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

Volume

1

fYear

2011

fDate

6-7 Jan. 2011

Firstpage

191

Lastpage

194

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Measuring Technology and Mechatronics Automation (ICMTMA), 2011 Third International Conference on

Conference_Location

Shangshai

Print_ISBN

978-1-4244-9010-3

Type

conf

DOI

10.1109/ICMTMA.2011.53

Filename

5720754