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Optimized resource allocation of the DownLink (DL) in wireless systems utilizing Multi-Carrier (MC) transmission requires Channel State Information (CSI) feedback for each user/sub-channel to the Base Station (BS), consuming a high amount of UpLink (UL) radio resources. To alleviate this problem, several works have considered contention-based CSI feedback in the UL control channel. The authors propose such a feedback scheme for a generic MC system, based on the idea of variable collision protection, where the probability that feedback information experiences a collision depends on its importance.
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