Receiver, a transmitter, a radio communication system and a channel estimation method

摘要

A radio communication system including a transmitter and a receiver ( 100 ) for transmitting MIMO channel signals is provided. The transmitter comprises a pilot signal insertion controller ( 93 ) for inserting a pilot signal for channel estimation into at least a leading frame; and an information symbol controller for controlling the number of information symbols to be contained in a frame, based on the existence of the pilot signal. The receiver comprises a received signal replica generator ( 112 ) for generating received signal replicas based on previously obtained provisional channel estimation values and transmission signal estimation values; a canceller ( 111 ) for removing, from a received signal, received signal replicas of at least a part of streams that are not channel estimation target streams; and a channel estimation value generator ( 113 ) for generating channel estimation values by a filter using outputs from the removing unit and the transmission signal estimation values.