Radio transmission method, radio reception method, radio transmission apparatus and radio reception apparatus

Abstract

A pilot signal is transmitted with a predetermined frequency band (N e X N Rball X (1 + +-)) and a data signal is transmitted with a partial band (RB) of the frequency band, and the pilot signal and the data signal to be transmitted with at least the partial band (RB), are controlled its waveform to have the same waveforms in the frequency domain. Thus, in the case of controlling waveforms of the pilot signal and the data signal which have different occupied bands, it is possible to, in a portion of the occupied band for the data signal, avoid the mapping of a low-quality pilot signal or the like, enhance the data signal demodulation capability and improve the data signal reception characteristic while suppressing PAPR.

Description

technical field [0001] The present invention relates to a radio transmission method, a radio reception method, a radio transmission device, and a radio reception device. For example, the present invention relates to a technology suitable for a next-generation mobile communication system using DFT as a radio access method (Discrete Fourier Transform) - Extended OFDM (Orthogonal Frequency Division Multiplexing) method. Background technique [0002] Frequency Utilization is high and the PAPR (Peak-to-Average Power Ratio) of the transmitted signal is low. In order to meet these requirements, it has been discussed to utilize FDMA (Frequency Division Multiple Access) with respect to Single Carrier (SC) (for example, see Non-Patent Document 1 mentioned later). As one of the radio access schemes that can satisfy the above requirements, special attention has been paid to the DFT-extended OFDM mode (for example, see Non-Patent Documents 2 and 3 mentioned later). [0003] One featur...

AI Technical Summary

Problems solved by technology

[0067] As shown in Fig. 19, in the case where the roll-off ratios α of the waveform shaping filters 117-i and 119 adopted for the data signal and the pilot signal are the same but the bandwidths are different, for example, a low-quality pilot signal may be mapped on the data signal Near both ends of the occupied frequency band of , and since the channel distortion is different between the two signals, the reception performance deteriorates in the receiving station 200

[0068] That is, for example, at the right end (higher frequency side) of the occupied frequency band of the data signal, a low-quality (S / N) pilot signal whose amplitude is attenuated by the waveform shaping filter 119 is mapped for a part of the effective subcarrier, which reduces channel estimation accuracy and degrade reception performance

On the other hand, at the left end (lower frequency side) of the occupied frequency band of the data signal, for part of the subcarriers, channel distortion occurs between the data signal and the pilot signal due to devices including the waveform shaping filters 117-i and 119. different between, which will cause incorrect channel compensation for the data signal and degrade the reception performance of the data signal

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