| 摘要 |
Based on interference electric power attributed to a delayed wave, interference electric power attributed to a signal from another non-targeted terminal or a base station, and noise electric power, in order to obtain an index for further exactly representing the signal quality, the combination of a desired-signal/undesired-signal ratio 1 (referred to as DUR 1 ) that is a power ratio of a signal component to an interference component either from another terminal of a serving cell or from a terminal or a base station, etc. of neighborhood cells and a noise component, and a desired-signal/undesired-signal ratio 2 (referred to as DUR 2 ) that is a power ratio of a signal component to an inter-symbol interference component and an inter-carrier interference component attributed to the delayed wave is included in the index of the signal quality. A channel-impulse-response estimation unit 10 calculates a channel-impulse response from a received signal and a previously-held pilot symbol, and a desired-signal/undesired-signal ratio 2 estimation unit 15 estimates DUR 2 , using the channel-impulse response. A desired-signal/undesired-signal ratio 1 estimation unit 16 estimates DUR 1 using a pilot symbol included in a burst. A modulation-condition selection unit 11 determines a transmission parameter to be applied, using DUR 1 and DUR 2.
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