Demodulation of aggregated RF signal in three frequencies bands with a unique Rx chain

Among the concerns of 4th generation wireless communication networks, there is the lack of desired bandwidth in a continuous manner in the frequency spectrum. The recommended solution is to transport the information on a Radio Frequency (RF) signal constituted of discontinuous frequency bands. Nowadays, the receiver architecture is generally constituted of n chains of receiver (Rx), n being the number of aggregated frequency bands. This paper demonstrates theoretically and practically that the demodulation of a RF signal having three discontinuous frequency bands can be made by a single Rx chain. The principle consists in down converting aggregated RF signal by mixing with a local oscillator (LO) signal constituted by n Continuous Wave (CW) signals. Using this technique the transposed signals occupy a narrow frequency band.