Title :
Space-Time-Frequency Spreading and Coding for Multi-User MIMO-OFDM Systems
Author :
Dahman, Haysam ; Shayan, Y. ; Wang, X.
Author_Institution :
Dept. of Electr. Eng., Concordia Univ., Montreal, QC
Abstract :
In this paper, we propose a multiple input multiple output, orthogonal frequency division multiplexing, code-division multiple-access (MIMO OFDM-CDMA) scheme. The main objective is to provide extra flexibility in user multiplexing, and offer better diversity/multi-user-multiplexing tradeoff. This is done by spreading on all the signal domains; i.e, space-time-frequency spreading is employed to transmit users´ signals. Our study and simulation results show that MIMO OFDM-CDMA is capable of flexible data rates and easy user multiplexing, while simultaneously suppressing the multi-user interfering signals. In addition, our scheme achieve a diversity gain significantly larger than that of the conventional 2-D CDMA OFDM scheme.
Keywords :
MIMO communication; OFDM modulation; code division multiple access; code division multiplexing; code division multiple access; coding; multiple input multiple output; multiuser MIMO-OFDM system; multiuser interfering signal; orthogonal frequency division multiplexing; space time frequency spreading; user multiplexing; Diversity methods; Downlink; Fading; Frequency diversity; Frequency domain analysis; MIMO; Multiaccess communication; OFDM; Sociotechnical systems; Wireless communication;
Conference_Titel :
Communications, 2008. ICC '08. IEEE International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-2075-9
Electronic_ISBN :
978-1-4244-2075-9
DOI :
10.1109/ICC.2008.851
