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Title: Совместное применение неоднородной иерархической модуляции и помехоустойчивого кодирования: бакалаврская работа
Creators: Иванова Екатерина Юрьевна
Organization: Санкт-Петербургский политехнический университет Петра Великого. Институт физики, нанотехнологий и телекоммуникаций
Imprint: Санкт-Петербург, 2015
Collection: Выпускные квалификационные работы; Общая коллекция
File type: PDF
Language: Russian
Rights: Доступ по паролю из сети Интернет (чтение, печать, копирование)

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The aim of this work is to improve the energy gain of signals by combined application of non-uniform hierarchical modulation and forward error correction codes. For two types of modulation (QPSK and QAM16) values of K that achieves the best BER performance at the predetermined signal-to-noise-ratio are found. Results of MatLab simulation shows that uncoded QPSK modulated signals with gain K = 4 BER curve are matched with the theoretical curve for QAM16. QPSK modulated and turbo-coded signals have the best BER performance when K = 2.5. An energy gain compared with the signals without application of hierarchical modulation (turbo-code and modulation QAM16) equal 1.5 dB. For turbo-coded and QAM16 modulated signals the best BER performance is achieved for K = 9. An energy gain compared with the signals without application of hierarchical modulation (turbo-code and modulation QAM256) equal 1 dB.

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