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Active Noise Control Using Particle Filter Algorithm for Nonlinear and Time-Varying Environment
Varanya Plodchinda,Lunchakorn Wuttisittikulkij,Pisit Vanichchanunt 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
Acoustic noise is one of the pressing problems in our expanding city as it effects mental and physical health to people nearby. Many researchers have made an attempt to invent applications to eliminate the noise and one of these applications is active noise control. However, the environment is not always linear and time-invariant. This makes some updating algorithms not efficient enough to cancel all unwanted sounds. In this paper, therefore, we propose active noise control using particle filter algorithm for nonlinear and time-varying environment. The simulation results show that particle filter is a truly exceptional algorithm in reducing undesired sound compared with LMS and RLS algorithms.
On the Lifting of Girth for Quasi-Cyclic LDPC Codes using Chinese Remainder Theorem
Ambar Bajpai,Lunchakorn Wuttisittikulkij,Piya Kovintavewat 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
Quasi-Cyclic LDPC (QC-LDPC) codes are widely accepted as a standard for various wireless communication systems in the present and are recommended for future applications. Girth is an important parameter for designing a good general class of LDPC codes. However, obtaining high girth for a parity-check matrix requires lot of computational and structural complexities. To reduce the complexity, this paper proposes to combine the exponent matrices of QC-LDPC codes using the Chinese Remainder Theorem. Simulation results show that a high girth large block-length QC-LDPC code can be obtained from less girth component of QC-LDPC codes.
Puttipong Sornplaeng,Poompat Saengudomlert,Lunchakorn Wuttisittikulkij 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
We consider the problem of routing and rate assignment with extended p-cycle protection for mixed line rate (MLR) networks that are limited by transmission reaches. The problem is formulated mathematically as an integer linear programming (ILP) problem under the assumption that allows each p-cycle to protect working lightpaths with various transmission rates. The objective of ILP is to minimize the overall cost function, which consists of transponder operating costs as primary costs and pcycle operating costs as secondary costs. We perform a comparative study between extended pcycle and conventional p-cycle approaches. Numerical results demonstrate that the extended pcycle approach yields lower costs and is more efficient for network protection than conventional pcycle protection .
Artifical Neural Network Based Visible Light Positioning System Employing Received Signal Strength
Muhammad Saadi,Yan Zhao,Lunchakorn Wuttisittikulkij 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
We propose an indoor positioning system for light emitting diodes (LEDs) and demonstrated it via simulation. Received signal strength (RSS) at the receiver from the two LEDs is recorded at various locations of the room and then artificial neural networks is applied to estimate the location of the object. The performance of the proposed algorithm is evaluated via MATLAB and on average regression of 0.998 can be achieved for two-dimensional scenario and regression of 0.83 can be achieved for three-dimensional scenario for a room with dimensions of 5m × 5m × 4m.
Petcharat Suriyachai,Tinnapop Raedeebuk,Lunchakorn Wuttisittikulkij 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
This paper details the design and implementation of a low-cost tracking system of university shuttle buses. The system consists of a tracking device, lightweight web server and Android smartphone application. The tracking device is made from an inexpensive Raspberry Pi board connected to a GPS module and 3G modem. It is placed inside a bus to report real-time feeds of the bus’s locations to the remote web server. A passenger employs the Android smartphone application to display a bus route map and to obtain the current location and expected arrival time of buses from the web server. The system evaluation indicates that the system can provide an accurate and satisfying location-tracking service, leading to an effective utilization of public transportation in a university with affordable cost.
Extended Decoding Performance of LDPC and NB-LDPC Codes with IEEE 802.11n Standard
Nut Tantibut,Ambar Bajpai,Lunchakorn Wuttisittikulkij,Piya Kovintavewat 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
Recently, low-density parity-check (LDPC) codes are widely used in wireless communication as a channel code and recommended for future standards. However, higher orders Galois Fields (GFs) for LDPC codes have not been extensively studied. In this paper, we present extended GFs to analyze the performance of non-binary LDPC codes. The parity-check matrix H is analyzed for IEEE 802.11n standard with half rate and block-size of 648. Decoding is done by using Fast Fourier Transform (FFT) based belief propagation for fast decoding. Code performance is measured in terms of bit error rate (BER) at higher order of Galois Fields.
A Simple Frame Size Adjustment for Framed Slotted Aloha RFID Anti-collision Algorithm
Robithoh Annur,Suvit Nakpeerayuth,Lunchakorn Wuttisittikulkij 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
In this paper, we propose a simple frame size adjustment of dynamic framed slotted Aloha (DFSA) for tag identification in RFID networks. In DFSA, the reader is required to announce the frame size for every frame. To achieve maximum system throughput, it is essential to set the frame size according to the number unidentified tag appropriately. To estimate the number of tags, we utilize the ratio between the number of collision and idle slots. We observe first view slots of the frame for fast frame adjustment. Simulation results show that the smaller number of slots to be observed results in faster frame adjustment. The throughput of almost 0.35 can be achieved for the number of tags ranging from small to large number of tags.
Simple-API (Application Programming Interface) for an Arduino-based Wireless Sensor Mote
Thiti Sittivangkul,Weerasak Cheunta,Nitthita Chirdchoo,Lunchakorn Wuttisittikulkij 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
In this paper, Simple-API for an Arduino-based platform sensor mote is proposed. It is designed especially to reduce the complexity and the difficulty in dealing with MCU hardware register, interface driver, hardware register and device driver, with which the wireless sensor network (WSN) application developers need to involve during software development. Simple-API allows developers to focus more on algorithm design and coding only at the application level, thus providing a more convenient and faster means in developing an application for WSNs. When comparing to the commercially popular Waspmote platform, it is obvious that coding using Simple-API requires less effort in coding by minimizing the complexity in dealing with hardware level coding.