| abstract |
Digital signals are transmitted over a communication channel having a given bandwidth, by simultaneously transmitting: - one or more Spread Spectrum signals, such as Code Division Multiple Access signals (HSPA U1 , HSPA U2 , HSPA D1 , HSPA D2 ), wherein the spectrum of the Spread Spectrum signals (HSPA) exhibits roll-off transition bands (TR) at the boundaries of the spectrum, and - one or more multi-carrier transmission signal, such as Orthogonal Frequency Division Multiplexing signals (LTE u , LTE D ), which are transmitted over the transition bands (TR) of the Spread Spectrum signals (HSPA u1 , HSPA U2 , HSPA 01 , HSPA 02 ). |