Title :
Space frequency codes from spherical codes
Author_Institution :
MCI, Fraunhofer German-Sino Lab for Mobile Commun., Berlin
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
Keywords :
OFDM modulation; radio networks; space-time codes; CDMA systems; MIMO-OFDM systems; decoding algorithm; differential geometric connection; optimal sequence design; space frequency codes; space time codes; spherical codes; Design methodology; Fading; Frequency diversity; Lattices; MIMO; Maximum likelihood decoding; Mobile communication; Multiaccess communication; OFDM; Space time codes;
Conference_Titel :
Information Theory, 2005. ISIT 2005. Proceedings. International Symposium on
Conference_Location :
Adelaide, SA
Print_ISBN :
0-7803-9151-9
DOI :
10.1109/ISIT.2005.1523553
