Authors:
Sebastian Aust
1
;
Andreas Ahrens
1
and
César Benavente-Peces
2
Affiliations:
1
Hochschule Wismar, University of Technology and Business and Design, Germany
;
2
Universidad Politécnica de Madrid, Spain
Keyword(s):
Multiple-Input Multiple-Output System, Orthogonal Frequency Division Multiplexing, Singular-Value Decomposition, Bit Allocation, Power Allocation, Wireless Transmission.
Related
Ontology
Subjects/Areas/Topics:
MIMO Systems and Techniques
;
OFDM and Multi-Carrier Systems
;
Telecommunications
;
Wireless Information Networks and Systems
Abstract:
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 (orthogonal frequency division multiplexing) 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 int
o consideration in this contribution. The performed joint optimization of the number of activated MIMO layers and the number of transmitted bits per subcarrier along with the appropriate allocation of the transmit power 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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