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The UMTS network is complementary to GSM and GPRS. The GSM network covers the features required for voice-type services in a circuit mode, the network brings GFPRS the first features to the introduction of services such as packet data, and UMTS networks complement these by offering voice and data services on an additional packet. UMTS is thus an extension of GPRS and also works in packet mode. The transmission speed offered by UMTS networks to 2Mbit/s. UMTS infrastructure enables expansion of frequencies as well as changes in data coding. In this paper, the use of OFDM signals in the UMTS access network UTRANFDD and 64QAM modulation allowed us to improve the rate 2Mbit/s to 22.5 Mbit/s. The results, including improved throughput to 22.5Mbit/s, show us that the power frequency spectrum of a single OFDM signal is centered around the fundamental frequency, but the spectral width of the power spectrum of the OFDM signals is higher than that of the power spectrum is a function that is typically used in UMTS. We also noted that the greater the number of carriers increases, the more important the spectral width is. The multicarrier modulation was based, in our case, on the choice of the multiplexing of signals without noise and with noise.

The Multiplexing Of OFDM Signals On The Downlink In UTRAN-FDD