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Title: Resource reduction method for the LTE-advanced uplink ACK/NACK signal and SR
Authors: NAKAO, Seigo
MURATA, Hidekazu  kyouindb  KAKEN_id
YAMAMOTO, Koji  kyouindb  KAKEN_id
Keywords: LTE-Advanced
space orthogonal resource transmit diversity
phase rotation
ACK/NACK signal
scheduling request
Issue Date: Jan-2011
Publisher: Institute of Electronics, Information and Communication Engineers(IEICE)
Journal title: IEICE Transactions on Communications
Volume: E94-B
Issue: 1
Start page: 364
End page: 367
Abstract: Advanced Evolved Universal Terrestrial Radio Access (Advanced E-UTRA), called LTE-Advanced, has been standardized in the 3rd Generation Partnership Project (3GPP) as a candidate for IMT-Advanced. LTE-Advanced supports spatial orthogonal-resource transmit diversity (SORTD) [1], [2] for ACK/NACK signals and scheduling requests (SRs), which are used to control downlink hybrid automatic repeat requests (HARQs) and manage uplink radio resources based on uplink data traffic, respectively. Both ACK/NACK signals and SRs are carried via a physical uplink control channel (PUCCH) [3], and a common PUCCH format is used for both ACK/NACK signals and SRs. If SORTD is used, the base station assigns mutually orthogonal resources to each antenna included in the user equipment (UE) for ACK/NACK signals and SRs; hence, the number of required resources increases with the number of transmitting antennas in the UE. In this paper, we study the resource reduction method for ACK/NACK signal and SR in case of SORTD using the concept of common resource. In addition, we investigate a phase rotation scheme for common resources to improve the SR detection performance.
Rights: © 2011 The Institute of Electronics, Information and Communication Engineers
DOI(Published Version): 10.1587/transcom.E94.B.364
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