http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
A Study on Huffman Coding to Improve Performance of OFDM
Mashhur Sattorov,Heau-Jo Kang 한국정보기술학회 2009 한국정보기술학회논문지 Vol.7 No.6
In this paper, we analyze one of the coding techniques on OFDM, named Huffman coded OFDM (HC-OFDM) that contributes not only to high data rate but also prevents peak the signals when they sum up after IFFT process, while decreasing the BER. HC-OFDM simulations reached valuable results on a big data stream transmission and lower peak to average power ratio (PAPR) probability over Rayleigh fading channel and phase offset comparison at the detection which their BER and PAPR values are smaller at 10<SUP>-1</SUP> and 3-4 db respectively than an uncoded OFDM.
Pros and Cons of Multi-User Orthogonal Frequency Division Multiplexing
마쉬후르 사토로프(Mashhur Sattorov),여상수(Sang-Soo Yeo),강희조(Heau-Jo Kang) 한국정보기술학회 2009 Proceedings of KIIT Conference Vol.2009 No.-
지난 10년간 OFDM 기술에 적합한 적응 변조에 대한 많은 연구가 있었다. 그러나 현재는 대다수 연구자들이, 4G 시대에서 높은 QoS를 제공하기 위해서, 적응 변조 기술에 대한 높은 데이터 전송율과 고성능 다중경로 주파수 효율, 신뢰성 있는 사용자/자원 할당 등에 대한 연구에 집중하고 있음을 볼 수 있다. 따라서 이러한 변조 기법의 장단점을 분석해보는 것은 더 좋은 연구개발로 나아가는 방법이 될 수 있다. 그래서 본 논문에서는 OFDM 분산 스펙트럼 기법의 장단점을 살펴보고, 단점에 대한 해결책을 집중 조명하고자 한다. In the past decades, most researches focused on adaptive modulation on orthogonal frequency division modulation (OFDM) technique. However, nowadays, we can observe majority of scientific areas are engaging in to achieve advanced multi-path spectral efficiency, user/resource allocation in reliable as well as high data rate transmission on this modulation technique in order to achieve high quality of service (QoS) in 4G period. Therefore, obtaining this modulation scheme’s plus and minus concerns bring us to reach to develop better. Thus, in this thesis, we will focus on an overview of OFDM spread spectrum scheme’s pros and cons issues and to highlight hot solutions for disadvantages.
Online Payment Service System for Mobile Companies in Uzbekistan
Jei Sang Jeon,Mashhur Sattorov 대한전자공학회 2008 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
Right across the world, we observe the rapid development of information-processing systems that may displace, over time, many of the systems by which payment related information is communicated. Indeed, stored value systems, as well as credit based and deposit account based systems that communicate instructions or transfer value over open communication and computer networks, represent new techniques (based on encryption schemes) to initiate payments. These new techniques hold a great deal of promise in that they potentially offer added convenience to the consumer. This promise is qualified by the question of whether these new means of payment might add to risk in the payment system.