Preamble generating device, preamble generating method, and non-transitory computer-readable recording medium storing a program

A preamble generating method that generates a preamble of a transmit signal, comprising:

• a model determining step that determines on a preamble model including a plurality of elements with a value of 0 or 1, according to a preamble requested for generation;
• a first calculating step that generates first computational data by reordering elements in at least one of either a real data sequence that is a real part of a data sequence having a number of elements determined according to a number of elements in the preamble model, or an imaginary data sequence that is an imaginary part of the data sequence;
• a second calculating step that generates second computational data in which elements of data obtained by applying a fast Fourier transform to the first computational data are spaced apart by a designated number of elements, the second computational data having a same number of elements as the number of elements in the preamble model;
• a preamble generating step that generates a preamble by multiplying each element of the second computational data by an element of the preamble model at a same position as the each element;
• and
• a preamble determining step that determines on the preamble as a preamble of the transmit signal in a case in which a peak-to-average power ratio of data obtained by applying an inverse fast Fourier transform to the preamble matches a predetermined criterion.

A non-transitory computer-readable recording medium storing a program causing a computer that controls a preamble generating device that generates a preamble of a transmit signal to execute:

• a model determining step that determines on a preamble model including a plurality of elements with a value of 0 or 1, according to a preamble requested for generation;
• a first calculating step that generates first computational data by reordering elements in at least one of either a real data sequence that is a real part of a data sequence having a number of elements determined according to a number of elements in the preamble model, or an imaginary data sequence that is an imaginary part of the data sequence;
• a second calculating step that generates second computational data in which elements of data obtained by applying a fast Fourier transform to the first computational data are spaced apart by a designated number of elements, the second computational data having a same number of elements as the number of elements in the preamble model;
• a preamble generating step that generates a preamble by multiplying each element of the second computational data by an element of the preamble model at a same position as the each element;
• and
• a preamble determining step that determines on the preamble as a preamble of the transmit signal in a case in which a peak-to-average power ratio of data obtained by applying an inverse fast Fourier transform to the preamble matches a predetermined criterion.