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    Wyświetlanie 1-3 z 3
    Tytuł:
    Permutation Coding with Injections for Modified PAM System
    Autorzy:
    Ogunyanda, Opeyemi O.
    Shongwe, Thokozani
    Swart, Theo G.
    Powiązania:
    https://bibliotekanauki.pl/articles/226518.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    injection
    permutation codes
    power line communications
    pulse amplitude modulation
    jitter
    Opis:
    Arriving at a good combination of coding and modulation schemes that can achieve good error correction constitutes a challenge in digital communication systems. In this work, we explore the combination of permutation coding (PC) and pulse amplitude modulation (PAM) for mitigating channel errors in the presence of background noise and jitter. Since PAM is characterised with bi-polar constellations, Euclidean distance is a good choice for predicting the performance of such coded modulation setup. In order to address certain challenges facing PCs, we therefore introduce injections in the coding system, together with a modified form of PAM system. This modification entails constraining the PAM constellations to the size of the codeword’s symbol. The results obtained demonstrate the strength of the modified coded PAM system over the conventional PC coded PAM system.
    Źródło:
    International Journal of Electronics and Telecommunications; 2020, 66, 3; 399-404
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance Comparison of Modified BPSK-OFDM and QFSK-OFDM in PLC Channel Noise
    Autorzy:
    Bolaji, Abiola G.
    Shongwe, Thokozani
    Powiązania:
    https://bibliotekanauki.pl/articles/1844463.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    narrow-band Interference
    impulsive noise
    power line communications
    BPSK-OFDM
    QFSK-OFDM
    Opis:
    The article describes and compares two OFDM based communications schemes for reducing the effects of the combination of Narrowband Interference (NBI) and Impulsive Noise (IN), which are noise types typical in Power Line Communication (PLC). The two schemes are Modified BPSK-OFDM (called MBPSK, for brevity) and QFSK-OFDM (called QFSK, for brevity), which are non-conventional OFDM schemes. We give a description of the two schemes, showing how they are derived and also show their similarities and eventually compare their performances. Performance simulation results, in terms of bit error rate, are given to compare the systems under the effect of IN and NBI. The popular Middleton Class A model is used for modelling IN. The results show that MBPSK scheme outperforms the QFSK scheme in terms of minimum distance, and hence in terms of bit error probability when no preprocessing is performed. However, under clipping/nulling, both schemes eventually reach the bit error rate floor.
    Źródło:
    International Journal of Electronics and Telecommunications; 2020, 66, 4; 599-605
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-Rate Permutation Coding with Unequal Error Protection
    Autorzy:
    Ogunyanda, Kehinde
    Swart, Theo G.
    Ogunyanda, Opeyemi O.
    Powiązania:
    https://bibliotekanauki.pl/articles/2055239.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    channel coding
    high-rate codes
    permutation codes
    power line communications
    unequal error protection
    Opis:
    Channel coding provides numerous advantages to digital communications. One of such advantages is error correcting capabilities. This, however, comes at the expense of coding rate, which is a function of the codebook’s cardinality |C| or number of coded information bits and the codeword length M. In order to achieve high coding rate, we hereby report a channel coding approach that is capable of error correction under power line communications (PLC) channel conditions, with permutation coding as the coding scheme of choice. The approach adopts the technique of unequal error correction for binary codes, but with the exception that non-binary permutation codes are employed here. As such, certain parts of the information bits are coded with permutation symbols, while transmitting other parts uncoded. Comparisons with other conventional permutation codes are presented, with the proposed scheme exhibiting a relatively competitive performance in terms of symbol error rate.
    Źródło:
    International Journal of Electronics and Telecommunications; 2022, 68, 1; 27--33
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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