Patent ID: 7860075

Claim:
A transmission device, comprising: a first communication control module that generates a first transmission signal based on a first radio access scheme, the first transmission signal corresponding to a first plurality of users; a second communication control module that generates a second transmission signal based on a second radio access scheme different from the first radio access scheme, the second transmission signal corresponding to a second plurality of users; a transmission parameter determining module that determines whether or not frequency resources are currently being used for the first transmission signal, and whether or not a transmission parameter of the second transmission signal is known to the first transmission signal; a pulse-shaping control module, that on the basis of a determination result obtained by the transmission parameter determining module controls the first communication control module to generate a pulse-shaped first transmission signal; an adding module that, when the first transmission signal is pulse-shaped on the basis of the control performed by the pulse-shaping control module, generates a combined transmission signal by adding the pulse-shaped first transmission signal to the second transmission signal; and a transmitting module for transmitting the combined transmission signal generated by the adding module wherein the transmission parameter is determined as known or unknown, when the transmission parameter is determined to be unknown to the first transmission signal, the pulse-shaping control module is configured to control the first communication control module to pulse-shape the first transmission signal to increase the spectral redundancy owing to cyclostationarity, and when the transmission parameter is determined to be known to the first transmission signal, the pulse-shaping control module is configured to control the first communication control module to pulse-shape the first transmission signal to increase spectral redundancy owing to cyclostationarity and to minimize interference to a frequency band occupied by the second transmission signal.