• Title/Summary/Keyword: bit error rate

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Experimental Results of an Underwater Acoustic Communications using BPSK Modulation (BPSK 변조를 이용한 수중 음향 통신의 실험적 고찰)

  • Ju, Hyung-Jun;Jeon, Jae-Kuk;Kim, Ki-Man
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2005.06a
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    • pp.454-458
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    • 2005
  • In this paper we analyzed the performance of data transmission using BPSK modulation. The system performances were evaluated by the experiments in water tank. As a result we showed the influences of reverberation due to the multipath. In order to simplify the experiment procedure the channel coding etc. were omitted. The experimental result shows that the maximum transmission data rate in used water tank is about 350 bps at bit error rate of $10^{-3}$.

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Communication-Theoretic Analysis of Capture-Based Networks

  • Nguyen, Gam D.;Wieselthier, Jeffrey E.;Ephremides, Anthony
    • Journal of Communications and Networks
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    • v.14 no.3
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    • pp.243-251
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    • 2012
  • Under the power-based capture model, a transmission is successfully received at the destination, even in the presence of other transmissions and background noise, if the received signal-to-interference-plus-noise ratio exceeds a capture threshold. We evaluate the spectral efficiency of simple multi-user channels by combining the basic capture model with a communication-theoretic model. The result is a more refined capture model that incorporates key system design parameters (such as achievable bit rate, target bit error rate, channel bandwidth, and modulation signal constellations) that are absent from the basic capture model. The relationships among these parameters can serve as a tool for optimizing the network performance.

Bit Error Rate of Systems Using Pulse Shaping Filters with a Transmission Bandwidth Reduction (펄스 성형 필터를 사용하는 시스템에서 전송대역폭의 감소에 따른 비트 오율)

  • Chung, Young-Mo
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2010.07a
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    • pp.278-280
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    • 2010
  • 본 논문에서는 채널의 전송대역폭이 제한되는 환경에서 성형 펄스로 RTPZD(root trapezoidal), RBTRC(root better than raised-cosine), 그리고 RRC(root raised-cosine)를 적용한 시스템의 BER(bit error rate) 성능을 컴퓨터 모의실험을 통하여 비교 분석하였다. 실험 결과 RBTRC는 RTPZD를 적용한 시스템보다 채널의 대역폭 제한에 더욱 민감하여, 채널의 전송대역 폭이 협소하여짐에 따라 RBTRC를 적용한 시스템의 BER 성능이 RTPZD의 성능보다 더 큰 폭으로 저하됨을 관찰할 수 있었 다. RBTRC 펄스는 심볼 타이밍 오차에 다른 성형 펄스보다 덜 민감한 장점이 있지만, 대역제한된 채널에서는 성능 저하가 크므로 성형 펄스로 RTPZD 또는 RRC 펄스를 적용하는 것이 더 유리하다고 판단된다.

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Minimum BER Power Allocation for OFDM-based Cognitive Radio Networks

  • Xu, Ding;Li, Qun
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.9 no.7
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    • pp.2338-2353
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    • 2015
  • In this paper, the optimal power allocation algorithm that minimizes the aggregate bit error rate (BER) of the secondary user (SU) in a downlink orthogonal frequency division multiplexing (OFDM) based cognitive radio (CR) system, while subjecting to the interference power constraint and the transmit power constraint, is investigated under the assumption that the instantaneous channel state information (CSI) of the interference links between the secondary transmitter and the primary receiver, and between the primary transmitter and the secondary receiver is perfectly known. Besides, a suboptimal algorithm with less complexity is also proposed. In order to deal with more practical situations, we further assume that only the channel distribution information (CDI) of the interference links is available and propose heuristic power allocation algorithms based on bisection search method to minimize the aggregate BER under the interference outage constraint and the transmit power constraint. Simulation results are presented to verify the effectiveness of the proposed algorithms.

Detection of FSK and Bit error rate using a first-order Digital PLL (1차 Digital PLL을 이용한 FSK 복조 및 BIT ERROR RATE 측정)

  • Chung, Hyun-Gi;Park, Ju-Ho;Joo, Jung-Kyu;Shim, Soo-Bo
    • Proceedings of the KIEE Conference
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    • 1987.07b
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    • pp.874-877
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    • 1987
  • In this paper a DPLL circuit realizable by digital IC's is propose and the principles of general DPLL are described. An all Digital phase locked loop is designed, analyzed, and tested. In particular, the approach of invoking Gaussian assumption on the decision variable and based on S.O.Rices theory is used. As a performance of the above PLL detector operating on low data rate FSK is given and demonsrtated to be FSK reception.

