Precoding Scheme Robust to Imperfect CSI in Downlink Multiuser MIMO-OFDM System

2011 ◽  
Vol E94-B (12) ◽  
pp. 3515-3524 ◽  
Author(s):  
Linchen CHANG ◽  
Kazuhiko FUKAWA ◽  
Hiroshi SUZUKI ◽  
Satoshi SUYAMA
Keyword(s):  
Imperfect Csi ◽  
Ofdm System ◽  
Multiuser Mimo ◽  
Mimo Ofdm ◽  
Downlink Multiuser Mimo

scholarly journals Modulation-Mode Assignment in SVD-Aided Downlink Multiuser MIMO-OFDM Systems

2011 ◽  
Vol 57 (4) ◽  
pp. 459-464 ◽  
Author(s):  
Sebastian Aust ◽  
Andreas Ahrens ◽  
César Benavente-Peces
Keyword(s):  
Wireless Systems ◽  
Future Generations ◽  
Ofdm Systems ◽  
Multiuser Mimo ◽  
Transmission Systems ◽  
Multicarrier Transmission ◽  
Modulation Mode ◽  
Mimo Ofdm ◽  
Mode Assignment ◽  
Downlink Multiuser Mimo

Modulation-Mode Assignment in SVD-Aided Downlink Multiuser MIMO-OFDM SystemsMulticarrier transmission such as OFDM (orthogonal frequency division multiplexing) is an established technique for radio transmission systems and it can be considered as a promising approach for next generation wireless systems. However, in order to comply with the demand on increasing available data rates in particular in wireless technologies, systems with multiple transmit and receive antennas, also called MIMO (multiple-input multiple-output) systems, have become indispensable for future generations of wireless systems. Due to the strongly increasing demand in high-data rate transmission systems, frequency non-selective MIMO links have reached a state of maturity and frequency selective MIMO links are in the focus of interest. In this field, the combination of MIMO transmission and OFDM can be considered as an essential part of fulfilling the requirements of future generations of wireless systems. However, single-user scenarios have reached a state of maturity. By contrast multiple users' scenarios require substantial further research, where in comparison to ZF (zero-forcing) multiuser transmission techniques, the individual user's channel characteristics are taken into consideration in this contribution. The performed joint optimization of the number of activated MIMO layers and the number of transmitted bits per subcarrier shows that not necessarily all user-specific MIMO layers per subcarrier have to be activated in order to minimize the overall BER under the constraint of a given fixed data throughput.

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