Authors:
Andreas Ahrens
1
and
César Benavente-Peces
2
Affiliations:
1
University of Technology, Business and Design, Germany
;
2
Universidad Politécnica de Madrid, Spain
Keyword(s):
Multiple-Input Multiple-Output System, Singular-Value Decomposition, Bit Allocation, Power Allocation, Wireless Transmission.
Related
Ontology
Subjects/Areas/Topics:
Detection, Decoding and Diversity Techniques
;
MIMO Systems and Techniques
;
Telecommunications
;
Wireless Information Networks and Systems
Abstract:
Existing bit loading and transmit power allocation techniques are often optimized for maintaining both a fixed transmit power and a fixed target bit-error rate while attempting to maximize the overall data-rate. However, delay-critical real-time interactive applications, such as voice or video transmission, may require a fixed data rate. For these fixed-rate applications it is desirable to design algorithms, which minimize the bit-error rate (BER) at a given fixed data rate. Since the capacity of multiple-input multiple-output (MIMO) systems increases linearly with the minimum number of antennas at both, the transmitter as well as the receiver side, MIMO schemes have attracted a lot of attention. However, non-frequency selective MIMO links have reached a state of maturity. By contrast, frequency selective MIMO links require substantial further research, leading in this contribution to a joint optimization of the number of activated MIMO layers and the number of bits per symbol along
with the appropriate allocation of the transmit power under the constraint of a given fixed data throughput. Our results show that in order to achieve the best possible bit-error rate, not necessarily allMIMO layers have to be activated.
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