Title :
Rotated MC-Cyclic Antenna Frequency Spread: Effect of Rotations in Correlated MIMO-OFDM Systems
Author :
Yacoub, Doris Y. ; Teich, Werner G. ; Lindner, Jurgen
Author_Institution :
Dept. of Inf. Technol., Ulm Univ.
Abstract :
MIMO systems, although they offer high transmission rates and robustness against channel fading, often suffer from antenna correlations. In this paper, we investigate the effect of spreading and symbol rotation on a multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) system with correlations. A novel family of orthogonal spreading matrices multi-carrier-cyclic antenna frequency spread (MC-CAFS) - is used for spreading. These matrices make use of both the spatial and the frequency dimensions offered by MIMO-OFDM. We describe how transmit vector rotations can be applied to MC-CAFS spreading matrices. Three new rotation methods are introduced in this paper. We compare the performance of MC-CAFS (with and without rotations) with that of the unspread system and with multi-carrier-code division multiplexing (MIMO-MC-CDM), also with and without rotations
Keywords :
4G mobile communication; MIMO communication; OFDM modulation; code division multiplexing; fading; matrix algebra; mobile radio; wireless channels; MC-CAFS; MIMO-MC-CDM; channel fading; correlated MIMO-OFDM systems; multi-carrier-code division multiplexing; multi-carrier-cyclic antenna frequency spread; multiple-input multiple-output orthogonal frequency division multiplexing system; orthogonal spreading matrices; rotated MC-cyclic antenna frequency spread; transmit vector rotations; Bit error rate; Decision feedback equalizers; Frequency diversity; Frequency domain analysis; MIMO; OFDM; Receiving antennas; Sampling methods; Transmitters; Transmitting antennas;
Conference_Titel :
Signal Processing Advances in Wireless Communications, 2006. SPAWC '06. IEEE 7th Workshop on
Conference_Location :
Cannes
Print_ISBN :
0-7803-9710-X
Electronic_ISBN :
0-7803-9711-8
DOI :
10.1109/SPAWC.2006.346349
