MIMO-OFDM with insufficient cyclic prefix

Author

Lim, Jong-Bu ; Choi, Chan-Ho ; Im, Gi-Hong

Author_Institution

Dept. of Electron. & Electr. Eng., Pohang Univ. of Sci. & Technol., South Korea

Volume

10

Issue

5

fYear

2006

fDate

5/1/2006 12:00:00 AM

Firstpage

356

Lastpage

358

Abstract

For orthogonal frequency division multiplexing (OFDM), cyclic prefix (CP) should be longer than the length of channel impulse response, resulting in a loss of bandwidth efficiency. In this letter, the CP reconstruction (CPR) technique is first applied to a multi-input multi-output (MIMO)-OFDM system with insufficient CP. The intercarrier interference (ICI) from multiple transmit antennas is so large for MIMO system that it can not be sufficiently suppressed with the conventional CPR procedure used in single-input single-output (SISO) system. A new minimum mean-square error (MMSE) equalization and ordering process is proposed for MIMO system to suppress the ICI during the CPR procedure. By applying the proposed CPR algorithm to MIMO-OFDM system, we can obtain both the benefits of multiplexing gain and spectral efficiency gain.

Keywords

MIMO systems; OFDM modulation; antenna arrays; equalisers; interference suppression; least mean squares methods; transmitting antennas; CPR technique; ICI suppression; MIMO-OFDM system; MMSE equalization; SISO system; cyclic prefix reconstruction; intercarrier interference; minimum mean-square error; multiple input multiple output; multiple transmit antennas; orthogonal frequency division multiplexing; single-input single-output; Bandwidth; Interference suppression; Intersymbol interference; Iterative algorithms; MIMO; OFDM; Signal processing algorithms; Signal restoration; Space technology; Transmitting antennas;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2006.1633321

Filename

1633321