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Paper Abstract and Keywords
Presentation 2004-06-18 10:05
On selection of OVSF codes for MC-CDMA downlinks
Takamichi Inoue, Garg Deepshikha, Fumiyuki Adachi (Tohoku Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) In MC-CDMA downlink, orthogonal variable spreading factor (OVSF) codes can be used to allow multirate communications while maintaining the orthogonality among the users with different data rates. In this paper, we point out that simple selection of the OVSF codes results in degraded performance. We show that this happens because simple code selection results in power concentration over certain consecutive subcarriers; severe power loss in the received signal occurs when these subcarriers experience a deep fade in a frequency selective fading channel. In addition, we show two effective techniques to avoid the performance degradation: random code selection and frequency interleaving; which technique provides a better performance depends on modulation levels, code multiplexing order, and presence of channel coding.
Keyword (in Japanese) (See Japanese page) 
(in English) MC-CDMA / MMSE frequency-domain equalization / OVSF code / frequency-selective fading / frequency interleaving / / /  
Reference Info. IEICE Tech. Rep., vol. 104, no. 123, RCS2004-78, pp. 13-18, June 2004.
Paper # RCS2004-78 
Date of Issue 2004-06-11 (RCS) 
ISSN Print edition: ISSN 0913-5685
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Conference Information
Committee RCS  
Conference Date 2004-06-17 - 2004-06-18 
Place (in Japanese) (See Japanese page) 
Place (in English) Tohoku University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Error correction, MAC, Wireless communication systems, etc. 
Paper Information
Registration To RCS 
Conference Code 2004-06-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) On selection of OVSF codes for MC-CDMA downlinks 
Sub Title (in English)  
Keyword(1) MC-CDMA  
Keyword(2) MMSE frequency-domain equalization  
Keyword(3) OVSF code  
Keyword(4) frequency-selective fading  
Keyword(5) frequency interleaving  
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Keyword(7)  
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1st Author's Name Takamichi Inoue  
1st Author's Affiliation Tohoku University (Tohoku Univ.)
2nd Author's Name Garg Deepshikha  
2nd Author's Affiliation Tohoku University (Tohoku Univ.)
3rd Author's Name Fumiyuki Adachi  
3rd Author's Affiliation Tohoku University (Tohoku Univ.)
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Speaker Author-1 
Date Time 2004-06-18 10:05:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2004-78 
Volume (vol) vol.104 
Number (no) no.123 
Page pp.13-18 
#Pages
Date of Issue 2004-06-11 (RCS) 


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