Title :
An Efficient CQI Feedback Scheme for Multi-user and Single-User MIMO/OFDMA Systems
Author :
Cho, Myeon-gyun ; Kim, Shik
Author_Institution :
Inf. & Commun. Dept., Semyung Univ., Jecheon
Abstract :
An opportunistic scheduling is adopted to improve the capacity of the system by exploiting the multi-user diversity (MUDiv) of multi-user MIMO (MU-MIMO) systems. However, it requires a large amount of feedback carrying the channel quality information (CQI) of each user to the transmitter. The considered per user unitary and rate control (PU2RC) needs to feedback the preferred precoding index and its CQIs, and it has a defect in scheduling the streams using user grouping. In order to overcome these drawbacks, a novel feedback reduction scheme is proposed and is improved for OFDMA systems which can support single-user MIMO (SU-MIMO) and multi-user MIMO (MU-MIMO) effectively. It employs transmitter controlled precoding and opportunistic feedback (TCP-OFB) in conjunction with frequency scheduling and single/multi-user allocation.
Keywords :
MIMO communication; OFDM modulation; channel allocation; channel capacity; channel coding; diversity reception; feedback; frequency division multiple access; multiuser channels; precoding; scheduling; CQI feedback scheme; OFDMA; channel allocation; channel capacity; channel quality information; frequency scheduling; multiuser MIMO system; multiuser diversity; opportunistic scheduling; precoding index; single-user MIMO system; user grouping; Computer networks; Feedback; MIMO; Mobile communication; Mobile computing; Optimized production technology; Processor scheduling; Radio control; Radio spectrum management; Transmitters; Feedback Scheme; MIMO; Multi-user MIMO; OFDMA; Single-user MIMO;
Conference_Titel :
Networking and Communications, 2008. WIMOB '08. IEEE International Conference on Wireless and Mobile Computing,
Conference_Location :
Avignon
Print_ISBN :
978-0-7695-3393-3
Electronic_ISBN :
978-0-7695-3393-3
DOI :
10.1109/WiMob.2008.108
