| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a transmission route information feedback system, capable of estimating transmission route information of a channel impulse response, or the like, with high accuracy from a feedback signal, and also capable of transmitting information of an SNR (Signal to Noise Ratio). <P>SOLUTION: The channel impulse response which is the transmission route information of a down-link, is estimated using a known pilot signal for the down-link output from a down-link pilot signal memory 52 and a received signal in the frequency domain; and the estimation result is transformed to a channel frequency response in a DFT (Discrete Fourier Transform) circuit. An SNR estimation circuit 61 estimates the SNR of the down-link as the transmission route information using the received signal of the frequency domain and the estimated channel frequency response; and outputs it. A feedback signal creation circuit 62 receives the estimated channel frequency response, the SNR, and a known pilot signal for an up-link which is output from an up-link pilot signal memory 54; multiplexes the SNR, the channel frequency response, and the pilot signal for the up-link; and carries out feedback of them. <P>COPYRIGHT: (C)2011,JPO&INPIT |
