Loading patent…
AssigneeQUALCOMM Incorporated
InventorsAshok Mantravadi, Krishna Kiran Mukkavilli, Raghuraman Krishnamoorthi, Rajeev Krishnamurthi
Estimating the term…
An adaptive thresholding technique eliminates suboptimum threshold values by adjusting for varying channel conditions to eliminate interference where no channel energy is present, without discarding viable taps having useful channel energy. The adaptive thresholding technique adaptively optimizes receive threshold values for both wide and local area channels based only on measured C/I ratios 300. Thresholds are calculated based on instantaneous C/I estimates and/or weighted average C/I estimates calculated from WID/LID energies obtained from the current superframe WIC/LIC symbols respectively. In alternate embodiments, thresholds are calculated based on instantaneous C/I estimates and/or weighted average C/I estimates calculated from WTPC and LTPC symbols for the wide and local area channels, respectively The present adaptive thresholding technique dynamically reduces the threshold as the C/I estimate increases to mitigate performance degradation due to removal of weak signal taps. There is a separate threshold for each of the 12 coding and modulation modes supported by an exemplary receiver.
A method of channel estimation in an Orthogonal Frequency Division Multiplex (OFDM) system comprising:
An Orthogonal Frequency Division Multiplex (OFDM) receiver, the receiver comprising:
An apparatus for channel estimation in an Orthogonal Frequency Division Multiplex (OFDM) system comprising:
A non-transitory computer readable medium encoded with a computer program configured to direct a processor to perform the steps comprising:
Dependencies are inferred from the claim text.