TY - GEN
T1 - Flexible multi-user MIMO with limited feedback
AU - Zhou, Yongxing
AU - Clerckx, Bruno
AU - Kim, Sungjin
PY - 2009
Y1 - 2009
N2 - In a Multi-User MIMO (MU-MIMO) spatial multiplexing scheme, multiple users are scheduled in the same resource block (RB). However, due to the wide fluctuation of realistic traffic patterns, it could often occur that only a single or few users have active data that need to be sent. In 3GPP Long Term Evolution (LTE), Single-User MIMO (SU-MIMO) rank one precoding based Channel Quality Indicator (CQI) reporting mechanism is reused for MU-MIMO. This is optimum for MUMIMO if single user is served. Based on SU-MIMO Rank one reporting, CQI re-calculations at the Basestation (BS) are derived for Space Division Multiple Access (SDMA) mode and Zero-Forcing (ZF) mode respectively. A novel flexible MU-MIMO scheme with rank and mode adaptation is thus proposed for the first time with this limited feedback information. Simulation examples are provided to confirm the advantage of proposed flexible MU-MIMO scheme over SU-MIMO with 3GPP LTE framework.
AB - In a Multi-User MIMO (MU-MIMO) spatial multiplexing scheme, multiple users are scheduled in the same resource block (RB). However, due to the wide fluctuation of realistic traffic patterns, it could often occur that only a single or few users have active data that need to be sent. In 3GPP Long Term Evolution (LTE), Single-User MIMO (SU-MIMO) rank one precoding based Channel Quality Indicator (CQI) reporting mechanism is reused for MU-MIMO. This is optimum for MUMIMO if single user is served. Based on SU-MIMO Rank one reporting, CQI re-calculations at the Basestation (BS) are derived for Space Division Multiple Access (SDMA) mode and Zero-Forcing (ZF) mode respectively. A novel flexible MU-MIMO scheme with rank and mode adaptation is thus proposed for the first time with this limited feedback information. Simulation examples are provided to confirm the advantage of proposed flexible MU-MIMO scheme over SU-MIMO with 3GPP LTE framework.
KW - Beamforming
KW - Channel quality indicator (CQI) re-calculation
KW - Limited feedback
KW - MUMIMO
KW - Multiple-input multiple-output (MIMO)
KW - SDMA
KW - ZF
UR - http://www.scopus.com/inward/record.url?scp=70349705885&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=70349705885&partnerID=8YFLogxK
U2 - 10.1109/VETECS.2009.5073563
DO - 10.1109/VETECS.2009.5073563
M3 - Conference contribution
AN - SCOPUS:70349705885
SN - 9781424425174
T3 - IEEE Vehicular Technology Conference
BT - VTC Spring 2009 - IEEE 69th Vehicular Technology Conference
T2 - VTC Spring 2009 - IEEE 69th Vehicular Technology Conference
Y2 - 26 April 2009 through 29 April 2009
ER -