TL;DR
This paper introduces a novel design method for high-rate, fully diverse space frequency codes in MIMO-OFDM systems, leveraging spherical and space time code connections, with an efficient lattice-based decoding algorithm.
Contribution
It presents a new construction method for space frequency codes using differential geometry and lattice techniques, applicable to any number of antennas and subcarriers.
Findings
Design method achieves high data rates and full diversity.
Lattice decoding reduces computational complexity.
Applicable to arbitrary MIMO-OFDM configurations.
Abstract
A new design method for high rate, fully diverse ('spherical') space frequency codes for MIMO-OFDM systems is proposed, which works for arbitrary numbers of antennas and subcarriers. The construction exploits a differential geometric connection between spherical codes and space time codes. The former are well studied e.g. in the context of optimal sequence design in CDMA systems, while the latter serve as basic building blocks for space frequency codes. In addition a decoding algorithm with moderate complexity is presented. This is achieved by a lattice based construction of spherical codes, which permits lattice decoding algorithms and thus offers a substantial reduction of complexity.
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