Title :
An MIMO-OFDM technique for high-speed mobile channels
Author :
Park, Kyung Won ; Cho, Yong Soo
Author_Institution :
Sch. of Electr. & Electron. Eng., Chung-Ang Univ., Seoul, South Korea
fDate :
7/1/2005 12:00:00 AM
Abstract :
In this letter, a new orthogonal frequency-division multiplexing (OFDM) technique for multiple-input multiple output (MIMO) channels is proposed to reduce interchannel interference (ICI) caused by high-speed mobiles in cellular environments. After analyzing the ICI caused by high-speed mobile channels using a simple curve fitting technique, the weighting factor for group transmission is optimized. Then, a new MIMO-OFDM technique, based on the weighting factor optimization, is proposed for reducing ICI caused by time-varying channels. Performances of the proposed technique are verified by using the I-METRA channel, proposed for an MIMO channel to 3GPP, and a MIMO-OFDM simulator designed for macrocellular mobile communication. It is shown by computer simulation that the proposed MIMO-OFDM technique is effective in reducing ICI and noise as well as in obtaining diversity gain even under highly-correlated fast fading channels, compared with the conventional MIMO-OFDM schemes.
Keywords :
MIMO systems; OFDM modulation; adjacent channel interference; cellular radio; curve fitting; fading channels; interference suppression; optimisation; time-varying channels; I-METRA channel; ICI; MIMO; OFDM; curve fitting technique; high-speed mobiles; highly-correlated fast fading channels; interchannel interference; macrocellular communication; multiple-input multiple output channels; orthogonal frequency-division multiplexing; time-varying channels; weighting factor optimization; Computational modeling; Computer simulation; Curve fitting; Frequency division multiplexing; Interchannel interference; MIMO; Mobile communication; Noise reduction; OFDM; Time-varying channels;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2005.1461678
