Patent ID: 8014439

Claim:
A communication apparatus comprising: a propagation path condition estimation section that estimates a speed of a change in a propagation path condition; a communication quality estimation section that changes a method of estimating a communication quality of a received signal, based on the estimated speed of the change in the propagation path condition, and estimates the communication quality; a transmission section that transmits the estimated communication quality to a communicating party; a reception section that receives data modulated in a modulation scheme determined by the communicating party based on the estimated communication quality; and a demodulation section that demodulates the received data, wherein: one of a fading pitch, a delay profile, and a fluctuation period of received signal power is used as a parameter indicating the estimated speed of the change in the propagation path condition; and the communication quality estimation section provides a longer first length of a first term for averaging the communication quality when a first estimated speed of the change in the propagation path condition is fast, and provides a second length of a second term for averaging the communication quality that is shorter than the first length when a second estimated speed of the change in the propagation path condition is slower than the first estimated speed of the change in the propagation condition, and averages information of the communication quality for the longer first length and the shorter second length to estimate the communication quality.