kanału radiowego, czyli krótkich czasów koherencji kanału, powodowanych dużymi prędkościami terminala UMTS.
Bardzo dobrą adaptację odbiornika WCDMA z dodatkowym korektorem neuronowym ANN-MPL do szybkich zmian odpowiedzi impulsowej kanału radiowego potwierdziły wyniki badań przeprowadzone w ramach scenariuszy symulacyjnych odpowiadających środowisku radiokomunikacyjnemu użytkowników w pojazdach (podrozdział 5.3). Rezultaty badań uzyskane w ramach scenariuszy nr 17 (rys. 5-17) i 18 (rys. 5-18) pokazały, że zastosowanie dodatkowego korektora nieliniowego ANN w odbiorniku sygnałów WCDMA pozwoliło na zestawienie przez
stację bazową połączenia transmisji danych, obniżając bitową stopę błędów ÅP§ÍÎÎ
do poziomu poniżej 10WË. Podczas gdy dla klasycznego odbiornika WCDMA
z korektorem liniowym MMSE takie połączenie w ogóle nie było możliwe, bowiem
ÅP§MMNO≥ 10WË (rys. 5-17 i 5-18)
Podsumowując powyższe wnioski końcowe należy stwierdzić, ze wszystkie cele postawione w niniejszej rozprawie zostały osiągnięte, a jej teza – udowodniona. Wyniki zaprezentowane w rozprawie były wcześniej publikowane w pracach [Wsz08], [Wsz09] [Wsz10].
Przedłożona rozprawa doktorska może stanowić punkt wyjścia do dalszych prac związanych z zagadnieniami wykorzystania sztucznych sieci neuronowych w odbiornikach sygnałów radiowych, w tym w szczególności tych, które działają w środowisku szumów kolorowych i zniekształceń nieliniowych. Ponieważ w niniejszej rozprawie przeprowadzono analizę zastosowania sztucznych sieci neuronowych w odbiornikach WCDMA jedynie dla modulacji QPSK, dlatego dalsze prace można rozpocząć od oceny skuteczności korektorów neuronowych dla modulacji o wartościowości większej niż M=4, np. dla 16AQM czy 64QAM. Korektory neuronowe mogą również z powodzeniem znaleźć zastosowanie w systemach, gdzie istotnym problemem są zakłócenia nieliniowe, będące wynikiem występowania w torach sygnałowych nieliniowych wzmacniaczy mocy NLA
(Non-linear Power Amplifier). Przykładowo w systemach satelitarnych korzysta się niemal
wyłącznie z modulacji fazy, unikając modulacji amplitudy właśnie ze względu na zakłócenia nieliniowe generowane przez wzmacniacze mocy instalowane w transponderach satelitarnych. Nieliniowa charakterystyka wzmacniaczy mocy jest również bardzo poważnym problemem w systemach wielotonowych OFDM. Jest ona źródłem zakłóceń intermodulacyjnych IMD (InterModulation Distortion), stanowiących między innymi przyczynę interferencji międzykanałowej. Ma to szczególne znacznie w zyskujących coraz większą popularność technice RoF (Radio
over Fiber) wykorzystywanej w systemach komórkowych czwartej generacji LTE.
Tam źródłem zakłóceń nieliniowych są przetwornik elektryczno – optyczne (E/O) oraz optyczno – elektryczne (O/E) w torze nadawczo odbiorczym [Oli14]. Odbiorniki neuronowe mogą znaleźć również zastosowanie w systemach UWB (Ultra-Wide
Bandwidth) gdzie, podobnie jak w przypadku systemów WCDMA, głównym czynnikiem ograniczającym jakość działania systemu jest interferencja MAI [Nir13]. Badania nad zastosowaniem, zaproponowanych w niniejszej rozprawie korektorów neuronowych ANN, mogą wprowadzić nową jakość w wyżej wymienionych systemach.
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