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Paper Abstract and Keywords
Presentation 2017-09-08 13:55
Overloaded MIMO System with Orthogonal Codes
Kei Nakahara, Yukitoshi Sanada (Keio Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) This paper presents an overloaded multiple-input multiple-output (MIMO)-orthogonal frequency division multiplexing (OFDM) scheme that realizes signal separation among terminals by orthogonal codes. In multi-user MIMO systems, block diagonalization has been well investigated. However, the calculation of weight coefficients requires the channel state information (CSI) of all the terminals. The accurate CSI feedback needs a large amount of frequency resources. In addition, if the channel correlation between the terminals is high, nulls cannot be formed at the same time. Thus, this paper proposes an overloaded MIMO-OFDM scheme with orthogonal codes that separates signals for different terminals without the CSI. The proposed scheme realizes orthogonality among the signals for the terminals while throughput reduction by spreading is compensated through with an overloaded MIMO technique. Numerical results obtained through computer simulation show that the proposed scheme achieves better bit error rate performance as compared to that of MU-MIMO on a Rayleigh fading channel when the number of users is two and each user has two receive antennas.
Keyword (in Japanese) (See Japanese page) 
(in English) Overloaded MIMO / Code Division Multiple Access / Orthogonal Code / / / / /  
Reference Info. ITE Tech. Rep., vol. 41, no. 30, BCT2017-75, pp. 9-12, Sept. 2017.
Paper # BCT2017-75 
Date of Issue 2017-09-01 (BCT) 
ISSN Print edition: ISSN 1342-6893    Online edition: ISSN 2424-1970
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Conference Information
Conference Date 2017-09-08 - 2017-09-08 
Place (in Japanese) (See Japanese page) 
Place (in English) Kochi City Culture-plaza 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Service Integration Broadcasting and Communication Systems, etc 
Paper Information
Registration To BCT 
Conference Code 2017-09-BCT-BT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Overloaded MIMO System with Orthogonal Codes 
Sub Title (in English)  
Keyword(1) Overloaded MIMO  
Keyword(2) Code Division Multiple Access  
Keyword(3) Orthogonal Code  
1st Author's Name Kei Nakahara  
1st Author's Affiliation Keio University (Keio Univ.)
2nd Author's Name Yukitoshi Sanada  
2nd Author's Affiliation Keio University (Keio Univ.)
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Speaker Author-1 
Date Time 2017-09-08 13:55:00 
Presentation Time 25 minutes 
Registration for BCT 
Paper # BCT2017-75 
Volume (vol) vol.41 
Number (no) no.30 
Page pp.9-12 
Date of Issue 2017-09-01 (BCT) 

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