Title :
Adaptation between codebook based SU-MIMO and MU-MIMO with single MCS feedback in LTE
Author :
Du, Shaofeng ; Wang, Yafeng ; Zhang, Yong ; Dacheng, Yang
Author_Institution :
Wireless Theor. & Technol. (WT&T) Lab., Beijing Univ. of Posts & Telecommun., Beijing, China
Abstract :
This paper utilizes an adaptive modulation and coding (AMC) scheme and compares the performance of adaptation between single-user multiple input multiple output (SU-MIMO) and multi-user (MU) MIMO with that of SU-MIMO. In long term evolution (LTE), every UE only needs to feed back SU-MIMO rank 1 channel quality indicator (CQI) which could get feedback overhead and computational complexity reduction. This CQI message contains a specific MCS index predicted by the UE. In this AMC scheme, MU-MIMO modulation and coding scheme (MCS) of a user equipment (UE) can be obtained from its SU-MIMO rank 1 (single stream transmission) MCS. According to the SU-MIMO rank 1 MCS and MU-MIMO MCS obtained, we can achieve adaptation between SU-MIMO and MU-MIMO by two-user orthogonal pairing and proportional fair (PF) scheduling. Simulation results show that the adaptation can achieve significant improvement on spectrum efficiency (SE) compared with SU-MIMO by means of the AMC scheme proposed in this paper.
Keywords :
Long Term Evolution; MIMO communication; adaptive codes; adaptive modulation; feedback; wireless channels; AMC; CQI; LTE; MCS; MIMO; adaptive coding; adaptive modulation; channel quality indicator; codebook; feedback; long term evolution; modulation and coding scheme; multiple input multiple output; user equipment; Adaptation model; Adaptive arrays; Downlink; Interference; MIMO; Signal to noise ratio; Transmitting antennas; Adaptation; LTE; MCS; MU-MIMO; PF; precoding;
Conference_Titel :
Broadband Network and Multimedia Technology (IC-BNMT), 2010 3rd IEEE International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-6769-3
DOI :
10.1109/ICBNMT.2010.5705158
