Multi-carrier CDMA radio transmitting method and apparatus, and channel estimation method and apparatus for multi-carrier CDMA radio transmitting system

A channel estimation method used for a multi-carrier CDMA radio transmitting system rendering radio transmission using n sub-carriers, for rendering channel estimation for each sub-carrier, comprising the steps of:

• a) separating a received signal having a frame configuration comprising the n sub-carrier components including m sub-carrier components into which pilot symbols are inserted, into the respective sub-carrier components, where m≦n;
• b) using the pilot symbols included in the sub-carrier components obtained through the separation, and rendering channel estimation so as to obtain individual channel estimation results for the sub-carriers;
• and
• c) rendering the channel estimation for each target sub-carrier based on the thus-obtained individual channel estimation results for the respective p sub-carriers and relationship between a channel state for the target sub-carrier and a channel state for each of the p sub-carriers, where p≦m.

A channel estimation apparatus used for a multi-carrier CDMA radio transmitting system rendering radio transmission using n sub-carriers, for rendering channel estimation for each sub-carrier, comprising:

• a sub-carrier separating part separating a received signal having a frame configuration comprising the n sub-carrier components including m sub-carrier components into which pilot symbols are inserted, into the respective sub-carrier components, where m≦n;
• an individual channel estimation part using the pilot symbols included in the sub-carrier components obtained by the sub-carrier separating part, and rendering channel estimation so as to obtain individual channel estimation results for the sub-carriers;
• and
• a channel estimation part rendering the channel estimation for the target sub-carrier based on the thus-obtained individual channel estimation results for the respective p sub-carriers and relationship between a channel state for the target sub-carrier and a channel state for each of the p sub-carriers, where p≦m.