rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Impulsive noise mitigation in wavelet based orthogonal frequency division multiplexing systems
  name:
    name part: Ali, Maaz Elhag
    role:
      role term: creator
  name:
    name part: International Islamic University Malaysia
    name part: Department of Electrical and Computer Engineering
  genre: Theses, IIUM local
  origin info:
    place:
      place term: my
    place:
      place term: Kuala Lumpur
    publisher: Kulliyyah of Engineering, International Islamic University Malaysia
    date issued: 2014
  language:
    language term: eng
  physical description:
    extent: xviii, 147 leaves : ill. ; 30cm.
  abstract: Multicarrier Modulation (MCM) is a widely used modulation scheme in broadband communications. It is superior to ordinary Single Carrier (SC) technique in terms of data rate, combating multipath and eliminating the effect of intersymbol interference (ISI) without using complex equalizers. The most common MCM scheme is Orthogonal Fre- quency Division Multiplexing (OFDM) and can be implemented using the Fast Fourier Transform (FFT) for modulation and demodulation. Wavelet-based OFDM as an al- ternative scheme to Fourier-OFDM has been recently adopted in some standards such as the IEEE 1901. This thesis is mainly about mitigating impulsive noise in wavelet- OFDM systems and this was achieved by using two mitigation techniques. The first method was by using blanking technique which is a common technique used in FFT- OFDM systems. This technique was used to mitigate the impulsive noise in all wavelet families under study which were Haar, Daubechies-4 and biorthogonal-4.4. The second technique, the replacing technique, was proposed and developed based on the mathe- matical analysis of the Haar discrete wavelet transform-OFDM. A redundancy in data was found and exploited to mitigate the impulsive noise. However, the performance of both techniques is highly dependent on the selection of threshold values. The results of the first technique showed that all wavelet types have approximately similar BER performance except the Haar wavelet family which had superior BER performance in most cases. Under the assumption of Bernoulli-Gaussian model for impulsive noise and BPSK-OFDM scheme, it was found that both techniques could achieve performance of BER of 1 × 10−4 with 5 dB gain in SNR when the probability of impulsive noise oc- currence ( p = 0.001). Achieving higher performance requires lowering the probability of occurrence. However, Assuming that there is an improper setting of the threshold value below or near the signal level, the replacing technique showed more immunity to er…
  note: by Maaz Elhag Ali
  note: Thesis (MSCE)--International Islamic University Malaysia, 2014.
  note: Includes bibliographical references (leaves 131-135).
  subject:
    geographic code: a-my---
  classification: TK5103.484
  identifier: http://studentrepo.iium.edu.my/handle/123456789/4885
  record info:
    record content source: UIAM
    record creation date: 140409
    language of cataloging:
      language term: eng