Patent ID: 8180052
Filing Date: 2012-05-15
Classification: H04L

Abstract:
1. A data transmitting method executed by a data transmitting apparatus including a processor, the data transmitting method comprising: a multi-level code sequence generating step of generating, from predetermined key information, a multi-level code sequence that varies in a signal level in a random number manner, the multi-level code sequence generating step being performed via a multi-level code generating part of the data transmitting apparatus utilizing the processor of the data transmitting apparatus; a modulated signal generating step of selecting a modulation condition from among a plurality of predetermined modulation conditions corresponding to a plurality of combinations of signal levels of information data and signal levels of the generated multi-level code sequence, and generating a modulated signal of a predetermined modulation format, the modulated signal generating step being performed via a modulating part of the data transmitting apparatus utilizing the processor of the data transmitting apparatus; and a transmitting step of transmitting the generated modulated signal, the transmitting step being performed via the modulating part utilizing the processor of the data transmitting apparatus, wherein a maximum interval between signal points of multiple levels constructed in correspondence with a combination of the signal levels of the information data and the signal levels of the generated multi-level code sequence is equal to or more than twice an amplitude of the information data in the selected modulation condition of the generated modulated signal.