A transmitting apparatus, receiving apparatus, communication system, and a signal
processing method of each applying a suitable modulation method and transmission
path estimation method in accordance with characteristics of the transmission information
for improving the transmission efficiency operate so that at the transmission side,
the ratio of adding transmission path estimation pilot symbols is suitably controlled
in accordance with an aspect of the dat transmitted, for example, the size of the
packets transmitted and the state of the transmission path, wherein the transmission
data is mapped by the selected modulation method, and the signal is processed in
accordance with the method of estimation of the transmission path, and the transmission
signal is produced by inverse fast Fourier transform processing and transmitted.
At the reception side, the received signal is fast Fourier transformed, the transmission
path is estimated by the transmission path estimation method selected at the transmission
side, the received signal is correct in accordance with result, and the received
data is reproduced in accordance with the modulation method. Therefore, it is possible
to always adopt the optimum transmission method in accordance with the attribute
of the transmission data etc. and possible to realize an improvement of a transmission
efficiency and an enhancement of the quality of communication.
