Abstract
This paper deals with the effect of the Single-Input Multiple-Output spatial diversity on the OFDM mobile radio signal propagating in an urban channel by means of the improvement of the capacity calculated from measurements performed in Rio de Janeiro city, Brazil, using two receiving antennas and comparing the individual capacity of each branch with that reached with the diversity.
Highlights
Over the last years, the OFDM (Orthogonal Frequency Division Multiplexing) technique has received special attention to the mobile radio communication in the cellular systems [1,2,3]
Among them is the spatial diversity which is most referred in several studies and it has been used in the reception of the OFDM signal
This paper provides experimental results for the capacity obtained in a 2.48 GHz band using the spatial diversity in a SIMO (Single-Input Multiple-Output) system
Summary
The OFDM (Orthogonal Frequency Division Multiplexing) technique has received special attention to the mobile radio communication in the cellular systems [1,2,3]. The modulated signal was conducted to the vector signal generator, which sent the signal on the 2.48 GHz carrier to the power amplifier, followed by the antenna and for radiating and sounding the channel Such sequence helped to identify the OFDM symbols in the off-line processing because of its correlation property [11]. The variation of RMS (Root Mean Square) delay spread [12] calculation is demonstrated in Table III for each diversity link named L1 (related to antenna 1) and L2 (related to antenna 2) Such values show that the sounded channel was not WSSUS since the dispersion parameters had a large variation and just one PDP was not able to represent the channel. By using the dfittool function of Matlab , the amplitude samples of the noise presented a better adjustment to the Gaussian statistics, allowing us to use the most largely equations found in literature for calculating channel capacity as described
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