Patent ID: 7609610

Claim:
A wireless data transmission device of a communication system that carries out data communication on a burst basis by digital modulation, the transmission device comprising: a data stream dividing means for dividing transmission data at a given ratio; a first quadrature vector mapping means for providing a first divided data with a signal space diagram according to a first modulation method; a second quadrature vector mapping means for providing a second divided data with a signal space diagram according to a second modulation method having a higher modulation level than the first modulation method based on a communication control information, the information being for determining a modulation level on respective data symbols and known to a receiver; and a multiplexing means for placing a symbol modulated by the first modulation method and a symbol modulated by the second modulation method at given places respectively, then multiplexing a transmission burst, the symbol modulated by the second modulation method being multiplexed in a position contiguous to the symbol modulated by the first modulation method; wherein the given ratio is defined by a number of data symbols modulated by the first modulation method being more than a number of data symbols modulated by the second modulation method; a transmission packet generating means for generating and outputting transmission data on a packet basis based on a process in a higher layer, and also generating a transmission packet which outputs information about a size of the packet; and a transmission control means for detecting a quantity and an insertion place of the data symbol having the higher modulation level based on the information about a size of the transmission packet and information about a size of a burst in a physical layer, and for controlling a data separation by the data stream dividing means and a content of the burst generated by the multiplexing means based on information about a determined quantity and a determined insertion place about the symbol.