Preface - kmutt

KMUTT Annual Research Abstracts 2005
Raungrong Suleesathira
2005 CACS Automatic Control Conference,
November 18-19, 2005, Southern Taiwan
University of Technology Tainan, Tainan,
Taiwan, p. i-150
An adaptive Generalized Sidelobe
Canceller (GSC) beamformer is proposed for
Multiple Access Interference (MAI) cancellation
in the MC-CDMA receiver. In GSC
beamforming, the mainbeam is formed in the
look direction estimated form the MUSIC
algorithm while MAI is cancelled by adaptive
nulling in the unlook directions. The adaptation
is to minimize the mean output power of the
processor, while maintaining the unity response
in the look direction based on the steepest
descent method. The simulation results are given
to illustrate the performance of the presented
beamformer compared to the conventional MC-
CDMA receiver. It is capable of reducing Bit
Error Rates (BERs) of the desired user in
Rayleigh fading channel.
IC-043 EQUALIZER AND SUB-ARRAY
BEAMFORMER FOR SPEECH
ENHANCEMENT
Weerawat Taweesangrungroj,
Raungrong Suleesathira
2005 CACS Automatic Control Conference,
November 18-19, 2005, Southern Taiwan
University of Technology Tainan, Tainan,
Taiwan, p. i-151
This paper proposes the use of
equalizers and sub-array beamformers for
speech enhancement to reduce echoes and
interferences in room enclosure, such as
conference rooms or classrooms. The method is
based on a microphone array processing
technique. It consists of sub-array division
inverse filtering and beamforming. Sub-array
technique divides a broadband signal into a
spectral series of narrowband signals. Inverse
filter uses for equalizing the reverberant
characteristics. It is obtained by the minimumphase
component of the room impulse response.
The optimal beamformer has and ability to
remove the interference signal. Simulation
results are given to illustrate the efficiency of the
proposed method in comparison to using the
delay-and-sum beamforming and the optimal
beamforming. The equalizer and sub-array
beamformer achieve a good performance in that
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the quality of captured sound is higher than
those two methods.
IC-044 IMAGING FM-CW RADAR SYSTEM
FOR INDOOR HUMAN DETECTION
Chanin Wong-ngamkam,
Raungrong Suleesathira, Paisarn Keawket
The 20 th Commemorative International
Technical Conference on Circuits/Systems,
Computers and Communications (ITC-CSCC
2005), July 4-7, 2005, The Shilla Hotel, Jeju,
Korea, pp. 813-814.
In this paper, the use of a scanned FM-
CW radar to detect human motion in building is
investigated. The designed radar system consists
of RF section, baseband section, data acquisition
and control unit, processing and display. The RF
section is to generate a radar signal having
power 13 dBm at the center frequency 12.46
GHz and sweep frequency 200 MHz. Mixing the
reflected radar with the transmitted signal, we
obtain the beat frequency. The output of the
mixer is then filtered and amplified at the
baseband section. In the section of acquisition
and controlling, an analog-to-digital converter,
an encoder, a motor and a microcontroller
(89c51) are employed to interface a computer
via RS232. The resulting beat frequency given
by FFT in the processing section allows us to
obtain the target range. After testing the
accuracy of the presented radar system, the
experiments are done in two cases: with and
without obstacles. The radar images show the
detection of the human movement using our
designed FM-CW radar system.
IC-045 THE ANALYSIS OF MOBILE PHONE
UTILIZATION IN LAOS WITH NEURAL
NETWORK
Bounhap Souligno, Wuttipong Kumwilaisak,
Chirasil Chayawan
The 20 th Commemorative International
Technical Conference on Circuits/Systems,
Computers and Communications (ITC-CSCC
2005), July 4-7, 2005, The Shilla Hotel, Jeju,
Korea, pp. 1325-1326
This paper addresses the analytical
method of Mobile phone utilization in Laos
People’s Democratic Republic (PDR) with
neural network. In our study, several important
factors are used for forecasting the growth of
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