Нейросетевой эквалайзер на PlutoSDR: от синтетики к железу

Любой реальный радиоканал «размазывает» символы во времени: соседние отсчёты накладываются друг на друга, и приёмник видит межсимвольную интерференцию (ISI). Классический способ с этим бороться — адаптивный фильтр LMS. Он прост, дёшев и хорошо работает, пока канал близок к линейному. Но это именно линейный фильтр: когда лучей несколько и у них разные фазы, одной линейной комбинацией отсчётов идеально восстановить символ уже не получается. Отсюда идея, которую я и проверял: заменить (или дополнить) LMS компактной свёрточной сетью. Сеть смотрит не на один отсчёт, а на целое окно принятого сигнала и учится по нему обратному отображению канала — то есть восстанавливать исходную точку созвездия с учётом совместной статистики соседних символов. Сначала всё это обучается и сравнивается на синтетике, а потом проверяется на настоящем железе — модуле ADALM‑PLUTO.

https://habr.com/ru/articles/1048700/

#RF #КИХ #кихфильтр #бих #pytorch #tensorflow #радиотехника

Нейросетевой эквалайзер на PlutoSDR: от синтетики к железу

Зачем вообще трогать LMS Любой реальный радиоканал «размазывает» символы во времени: соседние отсчёты накладываются друг на друга, и приёмник видит межсимвольную интерференцию (ISI). Классический...

Хабр
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