Peak power reduction in MIMO OFDM via active channel extension
Woo, G.R.
Jones, D.L.
Electr. & Comput. Eng., Illinois Univ., Champaign, IL, USA;
This paper appears in: Communications, 2005. ICC 2005. 2005 IEEE International Conference on
Publication Date: 16-20 May 2005
Volume: 4,
On page(s): 2636- 2639 Vol. 4
ISBN: 0-7803-8938-7
INSPEC Accession Number: 8652366
Digital Object Identifier: 10.1109/ICC.2005.1494827
Current Version Published: 2005-08-15
Abstract
High peak to average power ratio (PAR), a major drawback in single-input-single-output (SISO) systems using orthogonal frequency division multiplexing (OFDM), has already found many methods of reduction. The active channel extension (ACE) method reduces analog PAR by as much as 3.5 dB with no reduction in data rate by altering constellation points. We present an extension of this original method for PAR reduction for multi-input-multi-output (MIMO) systems in general. This new scheme, compatible with variable power allocation, minimizes PAR on each antenna in a similar manner as in the SISO system. It also supports any number of unique constellations and number of antennas by moving outer constellation points appropriately depending on the constellation for the particular channel and antenna. Simulations with 4 antennas at both transmitter and receiver show analog peak reductions of more than 3 dB overall for all 4 antennas.
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