Per-subcarrier antenna selection with power constraints in OFDM systems

In an OFDM system, antenna selection can be performed on a per-subcarrier basis, which can exploit the frequency selectivity of the channel. However, this may cause power imbalance across the antennas, which may lead to problems with the power amplifiers (PA). To avoid this problem, we devise a sche...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2009-02, Vol.8 (2), p.673-677
Main Authors: Sandell, M., Coon, J.P.
Format: Article
Language:English
Subjects:
Amplification
Antenna feeds
antenna selection
Antennas
Applied sciences
Bit error rate
Channels
Cost function
Diversity methods
Exact sciences and technology
Gain
Information, signal and communications theory
integer optimization
Integers
linear relaxation
MISO
Multiplexing
OFDM
Optimization
Optimization methods
Orthogonal Frequency Division Multiplexing
Power amplifiers
Radiocommunications
Receiving antennas
Signal and communications theory
Simulation
Telecommunications
Telecommunications and information theory
Transmitters
Transmitting antennas
Wireless communication
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Summary:In an OFDM system, antenna selection can be performed on a per-subcarrier basis, which can exploit the frequency selectivity of the channel. However, this may cause power imbalance across the antennas, which may lead to problems with the power amplifiers (PA). To avoid this problem, we devise a scheme that allocates the same number of subcarriers to all antennas, while still offering substantial diversity gains. This is achieved by using integer optimization and we show that this is solvable by linear relaxation, which results in a reduced complexity. The constrained antenna selection is analyzed and it is shown that choosing the cost function as BER offers better diversity gains than using SNR. Simulations with a nonlinear PA show that the integer optimization scheme performs better than unconstrained antenna selection and a previously published ad hoc method.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2009.080313