Communication device and communication method

摘要

The modulator creates modulated signals from input signals. The series/parallel converter creates subcarrier modulated signals from the remaining data and modulated signals. The arithmetic operator arranges and combines a first number of elements of the subcarrier modulated signals from the first one and a second number of elements of a data series from the first one each multiplied by a given amplitude coefficient to create arithmetic operation data. The IFFT executor executes the inverse fast Fourier transformation of the arithmetic operation data. The combiner creates baseband signals from the arithmetic operation results. The determiner calculates the peal-to-average power ratio of the baseband signals. The processing of the arithmetic operator to the determiner is repeated while changing at least one of given numbers until the baseband signals complying with a given criterion are detected. The transmitter creates transmission signals from the baseband signals and transmits the transmission signals via an antenna.

主权项

1. A communication device communicating with other devices through wireless communication of an orthogonal frequency-division multiplexing communication scheme, comprising:
a modulator modulating input signals with a given modulation scheme, and assigning the elements of given remaining data and the elements of the modulated input signals to subcarriers of which the frequency components are orthogonal to each other to create subcarrier modulated signals; an arithmetic operator arranging in sequence and combining a first number of elements from the first one among the elements of the subcarrier modulated signals and a second number of elements from the first one among the elements of a given data series each multiplied by a given amplitude coefficient to create arithmetic operation data, the given data series comprising a set of data and having such an autocorrelation property that the autocorrelation value to the same data series in which the data are not shifted is higher than the autocorrelation value to a data series in which the data are shifted; an IFFT executor executing the inverse fast Fourier transformation of the arithmetic operation data; a combiner combining the arithmetic operation results from the IFFT executor to create baseband signals; a determiner calculating the peak-to-average power ratio of the baseband signals and determining whether the peak-to-average power ratio complies with a given criterion; a controller repeatedly executing the processing of the arithmetic operator, IFFT executor, combiner, and determiner while changing at least one of the first and second numbers until the baseband signals of which the peak-to-average power ratio complies with the given criterion are detected; an updater updating the remaining data with data comprising the elements that are not contained in the arithmetic operation data corresponding to the baseband signals complying with the given criterion among the elements of the subcarrier modulated signals; and a transmitter creating transmission signals from the baseband signals complying with the given criterion and transmitting the transmission signals.