Title :
A Novel Downlink Adaption Scheme for TDD Type-II Relay Systems
Author :
Yuanping, Zhu ; Wenjia, Lin ; Xin, Yang
Author_Institution :
Shanghai Inst. of Microsyst. & Inf. Technol., Chinese Acad. of Sci., Shanghai, China
Abstract :
In a LTE-A relay-enhanced system, Type-II relay does not transmit CRS (Common Reference Signal), which prevents UE from estimating channel quality of relay-UE link and feeding back to eNB. Without knowledge of relay-UE link quality, eNB cannot select appropriate MCS (Modulation and Coding Scheme) for downlink transmission. In this paper, a novel downlink adaption scheme for a TDD (Time Division Duplex) relay-enhanced system is proposed. The procedure, transmit and receive algorithms of the proposed adaption scheme are also presented. Simulation results show that proposed link adaption scheme improves system spectrum efficiency significantly in various situations.
Keywords :
Long Term Evolution; channel estimation; encoding; modulation; LTE-A relay-enhanced system; TDD type-II relay systems; channel quality estimation; common reference signal; downlink adaption scheme; downlink transmission; evolved Node B; modulation and coding scheme; receive algorithms; relay-UE link; system spectrum efficiency; time division duplex; transmit algorithms; user equipment; Adaptation model; Downlink; Feeds; Joints; OFDM; Relays; Time frequency analysis; adaptive modulation and coding; link adaption; relay;
Conference_Titel :
Measuring Technology and Mechatronics Automation (ICMTMA), 2011 Third International Conference on
Conference_Location :
Shangshai
Print_ISBN :
978-1-4244-9010-3
DOI :
10.1109/ICMTMA.2011.53
