Patent ID: 9083431
Filing Date: 2015-07-14
Classification: H04B,H04L

Abstract:
1. A communication apparatus for communicating with another apparatus in orthogonal frequency-division multiplexing wireless communication, the communication apparatus comprising: a modulator for modulating an input signal using a predetermined modulation scheme, and assigns the modulated input signal to subcarriers with frequency components orthogonal to each other, thereby generating a subcarrier modulation signal; a controller configured to start processes of: performing an inverse fast Fourier transformation on the subcarrier modulation signal to generate first data; decomposing the first data into real data which is a real part of the first data, and imaginary data which is an imaginary part of the first data; using a predetermined positive threshold value greater than a maximum value of elements in an input data series which is the real data or the imaginary data, and a predetermined negative threshold value equal to or less than a minimum value of the elements in the input data series, or using a predetermined positive threshold value equal to or greater than the maximum value of the elements in the input data series, and a predetermined negative threshold value less than the minimum value of the elements in the input data series, generating positive data having a positive element whose value is less as a value of the element in the input data series is greater by subtracting from the positive threshold value a value of each element whose value is greater than a predetermined boundary value and by setting to 0 a value of each element whose value is equal to or less than the predetermined boundary value in the elements of the input data series, and negative data having a negative element whose value is less as a value of the element in the input data series is greater by subtracting from the negative threshold value a value of each element whose value is equal to or less than the predetermined boundary value and by setting to 0 a value of each element whose value is greater than the predetermined boundary value in the elements of the input data series, or generating positive data having a positive element whose value is less as a value of the element in the input data series is greater by subtracting from the positive threshold value a value of each element whose value is equal to or greater than the predetermined boundary value and by setting to 0 a value of each element whose value is less than the predetermined boundary value in the elements of the input data series, and negative data having a negative element shows value is less as a value of the element in the input data series is greater by subtracting from the negative threshold value a value of each element whose value is less than the predetermined boundary value and by setting to 0 a value of each element whose value is equal to or greater than the predetermined boundary value in the elements of the input data series; processing each of the real data and the imaginary data being the input data series, adding the positive data and the negative data which are generated based on the real data to generate real operation data, and adding the positive data and the negative data which are generated based on the imaginary data to generate imaginary operation data; synthesizing the real operation data and the imaginary operation data to generate a baseband signal; and a transmitter for generating a transmission signal from the baseband signal.