
ДиÑÑÐµÑ€Ñ‚Ð°Ñ†Ð¸Ñ Ð¿Ð¾ÑвÑщена иÑÑледованию многочаÑÑ‚Ð¾Ñ‚Ð½Ñ‹Ñ Ñигналов Ñ Ð½ÐµÐ¾Ñ€Ñ‚Ð¾Ð³Ð¾Ð½Ð°Ð»ÑŒÐ½Ñ‹Ð¼ чаÑтотным уплотнением (SEFDM) в Ñочетании Ñ Ð¿Ð¾Ð¼ÐµÑ Ð¾ÑƒÑтойчивым кодированием на примере Ñверточного кода и турбо-кода LTE. СравниваетÑÑ Ð¿Ð¾Ð¼ÐµÑ Ð¾ÑƒÑтойчивоÑть SEFDM- и OFDM-Ñигналов Ñ ÐºÐ¾Ð´Ð¸Ñ€Ð¾Ð²Ð°Ð½Ð¸ÐµÐ¼ и без ÐºÐ¾Ð´Ð¸Ñ€Ð¾Ð²Ð°Ð½Ð¸Ñ Ð¿Ñ€Ð¸ уÑловии обеÑÐ¿ÐµÑ‡ÐµÐ½Ð¸Ñ Ð¾Ð´Ð¸Ð½Ð°ÐºÐ¾Ð²Ð¾Ð¹ Ñпектральной ÑффективноÑти. Ð”Ð»Ñ Ñ‚ÑƒÑ€Ð±Ð¾-кода LTE иÑÑледуютÑÑ ÑˆÐ°Ð±Ð»Ð¾Ð½Ñ‹ выкалываний Ð´Ð»Ñ Ñ€ÐµÐ°Ð»Ð¸Ð·Ð°Ñ†Ð¸Ð¸ набора Ñ‚Ñ€ÐµÐ±ÑƒÐµÐ¼Ñ‹Ñ ÑкороÑтей ÐºÐ¾Ð´Ð¸Ñ€Ð¾Ð²Ð°Ð½Ð¸Ñ Ñ Ð¼Ð°Ð»Ð¾Ð¹ диÑкретноÑтью. Показано, что при Ñравнении Ñ OFDM-Ñигнала без ÐºÐ¾Ð´Ð¸Ñ€Ð¾Ð²Ð°Ð½Ð¸Ñ Ð´Ð»Ñ Ñквивалентного SEFDM-Ñигнала может быть найдено значение коÑффициента чаÑтотного уплотнениÑ, обеÑпечивающего лучшую Ð¿Ð¾Ð¼ÐµÑ Ð¾ÑƒÑтойчивоÑть. При Ñравнении Ñ OFDM-Ñигналом Ñ ÐºÐ¾Ð´Ð¸Ñ€Ð¾Ð²Ð°Ð½Ð¸ÐµÐ¼, кривые Ð¿Ð¾Ð¼ÐµÑ Ð¾ÑƒÑтойчивоÑти SEFDM-Ñигнала 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.
РадиоÑигналÑ, ÐодиÑование Ð¿Ð¾Ð¼ÐµÑ Ð¾ÑÑÑойÑивое, ÑÐ°Ð±Ð»Ð¾Ð½Ñ Ð²ÑкалÑваний, templates puncturing
РадиоÑигналÑ, ÐодиÑование Ð¿Ð¾Ð¼ÐµÑ Ð¾ÑÑÑойÑивое, ÑÐ°Ð±Ð»Ð¾Ð½Ñ Ð²ÑкалÑваний, templates puncturing
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