• Title/Summary/Keyword: bit error rate

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Performance Analysis of IEEE 802.11b under IEEE 802.15.4 Environment (IEEE 802.15.4 환경 하에서의 IEEE 802.11b의 성능 해석)

  • Yoon, Dae-Kil;Shin, Soo-Young;Kwon, Wook-Hyun;Kim, Jung-Jun;Kim, Young-Ho;Shin, Young-Hee
    • 한국정보통신설비학회:학술대회논문집
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    • 2005.08a
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    • pp.85-91
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    • 2005
  • Coexistence of different wireless systems that share the 2.4 GHz ISM frequency band is becoming one of the most important issue. This paper presents a model of the interference that IEEE 802.11b may experience because of IEEE 802.15.4. The packet error rate (PER) of IEEE 802.11b under the interference of IEEE 802.15.4 is analyzed. The PER is obtained by using the bit error rate (BER) and the collision time. The analytical results are validated using simulation.

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A lower bound of bit error rate of chip asynchronous Pattern codes in 2-dimensional optical CDMA system (2차원 광부호분할 다중접속 시스템에서 칩 비동기 패턴부호의 비트오류율 하한값 유도)

  • Lee, Tae-Hoon;Park, Young-Jae;Park, Jin-Bae
    • Proceedings of the KIEE Conference
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    • 1999.07g
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    • pp.3239-3241
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    • 1999
  • Two-dimensional optical code-division multiple access is a system to transmit a two- dimensional data via parallel transmission line. The probability density function (pdf) of interference noise from other users is calculated and the pdf of asynchronous interference noise is newly calculated to present lower bounds of probability of error. The corresponding bit error rate is evaluated from this results.

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Video Watermarking Algorithm using the Frame-dependent Key (프레임에 기반한 키를 이용한 동영상 워터마킹)

  • 안일영;박성한
    • Journal of Broadcast Engineering
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    • v.8 no.4
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    • pp.501-504
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    • 2003
  • In this out watermarking method, a key is determined by quantizing the maximum motion difference between frames. We have a problem the key value for embedding and detection are different in 1 to 3% frames of all frames. This problem can be easily solved by using a new key according to bit error rate of the extracted watermark. Since the watermark is embedded in each frame nth different keys and detected In all the frames, out method is resistant against attacks such as the frame averaging and frame drop.

The Study on Nonlinear Compensation Characteristics of Multi-tap Update Algorithm in Broadband PCS Channel

  • Lee, Seung-Dae
    • Journal of the Korea Computer Industry Society
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    • v.9 no.2
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    • pp.77-82
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    • 2008
  • The diversity reception and the equal gain combining technique are applied to the compensation of the distortion of channel, which occurs in transmission of data at rapid speed. DSSS BPSK system which has the receiving structure with the compensation algorithm is formed on the diversity branch, and the characteristics of the system are evaluated at the view point of the average bit error rate due to the SNR. In addition, the multi-tap update algorithm which is superior for the data compensation is suggested. Moreover, using the American Joint Technical Committee PCS RF channel characterization and system deployment model standard, the suggested multi-tap update algorithm is compared and analyzed with the view-point of the average bit error rate and convergence speed for evaluating the realistic efficiency of the system.

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Asymptotic Performance Analysis of Free-Space Optical Links with Transmit Diversity

  • Feng, Jianfeng;Zhao, Xiaohui
    • Journal of the Optical Society of Korea
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    • v.20 no.4
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    • pp.451-463
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    • 2016
  • The misalignment errors and fluctuations in irradiance due to atmospheric turbulence can severely degrade the performance of free-space optical (FSO) systems. In this paper, we investigate the asymptotic bit error rate (BER) performance and diversity orders of FSO links using parallel transmit-diversity schemes. The BER expressions of FSO links with the switch-and-examine transmit (SET), switch-and-examine transmit with post-selection (SETps), dual-branch transmit laser selection (Dual-TLS), and group transmit laser selection (Group-TLS) schemes are derived, based on an approximate channel model. Then numerical simulations for these four schemes in the region of high average signal-to-noise ratio (SNR) are presented under different channel conditions. The results show that the four transmit-diversity schemes can reduce system complexity and overcome the limitation of peak power, without much BER deterioration.

Performance analysis on the asymmetric watermark using power spectrum domain (파워 스펙트럼 도메인 비대칭 워터마크의 성능 분석)

  • 서진수;유창동
    • Journal of the Institute of Electronics Engineers of Korea CI
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    • v.40 no.3
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    • pp.164-170
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    • 2003
  • This paper proposes a novel method to detect Furon's asymmetric watermark by using a correlation detector that is mathematically tractable and simple. The performance of the proposed method is tested under various conditions. The experimental results matched the theoretical results well, showing that the correlation detector can indeed be used for the detection of asymmetric watermark. The proposed detector is aplied to both single and multiple bit embedded watermark. Bit error rate (BER), obtained from the experiment, was compared to the one obtained from the theory. As the embedded information increases, the BER of the Furon's asymmetric watermarking method also increases rapidly.

A Study on the Multi-Tap Update Algorithm in Time Variant Channel Model (시변채널 모델에서 다중 탭 갱신 알고리즘에 관한 연구)

  • Lee Seung-Dae
    • Journal of the Korea Computer Industry Society
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    • v.7 no.1
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    • pp.39-46
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    • 2006
  • Multipath diversity reception is applied to the compensation of the distortion of channel, which occurs in transmission of data at rapid speed. DS/BPSK systems are composed of the equipment with reception structure combined with a compensation algorithm to diversity branch. The efficiency of the system is evaluated from the point of view of average bit error rate according to SNR. In order to remove intersymbol interference, this algorithm is applied to time-invariant channel at every diversity branch with the number of L. As a result, the average bit error rate is saturated by $10^{-2}$ at the conventional compensation algorithm.

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A DSP Implementation of the BICM Module for DVB-T2 Receivers (DVB-T2 수신기를 위한 BICM 모듈의 DSP 구현)

  • Lee, Jae-Ho
    • Journal of Advanced Navigation Technology
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    • v.15 no.4
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    • pp.591-595
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    • 2011
  • In this paper, we design the hardware architecture of the BICM(Bit Interleaved Coded Modulation) module for next generation European broadcast system and implement the BICM module with DSP(Digital Signal Processor) TMS320C6474. Simulation result shows that the BER(Bit Error Rate) performance of the fixed-point BICM module using more than 8 bits is very similar to that of the floating-point BICM module.

Optimal Parameter Estimation of the ML Test Based Audio Watermark Decoder (ML 시험 기반 오디오 워터마크 디코더의 최적 변수추정)

  • Lee, Jin-Geol
    • The Journal of the Acoustical Society of Korea
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    • v.25 no.2
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    • pp.56-60
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    • 2006
  • Based on the fact that audio signals in the time domain have the generalized Gaussian distribution. an optimal parameter estimation of the ML (maximum likelihood) test based audio watermark decoder. which leads to the minimal bit error rate, is Proposed. Its superiority of performance over the existing estimation and the conventional correlation based decoder is demonstrated experimentally.

Bit Error Characteristics of Passive Phase Conjugation Underwater Acoustic Communication Due to a Drifting Source

  • Lin Chun-Dan;Ro Yong Ju;Rouseff Daniel;Yoon Jong Rak
    • The Journal of the Acoustical Society of Korea
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    • v.24 no.2E
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    • pp.61-66
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    • 2005
  • Experimental work in underwater acoustic communications using passive phase conjugation has shown that the demodulation error depends on the relative drift rate between the source and receiver [Rouseff et al., IEEE J. Oceanic Eng. 26, 821-831 (2001)]. The observed effect involves the mismatch between the initial impulse response and the subsequent response after the source or receiver has changed locations. In the present work, the effect of drifting source is analyzed by numerical simulations and compared to the experimental results. The communications bit error rate is qualified as a function of drift rate, drifting direction, and source-receiver range.