KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Search Results

Now showing 1 - 9 of 9

Some of the metrics are blocked by your
consent settings
A non-binary LDPC Code in WBAN: Patterned data transmission
(2016-01-25)
Timakul, Sekson
;
Sansoda, Buncha
;
Choomchuay, Somsak
This paper details the application of a PEG originated non-binary LDPC codes designed to fit the pay load size of MAC frame of IEEE 802.15.6 Wireless Body Area Network. The resulted codes are with the block size is 255 bytes. Codes with the rate of 0.5 and 0.9 are investigated for their performance. The symbol error rate and block error rate performance given by the system simulation has confirmed that the non-binary LDPC code can yield better performance when compared with hard decision Reed Solomon codes.
Some of the metrics are blocked by your
consent settings
Performance evaluation of LDPC codes on patterned WBAN data
(2015-01-26)
Sansoda, Buncha
;
Choomchuay, Somak
;
Timakul, Sekson
;
Khattiya, Wannarit
In this decade, WBAN plays vital role in health care monitoring environment. It has been used more intensively in wider applications. This paper proposes error control coding applied to WBAN. LDPC codes with the block size of 255 bytes are particularly of interest. Patterned information such as MIT-BIH's arrhythmia datasets extracted from Electrocardiography (ECG) of the patients who encountered heart disease. To measure the system performance, random data are also examined. The system was simulated on Rician channel where severe noise are quite nature to WBAN compared to AWGN channel. Rician channel with some K-factors was investigated. The obtained result shows that both patterned data and random data can be recovered well when Eb/N0 equals 3 dB and above. While the code rates were made varied from 0.50 to 0.75, we can obtain the gain of 3 dB, 5 dB, and 6 dB respectively.
Some of the metrics are blocked by your
consent settings
A construction of non binary LDPC codes by circular matrices
(2014-01-01)
Timakul, Sekson
;
Choomchuay, Somsak
In LDPC code, the structure of code's parity check matrix plays the crucial role in code performance. In this paper proposes the preliminary investigation of a designed parity check matrix from Tanner. We modify this technique in to non binary LDPC structure and decoding with FFT-SPA. We take into high code rate application more than 0.8. The result has shown that in bit error rate (BER) compare between non-binary LDPC and binary LDPC. In our results, the performance of non binary LDPC has better than binary LDPC. © (2014) Trans Tech Publications, Switzerland.
Some of the metrics are blocked by your
consent settings
An error control coding in MAC layer for UWB WBAN
(2013-12-01)
Khattiya, Wannarit
;
Timakul, Sekson
;
Choomchuay, Somsak
Nowadays, Wireless Body Area Network (WBAN) has become an interesting area of researchers since it can facilitate medical experts to provide a real-time health monitoring. The increasing of elder population is the main driven factor in implementing the medical intelligent services. Application of intelligent medical care system in the disaster environment is also not even less important. In such a vital application system as well as other large bandwidth requirement system, such as a cardiogram and heartbeat monitoring, the communication needs not only the reliability but also the realtime action. Considering the physical layer of IEEE 802.15.6 standard, Ultra Wideband offers an advantage in term of bandwidth availability. In this paper we propose the preliminary investigation of the application of error control code to MAC layer data. Of its both random and burst error correction capability, Reed-Solomon codes have been considered. In our investigation, several MIT-BIH Arrhythmia databases are chosen as input data. The coding scheme is applied to the 250 byte payload data. RS(250, k) which is the shorten version of RS(255, k) defined in GF(256) with variable code rate are investigated. AWGN channel and fading channels are employed to examine code's performance. © 2013 IEEE.
Some of the metrics are blocked by your
consent settings
A simple parity check matrix LDPC code for perpendicular magnetic recording channels
(2013-09-02)
Timakul, Sekson
;
Choochuay, Somsak
In LDPC code design, the structure of code's parity check matrix can be very crucial to code performance. In this paper, we have investigated a simple designed parity check matrix when the code is applied to a PMR channel of a storage system. Belief propagation algorithm and min-sum algorithm are two major decoding algorithms used to benchmarked the code's merits. Additive white Gaussian noise channel (AWGN) and perpendicular magnetic recording (PMR) channel with SISO equalizer in PR2 target are the conditions of our investigation. The LDPC code itself is a modified array type. Its construction fairly simple compared to normal array and quasi-cyclic code. We used two decision variables to define the permutation matrix. A method proposed by Tanner's et.al had been adapted to the modified array code. The decoders have been tested for 5 and 20. iterations. SNR versus BER and BLER were measured. © 2013 IEEE.
Some of the metrics are blocked by your
consent settings
A simple algorithm for a high code rate LDPC parity matrix design
(2011-12-26)
Timakul, Sekson
;
Choomchuay, Somsak
This paper presents a simple method in designing a parity matrix of low density parity check codes. According to its use the use of arithmetic sequence is ideal for high rate code with no existing of cycle 4. The design is applicable to array code, modified array code, and quasi cyclic code. Upon the investigation, the designed code has delivered a similar BER-SNR performance when compared with that of more complicate designed matrices. © 2011 IEEE.
Some of the metrics are blocked by your
consent settings
Construction of quasi-cyclic LDPC codes form SFT structure and cyclic shift
(2011-12-01)
Timakul, Sekson
;
Choomchuay, Somsak
This paper presents an alternative a method for designing a parity matrix of low density parity check codes. The proposed method can be viewed as a generalized version of Sridara-Fuja-Tanner (SFT) technique which is ideal for regular quasi cyclic code design. Upon the current investigation, the designed code has delivered a comparable BER-SNR performance when compared with that of more complicate designed matrix. The designed code offers similar performance when compared with Sridara-Fuja-Tanner code and Quadratic Congruences structure. In additions, the resulted matrix also has a desirable structure that it suits well the hardware implementation. © 2011 IEEE.
Some of the metrics are blocked by your
consent settings
A design of nonprime block irregular LDPC codes via CRT
(2010-12-01)
Chusin, Chalit
;
Prasartkaew, Chutima
;
Timakul, Sekson
;
Choomchuay, Somsak
This paper presents a new design of irregular LDPC codes that supports arbitrary block length. We propose the efficient construction method when nonprime size sub-matrices are used. The problem where GCD(L<inf>1</inf>,L <inf>2</inf>) that left unsolved has been tackled. We also consider the case GCD(L<inf>1</inf>,L<inf>2</inf>)=1 but L<inf>1</inf> or L<inf>2</inf> is a nonprime number. The results show that our designed codes have superior performance compared to MAC. The resulted codes still hold the attractive properties of LDPC codes. The performances of interleaved codes are higher than noninterleaved codes and it goes higher as SNR is increased. ©2010 IEEE.
Some of the metrics are blocked by your
consent settings
An overlapping Min-Sum LDPC decoder for IEEE 802.11n
(2010-12-01)
Timakul, Sekson
;
Tanyanon, Itsara
;
Choomchuay, Somsak
This paper presents overlapping techniques designed for a compact hardware LDPC decoder with MS algorithm. The design is applicable to IEEE 802.11n standard. We elaborate how to reduce hardware and cycle time between row and column operation. The hardware utilization can be better enhanced and 16-40% cycle time reduction compared to a non-overlapping decoder can be achieved. © 2010 IEEE.

KMITL

Browse

Filters

Settings

Sort By

Results per page

Search Results