title: ÐÐ¾Ð²ÑÑÐµÐ½Ð¸Ðµ ÑÑÑÐµÐºÑÐ¸Ð²Ð½Ð¾ÑÑÐ¸ Ð¼Ð½Ð¾Ð³Ð¾ÑÐ°ÑÑÐ¾ÑÐ½ÑÑ ÑÐ¸ÑÑÐµÐ¼ Ð¿ÐµÑÐµÐ´Ð°ÑÐ¸ Ð¸Ð½ÑÐ¾ÑÐ¼Ð°ÑÐ¸Ð¸. ÐÐ½Ð°Ð»Ð¸Ð· ÑÑÑÐµÐºÑÐ¸Ð²Ð½Ð¾ÑÑÐ¸ ÑÐ°Ð±Ð¾ÑÑ Ð² ÐºÐ°Ð½Ð°Ð»Ð°Ñ Ñ Ð·Ð°Ð¼Ð¸ÑÐ°Ð½Ð¸ÑÐ¼Ð¸
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
title: Fading of OFDM signals
Creators: name: ÐÐ°ÑÐºÐµÐ²Ð¸Ñ, ÐÐ°ÑÐº
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2024
Subjects: Ð¼Ð½Ð¾Ð³Ð¾ÑÐ°ÑÑÐ¾ÑÐ½ÑÐµ ÑÐ¸Ð³Ð½Ð°Ð»Ñ
OFDM
SEFDM
Ð·Ð°Ð¼Ð¸ÑÐ°Ð½Ð¸Ñ
Ð¼ÐµÑÐ¾Ð´Ñ Ð±Ð¾ÑÑÐ±Ñ Ñ Ð·Ð°Ð¼Ð¸ÑÐ°Ð½Ð¸ÑÐ¼Ð¸
ÑÐ½ÐµÑÐ³ÐµÑÐ¸ÑÐµÑÐºÐ°Ñ ÑÑÑÐµÐºÑÐ¸Ð²Ð½Ð¾ÑÑÑ
ÑÐ¿ÐµÐºÑÑÐ°Ð»ÑÐ½Ð°Ñ ÑÑÑÐµÐºÑÐ¸Ð²Ð½Ð¾ÑÑÑ
multifrequency signals
fading
methods of combating
energy efficiency
spectral efficiency

description: ÐÐ°Ð´Ð°ÑÐ¸, ÐºÐ¾ÑÐ¾ÑÑÐµ ÑÐµÑÐ°Ð»Ð¸ÑÑ Ð²Ð¾ Ð²ÑÐµÐ¼Ñ Ð²ÑÐ¿Ð¾Ð»Ð½ÐµÐ½Ð¸Ñ ÑÐ°Ð±Ð¾ÑÑ: 1. ÐÐ½Ð°Ð»Ð¸Ð· Ð¼ÐµÑÐ¾Ð´Ð¾Ð² Ð±Ð¾ÑÑÐ±Ñ Ñ Ð·Ð°Ð¼Ð¸ÑÐ°Ð½Ð¸ÑÐ¼Ð¸ Ð¿ÑÐ¸ Ð¸ÑÐ¿Ð¾Ð»ÑÐ·Ð¾Ð²Ð°Ð½Ð¸Ð¸ OFDM ÑÐ¸Ð³Ð½Ð°Ð»Ð¾Ð².Â  ÐÑÐµÐ½ÐºÐ° ÑÐ»Ð¾Ð¶Ð½Ð¾ÑÑÐ¸ ÑÐµÐ°Ð»Ð¸Ð·Ð°ÑÐ¸Ð¸.Â  ÐÑÐµÐ½ÐºÐ° Ð²Ð»Ð¸ÑÐ½Ð¸Ñ Ð¿ÑÐµÐ´Ð»Ð°Ð³Ð°ÐµÐ¼ÑÑ Ð¼ÐµÑÐ¾Ð´Ð¾Ð² Ð½Ð° ÑÐ¿ÐµÐºÑÑÐ°Ð»ÑÐ½ÑÑ Ð¸ ÑÐ½ÐµÑÐ³ÐµÑÐ¸ÑÐµÑÐºÑÑ ÑÑÑÐµÐºÑÐ¸Ð²Ð½Ð¾ÑÑÑ. ÐÑÐ»Ð¸ ÑÐ°ÑÑÐ¼Ð¾ÑÑÐµÐ½Ñ ÑÐ»ÐµÐ´ÑÑÑÐ¸Ðµ Ð¼ÐµÑÐ¾Ð´Ñ Ð±Ð¾ÑÑÐ±Ñ Ñ Ð·Ð°Ð¼Ð¸ÑÐ°Ð½Ð¸ÑÐ¼Ð¸: Ð¸ÑÐ¿Ð¾Ð»ÑÐ·Ð¾Ð²Ð°Ð½Ð¸Ðµ Ð·Ð°ÑÐ¸ÑÐ½ÑÑ Ð¸Ð½ÑÐµÑÐ²Ð°Ð»Ð¾Ð² (ÑÑÐ°Ð²Ð½ÐµÐ½Ð¸Ðµ Ð¸ÑÐ¿Ð¾Ð»ÑÐ·Ð¾Ð²Ð°Ð½Ð¸Ñ ÑÐ¸ÐºÐ»Ð¸ÑÐµÑÐºÐ¾Ð³Ð¾ Ð¿ÑÐµÑÐ¸ÐºÑÐ° Ð¸ Ð¿Ð°ÑÐ·Ñ) Ð¸ Ð¿Ð¸Ð»Ð¾Ñ ÑÐ¸Ð¼Ð²Ð¾Ð»Ð¾Ð² (Ð²Ð»Ð¸ÑÐ½Ð¸Ðµ Ð½Ð° Ð¿Ð¾Ð¼ÐµÑÐ¾ÑÑÑÐ¾Ð¹ÑÐ¸Ð²Ð¾ÑÑÑ Ð¿ÑÐ¸ÐµÐ¼Ð° Ð¸ ÑÐ¿ÐµÐºÑÑÐ°Ð»ÑÐ½ÑÑ ÑÑÑÐµÐºÑÐ¸Ð²Ð½Ð¾ÑÑÑ), Ð¿ÑÐ¸Ð¼ÐµÐ½ÐµÐ½Ð¸Ðµ ÑÐºÐ²Ð°Ð»Ð°Ð¹Ð·ÐµÑÐ¾Ð² (ÑÐºÐ²Ð°Ð»Ð°Ð¹Ð·ÐµÑ ÐÐ¸ÑÐµÑÐ±Ð¸, DFE, ZFE). 2. ÐÐ½Ð°Ð»Ð¸Ð· Ð¾ÑÐ¾Ð±ÐµÐ½Ð½Ð¾ÑÑÐµÐ¹ Ð¿ÑÐ¸Ð¼ÐµÐ½ÐµÐ½Ð¸Ñ Ð¼ÐµÑÐ¾Ð´Ð¾Ð² Ð±Ð¾ÑÑÐ±Ñ Ñ Ð·Ð°Ð¼Ð¸ÑÐ°Ð½Ð¸ÑÐ¼Ð¸ Ð´Ð»Ñ Ð¼Ð½Ð¾Ð³Ð¾ÑÐ°ÑÑÐ¾ÑÐ½ÑÑ Ð½ÐµÐ¾ÑÑÐ¾Ð³Ð¾Ð½Ð°Ð»ÑÐ½ÑÑ ÑÐ¸Ð³Ð½Ð°Ð»Ð¾Ð². ÐÑÐ»Ð¸ ÑÐ°ÑÑÐ¼Ð¾ÑÑÐµÐ½Ñ ÑÐ¿ÐµÐºÑÑÐ°Ð»ÑÐ½Ð¾ ÑÑÑÐµÐºÑÐ¸Ð²Ð½ÑÐµ ÑÐ¸Ð³Ð½Ð°Ð»Ñ (SEFDM) Ð¸ Ð¿ÑÐ¾Ð°Ð½Ð°Ð»Ð¸Ð·Ð¸ÑÐ¾Ð²Ð°Ð½Ñ ÑÐ°Ð·Ð»Ð¸ÑÐ½ÑÐµ Ð¼ÐµÑÐ¾Ð´Ñ Ð´ÐµÐ¼Ð¾Ð´ÑÐ»ÑÑÐ¸Ð¸ (Ð¿Ð¾ÑÐ»ÐµÐ¼ÐµÐ½ÑÐ½ÑÐ¹ Ð¿ÑÐ¸ÐµÐ¼, Ð°Ð»Ð³Ð¾ÑÐ¸ÑÐ¼ ÐÐ¸ÑÐµÑÐ±Ð¸, ÑÑÐµÑÐ¸ÑÐµÑÐºÐ¸Ð¹ Ð´ÐµÐºÐ¾Ð´ÐµÑ, BCJR Ð°Ð»Ð³Ð¾ÑÐ¸ÑÐ¼). 3. Ð¤Ð¾ÑÐ¼Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ðµ ÑÐµÐºÐ¾Ð¼ÐµÐ½Ð´Ð°ÑÐ¸Ð¹ Ð¿Ð¾ Ð¸ÑÐ¿Ð¾Ð»ÑÐ·Ð¾Ð²Ð°Ð½Ð¸Ñ Ð¼ÐµÑÐ¾Ð´Ð¾Ð² Ð±Ð¾ÑÑÐ±Ñ Ñ Ð·Ð°Ð¼Ð¸ÑÐ°Ð½Ð¸ÑÐ¼Ð¸ Ð² ÑÐ°Ð·Ð»Ð¸ÑÐ½ÑÑ ÑÐ¸ÑÑÐµÐ¼Ð°Ñ Ð¿ÐµÑÐµÐ´Ð°ÑÐ¸ Ð½Ð° Ð¾ÑÐ½Ð¾Ð²Ðµ Ð¼Ð½Ð¾Ð³Ð¾ÑÐ°ÑÑÐ¾ÑÐ½ÑÑ ÑÐ¸Ð³Ð½Ð°Ð»Ð¾Ð². ÐÑÐ»Ð¸ Ð¿ÑÐµÐ´Ð»Ð¾Ð¶ÐµÐ½Ñ ÑÐµÐºÐ¾Ð¼ÐµÐ½Ð´Ð°ÑÐ¸Ð¸ Ð¿Ð¾ Ð¿ÑÐ¸Ð¼ÐµÐ½ÐµÐ½Ð¸Ñ ÑÐ°ÑÑÐ¼Ð¾ÑÑÐµÐ½Ð½ÑÑ Ð¼ÐµÑÐ¾Ð´Ð¾Ð² Ð±Ð¾ÑÑÐ±Ñ Ñ Ð·Ð°Ð¼Ð¸ÑÐ°Ð½Ð¸ÑÐ¼Ð¸ Ð² ÑÐ»ÐµÐ´ÑÑÑÐ¸Ñ ÑÐ¸ÑÑÐµÐ¼Ð°Ñ ÑÐ²ÑÐ·Ð¸: LTE, Wi-Fi, ÑÐ°Ð´Ð¸Ð¾ÑÐµÐ»ÐµÐ¹Ð½Ð°Ñ ÑÐ²ÑÐ·Ñ.
description: Tasks that were solved during the work: 1. Analysis of methods to combat fading when using OFDM signals.Â  Assessment of implementation complexity.Â  Assessing the impact of the proposed methods on spectral and energy efficiency. The following methods of combating fading were considered: the use of guard intervals (comparing the use of a cycli prefix and zero padding) and pilot symbols (the impact on reception noise immunity and spectral efficiency), the use of equalizers (Viterbi equalizer, DFE, ZFE). 2. Analysis of the features of using anti-fading methods for multi-frequency non-orthogonal signals. Spectrally efficient signals (SEFDM) were considered and various demodulation methods were analyzed (element-by-element reception, Viterbi algorithm, spherical decoder, BCJR algorithm). 3. Formation of recommendations for the use of anti-fading methods in various transmission systems based on multi-frequency signals. Recommendations were proposed for the application of the considered methods of combating fading in the following communication systems: LTE, Wi-Fi, radio relay communications.