نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار گروه پژوهشی کامپیوتر و فناوری اطلاعات، پژوهشگاه علوم و تکنولوژی پیشرفته و علوم محیطی، دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته

2 کارشناس ارشد، مهندسی برق-مخابرات، شرکت مخابرات استان کرمان-سیرجان

چکیده

عملکرد کانال های مخابرات خطوط قدرت و مخابرات زیرآب تحت تاثیر پدیده های مخرب محوشوندگی، تضعیف، انتشار چندمسیره و نویز ضربه ای می باشد. روش معمول غلبه بر این محدودیت ها، استفاده از مدولاسیون تقسیم فرکانسی متعامد مبتنی بر تبدیل فوریه می باشد. اما این مدولاسیون از محدودیت هایی همچون کارآیی پهنای باند پایین و نسبت بالای توان ماکزییم به توان متوسط برخوردار است. با توجه به قابلیت های مدولاسیون تقسیم فرکانسی متعامد مبتنی بر تبدیلات ویولت در غلبه بر این محدودیت ها و عدم وجود دانش کافی در ارتباط با عملکرد آن در کانال های متأثر از نویز ضربه ای، این مقاله مبتنی بر پیشنهاد این روش مدولاسیون برای کانال های مخابرات خطوط قدرت و مخابرات زیرآب می باشد و عملکرد آن برای خانواده های مختلف تبدیلات ویولت در حضور تکنیک های مقابله با نویز و بر مبنای مدل های جامع کانال و نویز مورد ارزیابی قرار می گیرد. بر مبنای نتایج نشان داده می شود که مدولاسیون تقسیم فرکانسی متعامد مبتنی بر تبدیلات ویولت ضمن افزایش کارایی پهنای باند، از عملکرد بهتری از منظر پارامترهای نسبت توان ماکزییم به توان متوسط و نرخ خطای بیت در این کانال ها نیز برخوردار است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Performance Improvement of FFT-OFDM for Impulsive Noise Communications Channels Using Wavelet Transforms and Noise Mitigation Methods

نویسندگان [English]

  • Mohsen Sheikh-Hosseini 1
  • Sarvar Ebrahimi Meymand 2

1 1Dept. of Computer and Information Technology, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran

2 2Master of Science, Electrical Engineering-Communications, at Kerman Province Telecommunication Company of Iran

چکیده [English]

Performance of Power Line Communications (PLC) and Underwater Acoustic Communications (UWA) Channels is affected by limiting factors of fading, attenuation, multipath propagation and impulsive noise. Classically, Fourier-Based Orthogonal frequency division multiplexing (OFDM) modulation is utilized to overcome these limitations. However, this modulation suffers from some drawbacks like low spectral efficiency and high peak to average power ratio. Due capability of wavelet-based OFDM in overcoming these limitations and also lack of sufficient knowledge about its performance in impulsive noise channels, this paper is devoted to suggest wavelet-based OFDM for PLC and UWA Channels and evaluates its performance for different wavelet families in the presence of impulsive noise mitigation methods and general models of channel and noise. The results demonstrate that wavelet-based OFDM not only increases spectrum efficiency in comparison with Fourier-Based OFDM, but also provides better performance in the terms of average bit error rate and high peak to average power ratio.

کلیدواژه‌ها [English]

  • Wavelet and Fourier Transforms
  • Power Line Communications (PLC)
  • Underwater Acoustic Communications
  • Orthogonal Frequency Division multiplexing (OFDM) Modulation
  • Bernoulli-Gaussian and Middleton Class A Impulsive Noise Models

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