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О методах синхронизации в одночастотных сетях

О методах синхронизации в одночастотных сетях

Abstract

Представлен анализ методов кадровой синхронизации при приеме сигнала от нескольких передатчиков, объединенных в одночастотную вещательную сеть. Рассмотрены модели и структурные схемы кадровой синхронизации методами максимального правдоподобия и корреляции для OFDM системы с одной передающей станцией. Предложена расширенная модель синхронизации для двух передающих станций объединенных в одночастотную сеть. Для предложенной модели исследовано влияния относительного сдвига частоты и относительного временного сдвига на величину отношения сигнал-шум принимаемого сигнала. Проведен сравнительный анализ качества синхронизации и отношения сигнал-шум для рассмотренных методов в канале с АБГШ и доплеровским сдвигом частоты. На временных диаграммах представлено численное моделирование и показана средняя величина отклонения временной синхронизации для разных случаев приема.

Keywords

ОДНОЧАСТОТНЫЕ СЕТИ,КАДРОВАЯ СИНХРОНИЗАЦИЯ,МЕТОД МАКСИМАЛЬНОГО ПРАВДОПОДОБИЯ,ОТНОСИТЕЛЬНОГО СДВИГА ЧАСТОТЫ,ОТНОСИТЕЛЬНЫЙ ВРЕМЕННОЙ СДВИГ

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    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.
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    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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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
gold