Patent ID: 7151948

Claim:
A communication control system for controlling radio communications between a transmitter and a receiver, comprising: a correlation unit configured to receive a pilot signal which is a sequence known at the receiver and transmitted by the transmitter, and generate a delay profile for specifying paths by taking correlations by using replica signals for a received pilot signal; a threshold determination unit configured to determine a threshold according to an index value regarding a communication state; and a path selection unit configured to compare a power level of each path in the delay profile with the threshold, select paths for which a comparison result satisfies a prescribed condition as valid paths, and output a selected delay profile formed by the valid paths as a channel estimation value; wherein the index value indicates one of a number of users communicating simultaneously, a number of traffics, a MCS (Modulation and Coding Scheme) level, a modulation scheme by which communications are currently carried out, and a fading frequency, the threshold being determined according to said one of the number of users communicating simultaneously, the number of traffics, the MCS level, the modulation scheme by which communications are currently carried out, and the fading frequency.