Abstract: Provided is a method of generating electromagnetic waves using software. The method includes setting electromagnetic wave pattern data in consideration of a number of a bus (140, 150) connecting a central processing unit (CPU, 110) with a main memory (130) and transmission characteristics of the bus, storing the electromagnetic wave pattern data in a register of the CPU (110), setting an address in the main memory (130) at which the electromagnetic wave pattern data will be recorded, and transferring the electromagnetic wave pattern data to the set address in the main memory (130) through all the lines of the bus (140, 150). Here, electromagnetic waves corresponding to the electromagnetic wave pattern data are generated while the electromagnetic wave pattern data is transferred to the main memory through the bus.

Abstract: Provided is a method of generating electromagnetic waves using software. The method includes setting electromagnetic wave pattern data in consideration of a number of a bus (140, 150) connecting a central processing unit (CPU, 110) with a main memory (130) and transmission characteristics of the bus, storing the electromagnetic wave pattern data in a register of the CPU (110), setting an address in the main memory (130) at which the electromagnetic wave pattern data will be recorded, and transferring the electromagnetic wave pattern data to the set address in the main memory (130) through all the lines of the bus (140, 150). Here, electromagnetic waves corresponding to the electromagnetic wave pattern data are generated while the electromagnetic wave pattern data is transferred to the main memory through the bus.

Abstract: The present invention relates to a security codeless telephone unit using bluetooth and communication method using the same. According to the present invention, a communication of a body of a codeless telephone in a portable device of a security codeless telephone with a portable device in a counterpart codeless telephone via a network is safely secured from a wiretapping. In order to accomplish this, the security codeless telephone unit according to the present invention includes the codeless telephone body and a portable device both of which are connected via bluetooth for allowing voice or data communication mode. Thus, if there is a request for switching a security mode from the portable device or the body, the portable device converts voice signals into encrypted digital signals using a voice codec, a vocoder and an encryption module.

Abstract: An initial frame synchronization method for finding out the initial frame synchronization offset at a receiver using the orthogonal frequency division multiplexing signals by which any data is given and received in a frame unit, and by the estimation method of the phase difference variation and the maximum likelihood in the frequency domain.