A Novel Transmit Scheme in CDM-Based MIMO Channel Sounding Systems

Minjae KIM  Heung-Ryeol YOU  Hyuckjae LEE  

IEICE TRANSACTIONS on Communications   Vol.E93-B   No.9   pp.2428-2432
Publication Date: 2010/09/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.2428
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Transmission Systems and Transmission Equipment for Communications
MIMO channel sounding,  loosely synchronous sequences,  CAZAC sequences,  Kasami sequences,  chaotic sequences,  

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The code division multiplexing (CDM)-based MIMO channel sounder architecture is efficient at measuring fast fading MIMO channels. This paper examines loosely synchronous (LS), CAZAC, Kasami, and Chaotic sequences as probing signals in the CDM architecture. After comparing the performance of the channel measurement among the sequences, it is concluded that the LS sequences are the most appropriate codes for the probing signals. However, because LS sequences have a significant drawback in that the number of transmit antennas is limited to less than 4, we propose using a hybrid architecture combining CDM with TDM for supporting a greater number of transmit antennas. The simulation results show that the proposed scheme can improve the measurement performance when more than 4 transmit antennas are used.