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Повышение энергетической эффективности систем сигналов на основе SEFDM и Ð¿Ð¾Ð¼ÐµÑ Ð¾ÑƒÑÑ‚Ð¾Ð¹Ñ‡Ð¸Ð²Ð¾Ð³Ð¾ кодирования путем выбора скорости кода и коэффициента уплотнения

магистерская диссертация

Повышение энергетической эффективности систем сигналов на основе SEFDM и Ð¿Ð¾Ð¼ÐµÑ Ð¾ÑƒÑÑ‚Ð¾Ð¹Ñ‡Ð¸Ð²Ð¾Ð³Ð¾ кодирования путем выбора скорости кода и коэффициента уплотнения

Abstract

Диссертация посвящена исследованию Ð¼Ð½Ð¾Ð³Ð¾Ñ‡Ð°ÑÑ‚Ð¾Ñ‚Ð½Ñ‹Ñ ÑÐ¸Ð³Ð½Ð°Ð»Ð¾Ð² с неортогональным частотным уплотнением (SEFDM) в сочетании с Ð¿Ð¾Ð¼ÐµÑ Ð¾ÑƒÑÑ‚Ð¾Ð¹Ñ‡Ð¸Ð²Ñ‹Ð¼ кодированием на примере сверточного кода и турбо-кода LTE. Сравнивается Ð¿Ð¾Ð¼ÐµÑ Ð¾ÑƒÑÑ‚Ð¾Ð¹Ñ‡Ð¸Ð²Ð¾ÑÑ‚ÑŒ SEFDM- и OFDM-сигналов с кодированием и без кодирования при условии обеспечения одинаковой спектральной эффективности. Для турбо-кода LTE исследуются шаблоны выкалываний для реализации набора Ñ‚Ñ€ÐµÐ±ÑƒÐµÐ¼Ñ‹Ñ ÑÐºÐ¾Ñ€Ð¾ÑÑ‚ÐµÐ¹ кодирования с малой дискретностью. Показано, что при сравнении с OFDM-сигнала без кодирования для эквивалентного SEFDM-сигнала может быть найдено значение коэффициента частотного уплотнения, обеспечивающего лучшую Ð¿Ð¾Ð¼ÐµÑ Ð¾ÑƒÑÑ‚Ð¾Ð¹Ñ‡Ð¸Ð²Ð¾ÑÑ‚ÑŒ. При сравнении с OFDM-сигналом с кодированием, кривые Ð¿Ð¾Ð¼ÐµÑ Ð¾ÑƒÑÑ‚Ð¾Ð¹Ñ‡Ð¸Ð²Ð¾ÑÑ‚Ð¸ SEFDM-сигнала показывают Ñ ÑƒÐ´ÑˆÐ¸Ðµ результаты, что ограничивает применение данной Ñ‚ÐµÑ Ð½Ð¾Ð»Ð¾Ð³Ð¸Ð¸.

The combination of multicarrier signals with nonorthohgonal frequency spacing (spectrally efficient frequency division multiplexing, SEFDM) and forward error correction (FEC) schemes is analyzed for LTE convolutional and turbo codes. BER performance of coded and uncoded OFDM and SEFDM is considered while keeping the spectral efficiency constant. Also puncturing patterns are selected for providing different code rates of the LTE turbo-code encoder with very small step size. It is shown that compared with uncoded OFDM the best value of SEFDM compression factor providing better BER performance can be found. But for coded OFDM coded SEFDM always performs worse due to waterfall behaviour of BER curves, thus restricting the application borders of SEFDM.

Keywords

Радиосигналы, Кодирование Ð¿Ð¾Ð¼ÐµÑ Ð¾ÑƒÑÑ‚Ð¾Ð¹Ñ‡Ð¸Ð²Ð¾Ðµ, шаблоны выкалываний, templates puncturing

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
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