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Paper Abstract and Keywords
Presentation 2005-10-21 09:00
A Study on Downlink Transmit Diversity Using Block Weight in TDD/MC-CDMA
Junichi Sato, Yoshinobu Kajikawa, Yasuo Nomura (Kansai Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) This paper proposes a novel transmit diversity system at down-link in TDD/MC-CDMA. In the conventional MC-CDMA transmit diversity system, the orthogonality of the spread code is lost and then the BER performance deteriorates in downlink because the data symbols of multiple users are multiplexed by adding the different weights for each subcarrier from many antennas. The proposed system therefore considers transmit weighting and multiplexing schemes based on careful study of the orthogonality of spreading code. In the proposed scheme, loss of the orthogonality of spread code can be prevented and the transmission performance can be improved by dividing the spreading code into some blocks according to the transmission channel environment and adding the same weight. Moreover, many data symbols can be transmitted simultaneously by increasing the number of divisions of spreading code, and the transmission efficiency can be consequently improved. Simulation results demonstrate that the proposed scheme can improve the BER performance and the transmission efficiency.
Keyword (in Japanese) (See Japanese page) 
(in English) MC-CDMA / Transmit Diversity / Frequency Selective Fading / / / / /  
Reference Info. IEICE Tech. Rep., vol. 105, no. 356, RCS2005-96, pp. 67-72, Oct. 2005.
Paper # RCS2005-96 
Date of Issue 2005-10-13 (RCS) 
ISSN Print edition: ISSN 0913-5685
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Conference Information
Committee AP RCS  
Conference Date 2005-10-20 - 2005-10-21 
Place (in Japanese) (See Japanese page) 
Place (in English) Akita Prefectural Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Adaptive Antenna, MIMO, RF Signal Processing etc. 
Paper Information
Registration To RCS 
Conference Code 2005-10-AP-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study on Downlink Transmit Diversity Using Block Weight in TDD/MC-CDMA 
Sub Title (in English)  
Keyword(1) MC-CDMA  
Keyword(2) Transmit Diversity  
Keyword(3) Frequency Selective Fading  
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1st Author's Name Junichi Sato  
1st Author's Affiliation Kansai University (Kansai Univ.)
2nd Author's Name Yoshinobu Kajikawa  
2nd Author's Affiliation Kansai University (Kansai Univ.)
3rd Author's Name Yasuo Nomura  
3rd Author's Affiliation Kansai University (Kansai Univ.)
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Speaker Author-1 
Date Time 2005-10-21 09:00:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2005-96 
Volume (vol) vol.105 
Number (no) no.356 
Page pp.67-72 
#Pages
Date of Issue 2005-10-13 (RCS) 


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