• Title/Summary/Keyword: BER characteristic

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Improvements of the OFDM System Performance By Using the Characteristic of Circularly Polarized Waves and Carrier Interferometry Signals (원형편파특성과 반송파 간섭신호특성을 적용한 OFDM 시스템 성능 개선)

  • Ahn, Je-Sung;Ha, Deock-Ho
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.32 no.8A
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    • pp.794-801
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    • 2007
  • In this paper, in order to enhance the performance improvements of both BER and PAPR characteristic for the conventional OFDM system, both circularly polarized waves and carrier interferometry signals which shows the robustic fading reduction effect are applied to the system, and then the performance of the proposed system has been evaluated by computer simulation. From the analysis, it can be seen that the system BER performance can be improved by 2 or 3 dB. Furthermore, it can be also seen that the PAPR characteristic can be markedly reduced.

Characteristic Analysis of Proposed Chaos Map in CDSK System (CDSK 변조 방식에서 제안한 카오스 맵의 특성 분석)

  • Lee, Jun-Hyun;Ryu, Heung-Gyoon
    • Journal of the Institute of Electronics and Information Engineers
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    • v.51 no.5
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    • pp.44-50
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    • 2014
  • Chaos communication system is one of the security algorithms that is applied to improve the security. Chaos signal is non-linear, and it is generated randomly according to the initial conditions. Also, chaos communication system has characteristics such as non-periodic, wide-band, non-predictability of signals and easy implementation. So, security of chaos communication system is superior, and it has low interception probability and good anti-jamming characteristic. However, BER performance is worse than digital communication system, because it has many self interference signal in case of CDSK system. To improve these disadvantages, we analyze the PDF trend which can improve the BER performance in existing study, and we proposed a chaos map. And, proposed chaos map was defined as the 'Boss map'. Generally, BER performance is changed according to initial values, parameters and spreading factors. Therefore, in this paper, we will introduce PDF trends which can improve the BER performance, and will describe about Boss map. Also, characteristics of Boss map is analyzed by evaluating the BER performance of Boss map according to initial values, parameters and spreading factors. As a result, while maintaining the similar BER performance, initial value of Boss map can be selected from 0 to 1.2, and BER performance is best when parameter alpha is 2.5. Also, BER performance is best when spreading factor is 50.

A Novel Design of CDSK Receiver for Improving the BER Performance (BER 성능 향상을 위해 제안하는 새로운 CDSK 수신기)

  • Lee, Jun-Hyun;Ryu, Heung-Gyoon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.38A no.8
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    • pp.638-643
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    • 2013
  • Chaos communication system has a sensitive characteristic to initial conditions, because completely another signal is generated when initial condition of chaos equation is changed subtly. Also, chaos communication systems have the characteristics of non-periodic, non-predictability, the broadband signal, such as ease of implementation. Due to these characteristics, security of chaos communication system generally is evaluated better than other systems. However, BER(Bit Error Rate) performance is evaluated worse than other digital system, because existing chaos communication system's transmitter and receiver are strong influence by interference signal and noise. So, research to improve the BER performance of the chaotic communication system is performed continuously. In this paper, We will propose a new CDSK(Correlation Delay Shift Keying) receiver for BER performance improvement. After we compare to the performance of existing CDSK receiver and proposed CDSK receiver, BER performance of proposed CDSK receiver evaluate. Also, when using the new CDSK receiver, we evaluate the BER performance according to the spreading factors and find an optimum spreading factor. If chaos communication system use a new CDSK receiver, BER performance is improved than existing CDSK receiver. Also, if spreading factor's value is increased, BER performance is improved, because it is not nearly affected by interference signal and noise.

The Analysis of Multipath Characteristic Using Inductance Loaded Antenna (인덕턴스 장하 안테나의 다중경로특성 해석)

  • Hwang, Jae-Ho
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2010.10a
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    • pp.559-562
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    • 2010
  • This paper deals with characteristic of the several environment of multipath using antennas. The transmit antenna is ${\lambda}$/4 dipole and receive antenna is inductance loaded antenna. We investigate the significance of a solution of interference by multipath by comparing BER(Bit-Error-Rate) in multipath environment.

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Channel Equalization Characteristic of Lattice Filter in OFDM Signal (Lattice 필터에 의한 OFDM 신호의 채널 등화 특성)

  • 조상현;이우재;신위재;주창복
    • Proceedings of the Korea Institute of Convergence Signal Processing
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    • 2001.06a
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    • pp.45-48
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    • 2001
  • In this paper, the characteristic of the equalizer using Lattice filter was investigated in channel ISI (Inter-Symbol Interference) in OFDM (orthogonal frequency division multiplexing) system. The equalizer using lattice filter has more fast convergence and little equalization error characteristic in two number of tap by orthogonal effect of each tap than another equalizers. The filter coefficient convergency and static BER (bit error ratio) characteristic was analysed by computer simulation. In this paper, it is shown that the equalizer using lattice filter has the better performance than a equalizer which makes use of another equalization method.

