Published Papers - MIYAMOTO Shinichi

Performance of 2.4GHz-band DS-SS Wireless LAN System using Adaptive Multicode Transmission under Man-made Noise Environment

Kazuhiro Watanabe, Shinichi Miyamoto, Norihiko Morinaga

Progress In Electromagnetic Research Symposium (PIERS 2001)     601   2001.07  [Refereed]

Adaptive Multicode Transmission Technique in 2.4GHz-band DS-SS Wireless LAN System

Shinichi Miyamoto, Norihiko Morinaga

5th World Multi Conference on Systemics, Cybernetics and Informatics (SCI 2001)     IS00305-5   2001.07  [Refereed]

Performance of 2.4GHz-band DS-SS Wireless LAN System using Adaptive Multicode Transmission

Kazuhiro Watanabe, Shinichi Miyamoto, Norihiko Morinaga

11th Virginia Tech MPRG Symposium on Wireless Personal Communications     43 - 48   2001.06  [Refereed]

A Study on the Performance of 2.4 GHz Band DS-SS Wireless LAN System using Adaptive Multicode Transmission

Proceedings of the 2001 IEICE General Conference     69 - 70   2001

Multiple-beams Transmission and Multiple-detectors Reception for PPM/CDMA based Non-directed Diffuse Indoor Infrared Wireless Communication System

Takahiro Yamane, Shinichi Miyamoto, Kazutoshi Hirohashi, Norihiko Morinaga

Fifth Optoelectronics and Communications Conference (OECC 2000)     238 - 239   2000.07  [Refereed]

EMI suppression technique for ISM-band WLANs using multicode transmission and EMI observation channel

S Unawong, S Miyamoto, N Morinaga

IEICE TRANSACTIONS ON COMMUNICATIONS ( IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG )  E83B ( 3 ) 532 - 540   2000.03  [Refereed]

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It is well known that the electromagnetic interference (EMI) radiated from industrial, scientific and medical (ISM) apparatus seriously degrades the performance of wireless communication systems. In this paper, an ISM-band wireless local area network (WLAN) which employs a direct sequence spread spectrum (DS-SS) system is designed to be sufficiently robust and reliable to operate in the presence of this EMI. To satisfy this goal, a technique to suppress EMI in the DS-SS system using a multicode transmission and an EMI observation channel is proposed. In the study, thf EMI radiated from switching-type microwave ovens (MWO interference) which are ISM apparatus is concerned, and for a tractable investigation, a statistical model to represent MWO interference based on experimental measure ment results is employed. As well known that MWO interference exhibits a bursty impulsive characteristic in time, a technique to transmit multiple long spreading codes (multicode transmission) is introduced for the DS-SS system to overcome the burstness of the interference. Moreover, inspired by the broadband in frequency of MWO interference, a technique to estimate the channel MWO interference by means of observing its levels in an adjacent channel is proposed, and this technique is applied to construct a multicode DS-SS receiver which can suppress the channel MWO interference. An evaluation of the Lit error rate performance of the proposed multicode DS-SS system is conducted bg computer simulation, and the numerical results demonstrate that the proposed DS-SS system can operate effectively even in the presence of MWO interference.

Angle Diversity Reception technique with CNR Estimation under Man-made Noise and Multipath Fading Environments

TOU S.

Proceedings of ISAP2000     1565 - 1568   2000

Indoor Optical Wireless Local Area Network Systems

Optics   ( 5 ) 139 - 143   2000

Overlapped Zone Construction for Hybrid Line-of-Sight Indoor Infrared Wireless Communication System

Fifth Optoelectronics and Communication Conference(OECC2000)Technical Digest     240 - 241   2000

A Proposal of Adaptive Multicode Transmission for DS-SS System under ISM Interference Environments

Sakda Unawong, Shinichi Miyamoto, Norihiko Morinaga

1999 Asia-Pacific Microwave Conference     186 - 189   1999.12  [Refereed]

CNR Estimation under Man-made Noise Environment and Its Application to Noise Reduction Technique using Sector Antenna

Shinichi Miyamoto, Kensuke Yoshizawa, Norihiko Morinaga

1999 Asia-Pacific Microwave Conference     190 - 193   1999.12  [Refereed]

Indoor Wireless Local Area Network System using Infrared and Radio Communications

Shinichi Miyamoto, Yoshiyasu Hirayama, Norihiko Morinaga

1999 Asia-Pacific Conference on Communications     790 - 793   1999.10  [Refereed]

Zone Construction for PPM/CDMA-Based Non-Directed Line-of-Sight Indoor Infrared Wireless Communication System

