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Paper Abstract and Keywords
Presentation 2006-07-07 13:00
Performance comparison of LMS, RLS and QRD-RLS algorithm by FPGA Implementation
Yoshiaki Yokoyama, Hirokazu Oba (Yokohama Natl. Univ.), Minseok Kim (Brains Co.,Ltd.), Hiroyuki Arai (Yokohama Natl. Univ.) AP2006-51
Abstract (in Japanese) (See Japanese page) 
(in English) Minimum Mean Square Error(MMSE) Adaptive Array Antenna is an effective technique to achieve high-speed mobile communication system. MMSE suppresses the interference and delayed waves by steering null direction to them, and detects the desired signal by forming the main-lobe to the desired wave. There are some well-known optimization techniques to obtain the optimum weights, RLS(Recursive Least Squares) algorithm is known as fast convergence property than LMS(Least Mean Square) algorithm. However, the complexity increases in proportion to the square of the number of array elements. A systolic array processor computes the QRD-RLS algorithm based on Givens rotation using of high order of parallelism and pipeline architecture, and it can reduce the processing time needed by RLS algorithm. This report presents FPGA implementation of LMS, RLS, QRD-RLS algorithm and evaluates gate usages, convergence characteristics at actual processing time and bit dependency with fixed-point computation.
Keyword (in Japanese) (See Japanese page) 
(in English) adaptive array antenna / NLMS / RLS / QRD-RLS / RLS systolic array / FPGA implementation / /  
Reference Info. IEICE Tech. Rep., vol. 106, no. 140, AP2006-51, pp. 73-78, July 2006.
Paper # AP2006-51 
Date of Issue 2006-06-29 (AP) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee AP SAT  
Conference Date 2006-07-06 - 2006-07-07 
Place (in Japanese) (See Japanese page) 
Place (in English) Hiroshima Institute of Technology 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Satellite Communications, Antennas and Progation, etc. 
Paper Information
Registration To AP 
Conference Code 2006-07-AP-SAT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Performance comparison of LMS, RLS and QRD-RLS algorithm by FPGA Implementation 
Sub Title (in English)  
Keyword(1) adaptive array antenna  
Keyword(2) NLMS  
Keyword(3) RLS  
Keyword(4) QRD-RLS  
Keyword(5) RLS systolic array  
Keyword(6) FPGA implementation  
1st Author's Name Yoshiaki Yokoyama  
1st Author's Affiliation Yokohama National University (Yokohama Natl. Univ.)
2nd Author's Name Hirokazu Oba  
2nd Author's Affiliation Yokohama National University (Yokohama Natl. Univ.)
3rd Author's Name Minseok Kim  
3rd Author's Affiliation Brains Corporation (Brains Co.,Ltd.)
4th Author's Name Hiroyuki Arai  
4th Author's Affiliation Yokohama National University (Yokohama Natl. Univ.)
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Date Time 2006-07-07 13:00:00 
Presentation Time 25 
Registration for AP 
Paper # IEICE-AP2006-51 
Volume (vol) IEICE-106 
Number (no) no.140 
Page pp.73-78 
#Pages IEICE-6 
Date of Issue IEICE-AP-2006-06-29 

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