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In 3rd. Generation Partnership Project (3GPP) Long Term Evolution (LTE) systems, physical uplink control channel (PUCCH) incorporate Reference Signals (RSs) for eNodeB to perform channel estimation. However the RSs in PUCCH formats 2a/2b are related to the transmitted 10th symbol in UE. As a result, the receivers can not have a priori knowledge about the transmitted RSs and perform channel estimation...
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