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Carrier aggregation (CA) is introduced in Long Term Evolution-Advanced (LTE-A) to provide larger bandwidth and higher peak rate for a single user. L1 control signaling design is very critical for implementing CA, and Ack/Nack feedback for CA is particularly challenging in time division duplexing (TDD) mode due to the potential large UL/DL asymmetry and limited transmit power in UL. This paper addresses...
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