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Performance Evaluation of a Novel Chaos Transceiver for the High Level Modulation (고레벨 변조를 위한 새로운 카오스 송수신기의 성능 평가)

  • Lee, Jun-Hyun;Ryu, Heung-Gyoon
    • Journal of the Institute of Electronics and Information Engineers
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    • v.51 no.1
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    • pp.31-36
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    • 2014
  • Security of chaos communication system that has characteristic of sensitive initial conditions is superior to digital communication systems, but BER(Bit Error Rate) performance is evaluatied badly. So, studies in order to improve the BER performance is important. existing studies, BER performance of proposed chaos transceiver is possible to improve than the CDSK(Correlation Delay Shift Keying) system because it has characteristic that has very few addition elements like noise signal except for the desired signal. Chaos communication system has many symbols because it spreads according to characteristic of chaos map. Therefore, study that can have the good data rate in chaos communication system is required. Information bits of existing chaos modulation system are modulated as -1 and 1 on the basis of BPSK system. However, instead of BPSK system, if chaos communication system is applied high level modulation systems such as QPSK system and 16QAM system, it is possible to have good data rate because more data are transmitted at a time. In the paper, when QPSK system and 16QAM system are applied to proposed chaos transceiver in existing study, we evaluate the SER(Symbol Error Rate) performance and compare the each performance. Also, when QPSK system and 16QAM system are applied to proposed chaos transceiver, we evaluate the anti-jamming performance of proposed system.

A study on the Phase Noise Performance of CATV Transmission System (CATV 전송시스템 위상잡음성능에 관한 연구)

  • Lee, Yong-Woo;Oh, Seung-Hyeub
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.10 no.4
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    • pp.199-204
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    • 2010
  • Recently, the transmission amount of information that each single person requires is growing by development of electron information communication technology. So in this paper we analysis the phase noise characteristics to obtain a most suitable of SNR performance request characteristic by BER on CATV transmission system that satisfy performance request DOCSIS 2.0 standard. Especially we get the parameter value of PLL that satisfy phase noise characteristic request standard using developed simulator. Presented method can be used to obtain a performance request standard connection performance request standard of high speed CATV transmission system in the future.

A study on the phase noise performance improvement of CATV transmission system using the simulator (시뮬레이터를 이용한 CATV 전송시스템 위상잡음성능 개선에 관한 연구)

  • Lee, Yong-Woo;Oh, Seung-Hyeub;Chang, Sang-Hyun;Lee, Il-Kyoo
    • Journal of Satellite, Information and Communications
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    • v.5 no.1
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    • pp.1-5
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    • 2010
  • Recently, the transmission amount of information that each single person requires is growing by development of electron information communication technology. So in this paper we analysis the phase noise characteristics to obtain a most suitable of SNR performance request characteristic by BER on CATV transmission system that satisfy performance request DOCSIS 2.0 standard. Especially we get the parameter value of PLL that satisfy phase noise characteristic request standard using developed simulator. Presented method can be used to obtain a performance request standard connection performance request standard of high speed CATV transmission system in the future.

Exact Bit Error Rate Calculation of UWB-TH PPM Multiple Access Communication systems (UWB-TH PPM 다중 통신시스템의 정확한 비트 오율의 계산)

  • Park, Jang-Woo;Cho, Sung-Eon;Choi, Yong-Suk
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.9 no.6
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    • pp.1174-1181
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    • 2005
  • The exact bit error rate(BER) calculation of an UWB-TH PPM multiple access communication system, which is known to be suitable for the fast transmission of massive information data, is introduced. The statistic feature of the multiple access intereference (MAI) of the system is precisely modeled by the characteristic function technique. The concrete expression for the MAI allows the exact expression for BER to be derived. In addition, we propose the approximate expression for the BER which reveals superior accuracy to the expression from the previous Gaussian approximation of the MAI. The validity of the proposed expressions is confirmed from the comparison of proposed results with the results from Monte-Carlo simulation.

The Calculation of the Exact BER of UWB-TH BPSK Communication systems with the Multiple User Interference (다중 사용자 간섭을 고려한 TH-BPSK UWB 통신 시스템의 정확한 BER 계산)

  • Park, Jang-Woo;Choi, Yong-Seok;Cho, Kyung-Ryong
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.9 no.5
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    • pp.951-957
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    • 2005
  • The bit error probability of UWB Time-Hopping(TH) multiple access communication systems combined with BPSK is calculated with a high accuracy including the multiple user interference(MUI). This paper finds that with some manipulations, the TH-BPSK UWB signal can be modified to the similar form of the DS-CDMA signal. The MUI in the system is explained by the characteristic function technique. Above two descriptions have been bases on the derivation of the exact BER expression of the system. We also propose the approximate expression for the BER, which has enough accuracy compared with the expression from the Gaussian approximation of the MUI. The comparison of the results from the proposed expressions with the simulation results gives the confirmation for the validity and accuracy of the proposed expressions.