Patent ID: 8483316

Claim:
An apparatus for modulating bit information, the apparatus including: a modulation symbol generator for performing modulation in which a signal wave form is positioned at a front part of an entire symbol duration or a latter part of the entire symbol duration based on a first bit of the bit information to generate a modulation symbol including a silent signal duration in which there is no signal waveform; wherein the modulation symbol generator includes: a symbol mapper for mapping the bit information to a symbol to generate a plurality of baseband symbols; a first multiplier for multiplying a first baseband symbol among the plurality of baseband symbols by a cosine function to generate a first pulse signal and outputs the first pulse signal; a second multiplier for multiplying a second baseband symbol among the plurality of baseband symbols by a sine function to generate a second pulse signal and outputs the second pulse signal; a third multiplier for multiplying the first pulse signal by a third baseband symbol among the plurality of baseband symbols such that the first pulse signal includes the silent signal duration; a fourth multiplier for multiplying the second pulse signal by the third baseband symbol among the plurality of baseband symbols such that the second pulse signal includes the silent signal duration; a delaying unit for delaying the second pulse signal output from the fourth multiplier and outputting the same; an adder for adding the delayed second pulse signal to the first pulse signal output from the third multiplier to generate the modulation symbol; and a transmitter for transmitting the generated modulation symbol.