• Title/Summary/Keyword: BER Model

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Performance Analysis of Traffic Model and Location Estimation Algorithm with eTDOA Scheme in 2.45GHz Band RTLS (2.45GHz 대역 RTLS 트래픽 모델 및 eTDOA 기법을 이용한 위치추정 알고리즘의 성능분석)

  • Jeong, Seung-Hee;Lee, Hyun-Jae;Ko, Bong-Jin;Oh, Chang-Heon;Lim, Choon-Sik
    • Journal of Advanced Navigation Technology
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    • v.10 no.2
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    • pp.95-102
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    • 2006
  • In this paper, we model a traffic of multiple tags operated in 2.45GHz band RTLS environment and analyze the multi-tag interference. Also, we propose a high precision location estimation algorithm of RTLS and then analyze its performance. From the results, the BER performance of RTLS degrades as the number of multi-tags increase in Gaussian noise and fading(m=15) environment. To meet the BER specification of RTLS, $10^{-5}$, we have to limit the multi-tag number to below 40. We also estimate the tag's location in $250m{\times}250m$ searching-area with enhanced TDOA scheme. It is confirmed that the 3m radius within accuracy of RTLS specification is satisfied, if the number of sub-blink receives more than 2 when available reader is 3 to 8.

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Fast Distributed Video Decoding Using BER model for Applications with Motion Information Feedback (움직임 정보 피드백이 가능한 응용을 위한 BER모델을 이용한 고속 분산 비디오 복호화 기법)

  • Kim, Man-Jae;Kim, Jin-Soo
    • The Journal of the Korea Contents Association
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    • v.12 no.12
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    • pp.14-24
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    • 2012
  • DVC (Distributed Video Coding) techniques need feedback channel for parity bit control to achieve the good RD performances, however, this causes the DVC system to have high decoding latency. In order to implement in real time environments and to accelerate commercializations, many research works have been focusing on the development of fast video decoding algorithm. As one of the real time implementations, this paper deals with a novel DVC scheme suitable for some application areas where source statistics such as motion information can be provided to the encoder side from the decoder side. That is, this paper propose a fast distributed video decoding scheme to improve the decoding speed by using the feedback of motion information derived in SI generation. Through computer simulations, it is shown that the proposed method outperforms the conventional fast DVC decoding schemes.

Performance of ACL/SCO Packet Data in Bluetooth Wireless Ad/hoc Network (블루투스 무선 Ad-hoc망에서 ACL/SCO 패킷 데이터의 성능)

  • 김도균;노재성;조성언;조성준
    • Proceedings of the IEEK Conference
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    • 2001.06a
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    • pp.29-32
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    • 2001
  • This paper has simulated the PER(Packet Error Rate), ratio of received packet and payload BER of Bluetooth system with packet types of ACL(Asynchronous Connection Less) and SCO(Synchronous Connection Oriented) link over wireless Ad-hoc environment. AWGN(Additive White Gaussian Noise) and Rayleigh fading are considered as channel model, and the analysis is based on the baseband model of Bluetooth system. In terms of PER and ratio of received packet, performance of DM1 packet is almost same as those of HV1, HV2 and HV3 packets, the performances of the other packets depend on the packet types. In terms of payload BER performance, there is no difference among HV2 packet of SCO link and DM1, DM3, DM5 packets of ACL link. Moreover, there is no difference among HV3 packet of SCO link and DM1, DM3, DM5 packets of ACL link, too.

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Spectrum Sensing for Cognitive Radio based on RVM

  • Shi, Shangkun;Yan, Jiao;Joe, Inwhee
    • Proceedings of the Korea Information Processing Society Conference
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    • 2019.05a
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    • pp.86-88
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    • 2019
  • In a complex geographical environment, communication quality of communication equipment is being seriously challenged. Secondary Users(SUs) must make the best possible use the idle spectrums that Primary Users(PUs) do not use and change spectrum frequently. Using the relevance vector machine(RVM) to establish a signal noise Ratio(SNR) Model for interference information and bit error rate(BER). Through the model and real-time interference information, the minimum channel SNR meeting the BER requirements of communication equipment can be predicted, and we can also calculate the minimum transmitted power. According to the simulation results, this method has better performance for selecting available channel and restraining interference.

Design and Performance Evaluation of Predistorter to Compensate HPA Nonlinearity in 16-QAM System (16-QAM 시스템에서 HPA 비선형성을 보상하기 위한 사전왜곡기의 설계 및 성능 평가)

  • Jang, Kyeongsoo;Ryu, Heung-Gyoon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.28 no.12
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    • pp.948-953
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    • 2017
  • When using a high-power amplifier(HPA) for high-speed communication, the nonlinear characteristics of the HPA deteriorate power efficiency, bit error rate(BER) performance, and spectral efficiency. Because it is inevitable to use the HPA to obtain sufficient transmission power for high-speed communication, it is necessary to compensate for nonlinearity of the HPA by using a predistorter. In this study, a predistorter was used to compensate for the nonlinearity of the HPA, and the nonlinear distortion was compensated using the predistorter. Simulation results show that the compensation of the nonlinearity of the HPA using the predistorter achieves a BER performance similar to that of an ideal linear amplifier, and that the spectral mask is also satisfied.

