Title :
Channel Selection HARQ Feedback in LTE-Advanced
Author :
Berggren, Fredrik ; Liu, Jianghua
Author_Institution :
Huawei Technol. Sweden AB, Kista, Sweden
Abstract :
LTE-Advanced supports carrier aggregation which implies that ACK/NACK information bits for multiple downlink carriers are fed back in the uplink. One method for HARQ feedback with multiple ACK/NACK bits is channel selection, wherein ACK/NACK information is encoded by the joint selection of a channel (transmit sequence) and a QPSK symbol. We give a signal design for mapping ACK/NACK information to the channels and modulation symbols, in order to minimize and equalize the ACK-to-NACK and NACK-to-ACK error probabilities. It is shown how the performance depends on the set of channels assigned to a given ACK/NACK bit.
Keywords :
Long Term Evolution; automatic repeat request; encoding; error statistics; quadrature phase shift keying; ACK-to-NACK error probability; ACK/NACK information bits; LTE-advanced; Long Term Evolution; NACK-to-ACK error probability; QPSK symbol; carrier aggregation; channel selection HARQ feedback; encoding; modulation symbols; multiple downlink carriers; Downlink; Error probability; OFDM; Phase shift keying; Signal design; Signal to noise ratio;
Conference_Titel :
Vehicular Technology Conference (VTC Spring), 2012 IEEE 75th
Conference_Location :
Yokohama
Print_ISBN :
978-1-4673-0989-9
Electronic_ISBN :
1550-2252
DOI :
10.1109/VETECS.2012.6240077
