Open AccessAn Efficient Scheme to Achieve Differential Unitary Space‐Time Modulation on MIMO‐OFDM Systems
Author(s) -
Liu Shouyin,
Chong JongWha
Publication year - 2004
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.04.0804.0005
Subject(s) - unitary state , mimo , scheme (mathematics) , differential (mechanical device) , modulation (music) , computer science , orthogonal frequency division multiplexing , mimo ofdm , electronic engineering , control theory (sociology) , topology (electrical circuits) , mathematics , telecommunications , engineering , physics , channel (broadcasting) , aerospace engineering , acoustics , mathematical analysis , control (management) , combinatorics , artificial intelligence , political science , law
Differential unitary space‐time modulation (DUSTM) has emerged as a promising technique to obtain spatial diversity without intractable channel estimation. This paper presents a study of the application of DUSTM on multiple‐input multiple‐output orthogonal frequency division multiplexing (MIMO‐OFDM) systems with frequency‐selective fading channels. From the view of a correlation analysis between subcarriers of OFDM, we obtain the maximum achievable diversity of DUSTM on MIMO‐OFDM systems. Moreover, an efficient implementation strategy based on subcarrier reconstruction is proposed, which transmits all the signals of one signal matrix in one OFDM transmission and performs differential processing between two adjacent OFDM blocks. The proposed method is capable of obtaining both spatial and multipath diversity while reducing the effect of time variation of channels to a minimum. The performance improvement is confirmed by simulation results.