Ranging and distance based spectrum selection in cognitive radio
AssigneeQUALCOMM Incorporated
InventorNagendra Nagaraja
Life of this patent
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Abstract
A method and apparatus for performing spectral allocation for a wireless link in a wireless communication system is disclosed. The method determines a distance/range for the wireless link and assigns an optimal sub-carrier frequency to the wireless link based on (1) a higher frequency to lower frequency priority and (2) on the value of the distance/range of the wireless link and (3) on the presence or absence of a primary user in a spectrum of the wireless link. Higher frequency sub-carriers are assigned to wireless links that have a shorter distance/range and lower frequency sub-carriers are assigned to wireless links that have a longer distance/range. The method of the present work increases the spectral efficiency of the wireless communication system and improves system bandwidth.
Claims20
A method for performing spectral allocation for a wireless link in a wireless communication system wherein the method comprises the steps of:
- determining a distance for the wireless link;
- assigning a sub-carrier to the wireless link based on a value of the distance of the wireless link and according to a rule that requires sub-carrier assignment based on a higher frequency to lower frequency assignment priority;
- determining whether a primary user is present in a spectrum of the wireless link;
- and
- occupying the spectrum with the assigned sub-carrier when there is no primary user present in the spectrum.
A method for performing spectral allocation for a wireless link in a wireless communication system wherein the method comprises the steps of:
- determining a distance for the wireless link;
- classifying a plurality of sub-carriers as low frequency or high frequency sub-carriers based on the distance of the wireless link;
- assigning one of the plurality of sub-carriers to the wireless link based on Channel Impulse Response (CIR) information;
- determining whether a primary user is present in a spectrum of the wireless link;
- and
- occupying the spectrum with the assigned sub-carrier when there is no primary user present in the spectrum.
An apparatus for performing spectral allocation for a wireless link in a wireless communication system wherein the apparatus comprises:
- means for determining a distance for the wireless link;
- means for assigning a sub-carrier to the wireless link based on a value of the distance of the wireless link and according to a rule that requires sub-carrier assignment based on a higher frequency to lower frequency assignment priority;
- means for determining whether a primary user is present in a spectrum of the wireless link;
- and
- means for occupying the spectrum with the assigned sub-carrier when there is no primary user present in the spectrum.
A computer program product for performing spectral allocation for a wireless link in a wireless communication system comprising:
- a computer-readable medium comprising:
- code for causing at least one data processor to determine a distance for the wireless link;
- code for causing the at least one data processor to assign a sub-carrier to the wireless link based on a value of the distance of the wireless link and according to a rule that requires sub-carrier assignment based on a higher frequency to lower frequency assignment priority;
- code for at least one data processor to determine whether a primary user is present in a spectrum of the wireless link;
- and
- code for causing at least one data processor to occupy the spectrum with the assigned sub-carrier when there is no primary user present in the spectrum.
Dependencies are inferred from the claim text.