Ion POPA
Rezumat
In aceasta lucrarea este realizat un studiu de performanta pentru un sistem de comunicatie mobila care foloseste
tehnologia OFDM cu simbol pilot. Pentru realizarea acestui studiu am configurat un sistem de transmisii OFDM format din emitator ,receptor si canalul radio de comunicatie iar pe baza acestui sistem am realizat un program cu ajutorul caruia am urmarit evolutia erorii de bit si a erorilor de pachete pentru situatia cand transmisia OFDM se realizeaza in mediul cu zgomot alb Gaussian (AWGN) si mediul cu fading (mediul Rayleigh). Studiul erorilor de biti si erorilor de pachete s-a realizat in ambele cazuri in functie de raportul semnal zgomot (Eb/N0). Rezultatele acestui studiu arata ca atunci cand transmisia de dare se realizeaza in mediu cu zgomot Gaussian(AWGN) eroare de bit si eroarea de pachete sunt relativ mici fara a exista pericolul ca datele sa nu fie recuperate. Cand transmisia se realizeaza in mediu Raileigh cu fading pe doua cai exista pericolul ca datele sa nu poata fi recuperate . Daca transmisia OFDM se realizeaza cu simbol pilot datele sunt recuperate cu o eroare de bit si de pachete comparabila cu cea din AWGN.
Cuvinte cheie: eroare de biteroare de pachetespatiu de gardasimbol pilot.
Abstract
In this paper, performance is a study for a mobile communication system that uses OFDM technology with pilot symbol.
For this study, we set up an OFDM transmission system consists of transmitter, receiver and radio communication channel and
based on this we developed a system with which we follow the evolution of bit error and packet error for the situation when the
OFDM transmission on average at white Gaussian noise (AWGN) and the environment with fading (Rayleigh environment). Study of
bit errors and packet errors made in both cases based on signal to noise ratio (Eb/N0). The results of this study show that when
transmission is done in putting average Gaussian noise (AWGN), bit error and packet error are relatively small without fear that the
data is not recovered. When transmission is done in the fading environment in two ways Raileigh danger that the data can not be
recovered. If transmission OFDM symbol is done with the data is recovered with a pilot bit and packet error comparable to that of
AWGN.
Keywords: bit errorpacket errorthe guard intervalpilot symbol
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