel matches a model estimate of the spectral density of the prescribed signal by at least a predetermined degree.
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Accused Products
Abstract
Methods and apparatus for sensing the presence of a transmission signal type within a wireless channel in a wireless communication system, such as those including the use of wireless microphones, are described. Sensing the transmission signal type includes calculating a spectral density estimate of a signal on the wireless channel. A first test value, derived from the calculated spectral density estimate, is compared to a first threshold. A preliminary determination of the presence of the transmission signal type is made if the first test value exceeds the first threshold. Sensing the presence of the signal type after preliminary determination of the presence of the signal type is made by determining that an observed spectral density of a prescribed signal added to the signal on the wireless channel matches a model estimate of the spectral density of the prescribed signal to a sufficient degree.
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Citations
36 Claims
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1. A method for sensing the presence of a transmission signal type within a wireless channel in a wireless communication system, the method comprising:
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calculating a spectral density estimate of a signal on the wireless channel; comparing a first test value derived from the calculated spectral density estimate to a first threshold; making a preliminary determination of the presence of the transmission signal type if the first test value exceeds the first threshold; and sensing the presence of the signal type after a preliminary determination of the presence of the signal type is made by determining that an observed spectral density of a prescribed signal added to the signal on the wireless channel matches a model estimate of the spectral density of the prescribed signal by at least a predetermined degree. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus operable for sensing the presence of a transmission signal type within a wireless channel in a wireless communication, the apparatus comprising:
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a memory storing instructions executable by a processor; and at least one processor configured to execute the instructions stored in the memory to; calculate a spectral density estimate of a signal on the wireless channel; compare a first test value derived from the calculated spectral density estimate to a first threshold, and make a preliminary determination of the presence of the transmission signal type if the first test value exceeds the first threshold; and sense the presence of the signal type after a preliminary determination of the presence of the signal type is made by determining that an observed spectral density of a prescribed signal added to the signal on the wireless channel matches a model estimate of the spectral density of the prescribed signal by at least a predetermined degree. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An apparatus operable for sensing the presence of a transmission signal type within a wireless channel in a wireless communication, the apparatus comprising:
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means for calculating a spectral density estimate of a signal on the wireless channel; means for comparing a first test value derived from the calculated spectral density estimate to a first threshold, means for making a preliminary determination of the presence of the transmission signal type if the first test value exceeds the first threshold; and means for sensing the presence of the signal type after a preliminary determination of the presence of the signal type is made by means for determining that an observed spectral density of a prescribed signal added to the signal on the wireless channel matches a model estimate of the spectral density of the prescribed signal by at least a predetermined degree. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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28. A computer program product comprising:
computer-readable medium comprising; code for causing a computer to calculate a spectral density estimate of a signal on the wireless channel; code for causing the computer to compare a first test value derived from the calculated spectral density estimate to a first threshold; code for causing the computer to make a preliminary determination of the presence of the transmission signal type if the first test value exceeds the first threshold; and code for causing the computer to sense the presence of the signal type after a preliminary determination of the presence of the signal type is made by determining that an observed spectral density of a prescribed signal added to the signal on the wireless channel matches a model estimate of the spectral density of the prescribed signal by at least a predetermined degree. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36)
Specification