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Paper Abstract and Keywords
Presentation 2013-09-27 10:15
Iterative Multiuser Joint Decoding based on Augmented Lagrangian Method
Shunsuke Horii, Tota Suko, Toshiyasu Matsushima, Shigeichi Hirasawa (Waseda Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) In this paper, we develop an iterative multiuser joint decoding of
code-division multiple-access (CDMA) signals based on a distributed
optimization algorithm.
For the joint decoding problem, decoding algorithm based on the turbo
principle is widely used.
The algorithm consists of soft-input soft-output (SISO) channel decoder
and SISO multiuser detector and it can be derived as an application of
the sum-product algorithm.
On the other hand, in the research area of error correcting codes, the
decoding algorithm based on convex optimization has been attracting
a great deal of attention.
Decoding algorithm based on linear programming (LP) has decoding error
rate which is comparable with sum-product algorithm with stronger
theoretical guarantees.
We formulate the joint decoding problem of CDMA signals as an convex
optimization problem and we present a relax form of the problem.
Moreover, we propose a distributed algorithm which efficiently solves
the relaxed optimization problem.
The proposed algorithm is based on alternating direction method of
multipliers (ADMM).
We also see the performance of the proposed decoder through numerical simulations.
Keyword (in Japanese) (See Japanese page) 
(in English) Coded CDMA / Multiuser detection / Turbo Principle / Augmented Lagrangian / ADMM / / /  
Reference Info. IEICE Tech. Rep., vol. 113, no. 228, IT2013-34, pp. 13-17, Sept. 2013.
Paper # IT2013-34 
Date of Issue 2013-09-20 (IT) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380

Conference Information
Committee IT  
Conference Date 2013-09-27 - 2013-09-27 
Place (in Japanese) (See Japanese page) 
Place (in English) Culture Resort Festone (Okinawa) 
Topics (in Japanese) (See Japanese page) 
Topics (in English) error correcting codes, general 
Paper Information
Registration To IT 
Conference Code 2013-09-IT 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Iterative Multiuser Joint Decoding based on Augmented Lagrangian Method 
Sub Title (in English)  
Keyword(1) Coded CDMA  
Keyword(2) Multiuser detection  
Keyword(3) Turbo Principle  
Keyword(4) Augmented Lagrangian  
Keyword(5) ADMM  
1st Author's Name Shunsuke Horii  
1st Author's Affiliation Waseda University (Waseda Univ.)
2nd Author's Name Tota Suko  
2nd Author's Affiliation Waseda University (Waseda Univ.)
3rd Author's Name Toshiyasu Matsushima  
3rd Author's Affiliation Waseda University (Waseda Univ.)
4th Author's Name Shigeichi Hirasawa  
4th Author's Affiliation Waseda University (Waseda Univ.)
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Date Time 2013-09-27 10:15:00 
Presentation Time 25 
Registration for IT 
Paper # IEICE-IT2013-34 
Volume (vol) IEICE-113 
Number (no) no.228 
Page pp.13-17 
#Pages IEICE-5 
Date of Issue IEICE-IT-2013-09-20 

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