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BER for Single-bit Error-correcting Code (Single-bit Error-correcting Code 에 대한 BER)

  • Fuwen Pang;Hwang, Sang-Ku;Hong, Tchang-Hee
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2000.05a
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    • pp.210-216
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    • 2000
  • The features of bit error rate (BER) are discussed, how to analyze statistics of the bit error rate. How many will the BER be improved after correcting one single-error in the block\ulcorner The answer is satisfactory in this paper.

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Performance Analysis of MCDD in an OBP Satellite Communications System

  • Kim, Sang-Goo;Yoon, Dong-Weon
    • Journal of Communications and Networks
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    • v.12 no.6
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    • pp.529-532
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    • 2010
  • Multi-carrier demultiplexer/demodulator (MCDD) in an on-board processing (OBP) satellite used for digital multimedia services has two typical architectures according to the channel demultiplexing procedure: Multistage multi-carrier demultiplexer (M-MCD) or poly-phase fast Fourier transform (PPF). During the channel demultiplexing, phase and quantization errors influence the performance of MCDD; those errors affect the bit error rate (BER) performance of M-MCD and PPF differently. In this paper, we derive the phase error variances that satisfy the condition that M-MCD and PPF have the same signal to noise ratio according to quantization bits, and then, with these results, analyze the BER performances of M-MCD and PPF. The results provided here may be a useful reference for the selection of M-MCD or PPF in designing the MCDD in an OBP satellite communications system.

Analysis on Bit Error Rate Performance of Negatively Asymmetric Binary Pulse Amplitude Modulation Non-Orthogonal Multiple Access in 5G Mobile Networks

  • Chung, Kyuhyuk
    • International Journal of Advanced Culture Technology
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    • v.9 no.4
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    • pp.307-314
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    • 2021
  • Recently, positively asymmetric binary pulse amplitude modulation (2PAM) has been proposed to improve the bit error rate (BER) performance of the weak channel gain user, with a tolerable BER loss of the strong channel gain user, for non-orthogonal multiple access (NOMA). However, the BER loss of the stronger channel gain user is inevitable in such positively asymmetric 2PAM NOMA scheme. Thus, we propose the negatively asymmetric 2PAM NOMA scheme. First, we derive closed-form expressions for the BERs of the negatively asymmetric 2PAM NOMA. Then, simulations demonstrate that for the stronger channel gain user, the BER of the proposed negatively asymmetric 2PAM NOMA improves, compared to that of the conventional positively asymmetric 2PAM NOMA. Moreover, we also show that for the weaker channel gain user, the BER of the proposed negatively asymmetric 2PAM NOMA is comparable to that of the conventional positively asymmetric 2PAM NOMA, over the power allocation range less than about 10 %.

Performance Analysis of an AF Dual-hop FSO Communication System with RF Backup Link

  • Alhamawi, Khaled A.;Altubaishi, Essam S.
    • Current Optics and Photonics
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    • v.3 no.4
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    • pp.311-319
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    • 2019
  • A hybrid free-space-optical/radio-frequency (FSO/RF) communication system is considered, with the help of amplify-and-forward (AF) relaying. We consider various weather conditions to investigate their effects on the system's performance. We begin by obtaining the cumulative distribution function and probability density function of the end-to-end signal-to-noise ratio for the AF dual-hop FSO communication system with RF backup link. Then, these results are used to derive closed-form expressions for the outage probability, average bit-error rate, and average ergodic capacity. The results show that the considered system efficiently employs the complementary nature of FSO and RF links, resulting in impressive performance improvements compared to non-hybrid systems.

Performance Analysis of Active Optical Ring Network System for the Efficient Transmission (효율적인 전송을 위한 액티브 광 링네트워크 시스템의 성능 분석)

  • Lee Sang-Wha
    • The Journal of the Korea Contents Association
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    • v.6 no.7
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    • pp.69-78
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    • 2006
  • In this paper, we presents the efficiency and a transmission quality of the system which is composed of the optical elements from physical layer of the active optical ring network. For a simulation it will use the Transmissionmaker WDM and it will be able to observation a optical transmission quality of the optical transmission system. The active optical network is composed of two rings(main ring and sub-ring). It measures the BER(Bit Error Rate) quality which it follows node number from the sub ring and physical distance of the node. Performance analysis from the physical layer becomes the standard of the plan for the efficiency optimization of the active optical ring network. Consequently it will be able to compose the efficient optical transmission system which reflects the physical distance, a traffic demand quantity of each node and a number of users from actual network.

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