SIGNAL VARIABILITY, COHERENCE BANDWIDTH AND DELAY SPREAD ON MOBILE RADIO PROPAGATION ENVIRONMENT AT 3.5GHZ / VARIABILIDADE DO SINAL, BANDA DE COERÊNCIA E ESPALHAMENTO TEMPORAL EM AMBIENTE DE RÁDIO PROPAGAÇÃO MÓVEL EM 3,5GHZ

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

This work presents a study of signal variability, coherence bandwidth and delay spread of a WiMAX signal transmitted through a mobile radio propagation environment. The statistical analysis of the received signal is compared with theoretical distributions. The transmitted WiMAX signal has its physical layer based on OFDM-256 and 3.4 GHz as central frequency. Based on the signal received during the measurements campaign some analysis are done: signal variability; level crossing rate; average fade duration; coherence bandwidth; and delay spread calculation, based on theoretical formulas, in LOS and NLOS environment. The received signal amplitude is plotted as a function of the cumulative probability and compared to the theoretical Rayleigh and m-Nakagami cumulative distributions. It¿s possible to notice a good characterization of the measured data based on those two distributions. Some graphs show the level crossing rate and average fade duration of a specific subcarrier of the received signal. In the same graphs are also plotted the theoretical values of Nakagami-m and Rayleigh distributions for those two parameters and we are able to see the good agreement. The correlation between subcarriers is also calculated in order to find out the correlation bandwidth for a correlation of 0.5. Once that the correlation bandwidth is known, the delay spread is calculated based on theoretical formulas.

ASSUNTO(S)

canal de propagacao radio-movel mobile-radio propagation channel

ACESSO AO ARTIGO

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