Pulse shaping method

A method for shaping a pulse used as a transmit pulse and a receive filter response, comprising:

• setting first time interval for shaping a pulse;
• and
• outputting a pulse with a first value, which is generated by multiplying a first parameter, generated based on a weight coefficient, by each of a plurality of cosine functions with different periods and summing the multiplication of the first parameter with each of the plurality of cosine functions with different periods, in the first time interval, and
• outputting a pulse with a second value in a second time interval other than the first time interval,
• wherein in the outputting of the pulse with the first value,
• when the first time interval includes L symbols with a symbol interval of T, a plurality of cosine functions respectively have a period of LT/k,
• where k represents a variable changeable from 0 to K according to a corresponding cosine function, K represents the number of cosine functions except a function with a frequency of 0, and when k is given as 0, the corresponding cosine function has a constant during the first time interval,
• wherein in the outputting of the pulse with the first value,
• the first parameter is generated by dividing the weight coefficient by the first function, and
• the first function is generated by multiplying each of the plurality of cosine functions by the corresponding weight coefficient, summing the multiplication of each of the plurality of cosine functions by the corresponding weight coefficient, squaring the sum, and integrating the squared value for the first time interval.