Channel estimation apparatus and method for adaptive channel allocation in an orthogonal frequency division multiple access system
First Claim
1. A method for defining at least one subcarrier as a subchannel, dividing a total frequency band into a plurality of subchannels, and allocating the subchannels to at least one mobile station in an Orthogonal Frequency Division Multiple Access (OFDMA) wireless communication system, the method comprising the steps of:
- receiving channel state information of the subchannels from the at least one mobile station;
comparing the received channel state information with a predetermined threshold;
determining a number of cases in which the received channel state information is greater than the predetermined threshold;
calculating an average occurrence length of the case in which the received channel state information is greater than the predetermined threshold, from the determined values separately stored for the subchannels for a predetermined period;
calculating a state hold prediction value for a next state of which a channel state information is greater than the threshold, from the calculated average occurrence length; and
calculating an estimation value for the next state from the state hold prediction value and a current channel state value.
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Accused Products
Abstract
A method and apparatus for defining at least one subcarrier as a subchannel, dividing a total frequency band into a plurality of subchannels, and allocating the subchannels to at least one mobile station in an OFDMA mobile communication system. The method includes receiving channel state information; comparing the received channel state information with a predetermined threshold, calculating an average occurrence length of a case in which the received channel state information is greater than the threshold, calculating a state hold prediction value, calculating an estimation value, sorting the calculated estimation values according to subchannels in order of their levels, and allocating subchannels according to the at least one mobile station in the sorted order.
23 Citations
22 Claims
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1. A method for defining at least one subcarrier as a subchannel, dividing a total frequency band into a plurality of subchannels, and allocating the subchannels to at least one mobile station in an Orthogonal Frequency Division Multiple Access (OFDMA) wireless communication system, the method comprising the steps of:
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receiving channel state information of the subchannels from the at least one mobile station; comparing the received channel state information with a predetermined threshold; determining a number of cases in which the received channel state information is greater than the predetermined threshold; calculating an average occurrence length of the case in which the received channel state information is greater than the predetermined threshold, from the determined values separately stored for the subchannels for a predetermined period; calculating a state hold prediction value for a next state of which a channel state information is greater than the threshold, from the calculated average occurrence length; and calculating an estimation value for the next state from the state hold prediction value and a current channel state value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for defining at least one subcarrier as a subchannel, dividing a total frequency band into a plurality of subchannels, and allocating the subchannels to at least one mobile station in an Orthogonal Frequency Division Multiple Access (OFDMA) wireless communication system, the apparatus comprising:
a subchannel allocator for comparing channel state information received from the at least one mobile station with a predetermined threshold, determining a number of cases in which the received channel state information is greater than the predetermined threshold, estimating a channel state value for a next time from the determined number of cases stored for a predetermined period, and allocating the subchannels for the at least one mobile station. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for defining at least one subcarrier as a subchannel, dividing a total frequency band into a plurality of subchannels, allocating the subchannels to at least one mobile station, and receiving transmitted data using the allocated subchannels in an Orthogonal Frequency Division Multiple Access (OFDMA) wireless communication system, the method comprising the steps of:
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comparing channel state information received from the at least one mobile station with a predetermined threshold; counting a number of cases in which the received channel state information is greater than the predetermined threshold; estimating a channel state value for a next time from the counted values stored for a predetermined period; receiving subchannel allocation information allocated for the at least one mobile station; and selecting a subchannel allocated thereto from subchannels received through the received subchannel allocation information. - View Dependent Claims (18, 19)
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20. An apparatus for defining at least one subcarrier as a subchannel, dividing a total frequency band into a plurality of subchannels, allocating the subchannels to at least one mobile station, and receiving transmitted data using the allocated subchannels in an Orthogonal Frequency Division Multiple Access (OFDMA) wireless communication system, the apparatus comprising:
a subchannel selector for comparing channel state information received from the at least one mobile station with a predetermined threshold, counting a number of cases in which the received channel state information is greater than the predetermined threshold, estimating a channel state value for a next time from the counted values stored for a predetermined period, receiving subchannel allocation information allocated for the at least one mobile station, and selecting a subchannel allocated thereto from subchannels received through the received subchannel allocation information. - View Dependent Claims (21, 22)
Specification