A Study on the Performance of Digital Subscriber Line in Gaussian and Far-end Crosstalk Noises Environment Using Semi-analytic Simulation (Semi-analytic 시뮬레이션을 이용한 가우스 및 원단누화 잡음환경에서의 디지털가입자라인의 BER 성능에 관한 연구)

  • 채윤식;강영홍;이정식;김용환;조평동
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 1999.11a
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    • pp.390-394
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    • 1999
  • In this paper, we have evaluated BER performance of digital subscriber line(DSL) using the twisted-pair channel model by means of Semi-analytic simulation technique. As a result, it was known that the Semi-analytic simulation was proved to be a good technique because of the attenuation of 0.5dB. To keep the BER=10$\^$-7/, 4dB of E$\^$b//N$\^$0/ is needed more when the DSL length extends to 5000m, while 2dB increase of E$\^$b//N$\^$0/ is required when Nyquist frequency goes to 512kb/s with the keeping same distance. In addition, the effect by FEXT noise is serious, when the FEXT noise damping constant, k is over 10/sup-10/ in DSL length and 10$\^$-14/ in the aspect of Nyquist frequency. As the basic, results of this analysis can be used in setting in internal and external standardization of DSL system in the future.

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High-Performance Time-Code Diversity Scheme for Shore-to-Sea Maritime Visible-Light Communication

  • Kim, Hyeongji;Sewaiwar, Atul;Chung, Yeon-Ho
    • Journal of the Optical Society of Korea
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    • v.19 no.5
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    • pp.514-520
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    • 2015
  • This paper presents a novel shore-to-sea maritime data transmission system based on time-code diversity, using visible light in maritime environments to overcome the limitations of conventional maritime wireless communications. The proposed system is primarily comprised of existing LED-based lighthouses and maritime transceivers (marine beacons, buoys, etc.), and thus is considered cost-effective in terms of implementation. We first analyze maritime visible-light communications on the basis of the unique properties of a maritime environment, i.e. sea states (wave height, wind speed, etc.), plus atmospheric turbulence, using the Pierson-Moskowitz (PM) and JONSWAP (JS) spectrum models. It is found that the JS model outperforms the PM model, and that the coverage distance depends on the LED power and sea states. To combat maritime fading conditions that significantly degrade performance and coverage distance, we propose a time-code diversity (TCD) scheme in which the delayed versions of the original data are retransmitted using orthogonal Walsh codes. This TCD scheme is found to be superior, in that it offers three orders of magnitude in terms of BER performance, compared to a conventional (non-TCD) transmission scheme. The proposed scheme is robust and efficient in overcoming the effect of impairments present in maritime environments with a BER of approximately $10^{-5}$and a data rate of 100 Kbps at a distance of 1 km.

Advanced Rake Receiver for Multiple Access M-ary Modulation UWB System in the IEEE Multipath Channel (IEEE 다중경로 채널에서 다중접속 M진 변조 초광대역 시스템을 위한 개선된 Rake 수신기)

  • An, Jinyoung
    • Journal of the Institute of Electronics and Information Engineers
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    • v.51 no.12
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    • pp.12-19
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    • 2014
  • In this paper, an advanced UWB (ultra wideband) Rake receiving technique based on the statistical distribution model is studied in the M-ary TH-PPM system with multiple access interference (MAI). In order to improve the performance of the Rake receiver, the stochastic model, which can flexibly express the behavior of MAI-plus-noise, is required and the Laplace distribution and the generalized normal Laplace (GNL) model applied by the curtosis matching method are considered. The performance of Rake receiver based on each probability distribution is evaluated in the IEEE multipath fading channel and compared to that of the conventional Rake receiver. The suggested approach shows a superior BER performance than that of conventional Rake receiver.

Development of a Robust Multiple Audio Watermarking Using Improved Quantization Index Modulation and Support Vector Machine (개선된 QIM과 SVM을 이용한 공격에 강인한 다중 오디오 워터마킹 알고리즘 개발)

  • Seo, Ye-Jin;Cho, San-Gjin;Chong, Ui-Pil
    • Journal of the Institute of Convergence Signal Processing
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    • v.16 no.2
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    • pp.63-68
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    • 2015
  • This paper proposes a robust multiple audio watermarking algorithm using improved QIM(quantization index modulation) with adaptive stepsize for different signal power and SVM(support vector machine) decoding model. The proposed algorithm embeds watermarks into both frequency magnitude response and frequency phase response using QIM. This multiple embedding method can achieve a complementary robustness. The SVM decoding model can improve detection rate when it is not sure whether the extracted data are the watermarks or not. To evaluate robustness, 11 attacks are employed. Consequently, the proposed algorithm outperforms previous multiple watermarking algorithm, which is identical to the proposed one but without SVM decoding model, in PSNR and BER. It is noticeable that the proposed algorithm achieves improvements of maximum PSNR 7dB and BER 10%.

Data Transmission Rate Improvement Scheme in Power Line Communication System for Smart Grid (스마트 그리드를 위한 전력선 통신 시스템에서의 데이터 전송률 향상 기법)

  • Kim, Yo-Cheol;Bae, Jung-Nam;Kim, Yoon-Hyun;Kim, Jin-Young
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.35 no.12B
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    • pp.1183-1191
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    • 2010
  • In this paper, I propose an adaptive OFDM CP length algorithm for in PLC systems for smart grid. The proposed scheme calculates the channel delay information at the CP controller of the receiver by taking correlation between a received data frame and the following delayed one. The CP controller, immediately, feeds back the channel delay information to the transmitter. Then, the transmitter adapts CP length for next data frame. As an impulsive noise model, Middleton Class A interference model was employed. The performance is evaluated in terms of packet data rate, cumulative packet data rate, and bit error rate (BER). The simulation results showed data gain (which is the amount of the reduced bits) gets larger as the number of packets increase, but the amount of data gain reduced as the number of branches ($N_{br}$) increase. In respects of BER for the cases $N_{br}$ is 3, 4, and 5, performance of the adaptive CP length algorithm and the fixed CP scheme are similar. Therefore, it is confirmed the proposed scheme achieved data rate increment without BER performance reduction compared to the conventional fixed CP length scheme.