Makoto Funabiki, Shinichi Miyamoto, Kazutoshi Hirohashi, Norihiko Morinaga

10th International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC'99)     726 - 730   1999.09  [Refereed]

Multiple Zone Construction and Countermeasure against Shadowing for Non-Directed Line-of-Sight Indoor Infrared Wireless Communication System

Yoshiyasu Hirayama, Shinichi Miyamoto, Masahisa Sakai, Norihiko Morinaga

10th International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC'99)     831 - 835   1999.09  [Refereed]

Angle Diversity Reception in ISM-band Wireless LAN Systems under Man-made Noise Environment

Kensuke Yoshizawa, Shinichi Miyamoto, Norihiko Morinaga

10th International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC'99)     731 - 735   1999.09  [Refereed]

A novel receiver design for DS-CDMA systems under impulsive radio noise environments

S Unawong, S Miyamoto, N Morinaga

IEICE TRANSACTIONS ON COMMUNICATIONS ( IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG )  E82B ( 6 ) 936 - 943   1999.06

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In this paper, we investigate the bit error rate (BER) performance of Direct Sequence-Code Division Multiple Access (DS-CDMA) systems under impulsive radio noise environments, and propose a novel DS-CDMA receiver which is designed to be robust against impulsive noise. At first, employing the Middleton's Class-A impulsive noise model as a typical model of impulsive radio noise, we discuss the statistical characteristics of impulsive radio noise and demonstrate that the quadrature components of impulsive noise are statistically dependent. Next, based on the computer simulation, we evaluate the BER performance of a conventional DS-CDMA system under a Class-A impulsive noise environment, and illustrate that the performance of the conventional DS-CDMA system is drastically degraded by the effects of the impulsive noise. To deal with this problem, motivated by the statistical dependence between the quadrature components of impulsive radio noise, we propose a new DS-CDNA receiver which can eliminate the effects of the channel impulsive noise. The numerical result shows that the performance of the DS-CDMA system under the impulsive noise environment is significantly improved by using this proposed receiver. Finally to confirm the effectiveness of this proposed receiver against actual impulsive radio noise, we evaluate the BER performance of the DS-CDMA system employing the proposed receiver under a microwave oven (MWO) noise environment and discuss the robustness of the proposed receiver against MWO noise.

Man-made Noise Reduction Scheme Using Sector Antenna in Digital Radio Communication System

Kensuke Yoshizawa, Shinichi Miyamoto, Norihiko Morinaga

International Symposium on Electromagnetic Compatibility (EMC'99/Tokyo)   670   670 - 673   1999.05  [Refereed]

The BCH Coded Digital Radio Communication System under Man-made Noise Environments

Sakda Unawong, Shinichi Miyamoto, Norihiko Morinaga

International Symposium on Electromagnetic Compatibility (EMC'99/Tokyo)     321 - 324   1999.05  [Refereed]

Application of chip-interleaving and blanker for DS-SS system under microwave oven interference environment

S Unawong, S Miyamoto, N Morinaga

ELECTRONICS LETTERS ( IEE-INST ELEC ENG )  35 ( 9 ) 695 - 696   1999.04

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The application of chip-interleaving and a blanker for improving the bit error rate performance of a direct-sequence-spread-spectrum (DS-SS) system under microwave oven interference is described. Numerical results demonstrate that the proposed DS-SS system performs well even in the presence of the microwave oven interference.

DOI

A Study on Parameter Estimation and Error Rate Performance of Optimum Receiver under Class-A Impulsive Radio Noise Environment

KANEMOTO Hideki, MIYAMOTO Shinichi, MORINAGA Norihiko

ITE Technical Report ( The Institute of Image Information and Television Engineers )  23 ( 24 ) 79 - 86   1999.03

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In order to improve true error rate performance under radio frequency man-made noise enviroment, optimum reception based on the statistical characteristics of man-made noise has been proposed. In this optimum reception, the statistical characteristics of mam-made noise have to be estimated in advance. In this paper, we employ Middleton's class-A impulsive noise model as a statistical model of man-made noise, and discuss the parameter estimation of class-A model and the performance of optimum receiver constructed with estimated parameters. Numerical results show that, although the enormous amount of noise sample is required to obtain precise estimated parameters, a good error performance of optimum receiver can be obtained with parameters estimated by a certain amount of noise sample.

DOI