Panasonic Corporation

Eiji Ota

Mitsuru Uesugi

Atsushi Sumasu

Yuta Seki

Keisuke Ebiko

A transmitting apparatus, a receiving apparatus and a wireless communication method for suppressing interference between codes, while further reducing the ratio of redundant components occupying a signal to improve the transmission efficiency. The transmitting apparatus () transmits a signal having a frame structure in which a plurality of symbols follow a pilot symbol to which a guard interval has been added. In the receiving apparatus () that receives that signal, a long FFT target section acquiring part () acquires, from the received OFDM signal, a long FFT target section that is a target section in which delay waves are to be removed by use of a pilot symbol. A long FFT part () performs a fast Fourier transformation of the long FFT target section to convert it to a frequency domain signal. A frequency equalizing part () performs a frequency equalization of the long FFT target section by use of an interpolation result of communication line estimation value. A long IFFT part () performs an inverse fast Fourier transformation of the long FFT target section as frequency equalized to convert it back to a time domain signal.

Transmitting apparatus, receiving apparatus, and wireless communication method

To narrow the dynamic range of multicarrier signals and prevent both the increment of cost and the degradation of power efficiency. A modulating part () modulates transport data. An S/P converting part () performs an S/P conversion of a modulated symbol and outputs the modulated symbols, the number of which is the same as the number of all subcarriers, to an IFFT part () in parallel. The IFFT part () assigns the modulated symbols to the subcarriers, the frequencies of which are orthogonal to each other, to perform an inverse fast Fourier transform. A P/S converting part () performs a P/S conversion of the signals of time domain. When the instantaneous amplitude level of an OFDM signal is lower than a predetermined threshold value, a pit clip part () replaces this amplitude level by the predetermined threshold value. In other words, when the instantaneous power of the OFDM signal is close to zero, the pit clip part () converts a power value to a value that is greater than the actual power value.

Multicarrier transmitting apparatus and multicarrier transmitting method

A radio receiving apparatus wherein the interference can be minimized and the power and bands can be effectively used in the process of receiving a signal comprising a combination of an impulse signal and an OFDM signal. In this apparatus, a transmission path equalizing part () performs a transmission path equalizing process of a signal comprising a combination of an OFDM signal and an impulse signal of UWB-IR system, and a signal separating part () uses a constant (C) to clip the amplitude level for a signal (Y) demodulated as the OFDM signal, and substantially clips only the signal components of the impulse signal. Further, only when a signal (Y) demodulated as the impulse signal exhibits an amplitude level greater than the constant (C), it is outputted, while most of the signal power of the combined OFDM signal is removed.

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Tokyo, Japan

Eiji Ota