Channel characteristics estimation system, channel characteristics estimation method, communication apparatus, and communication method

A channel characteristics estimation method of estimating channel characteristics in a wireless communication system which performs frequency hopping, said method comprising:

• assigning, at a transmitter, phase values of carriers of frequencies used for frequency hopping to a first uniformly different value and to transmit a transmission signal for each hopping obtained by converting frequencies;
• and
• assigning, at a receiver, phase values of the carriers of the respective frequencies used for frequency hopping to a second uniformly different value, which is different than said first uniformly different value, so as to maintain a given relation with phase values for said transmitter and to perform frequency conversion based on a difference between said first uniformly different value and said second uniformly different value for reception signals of respective frequencies using respective frequencies to obtain a reception signal for each hopping.

A communication apparatus to estimate channel characteristics in a wireless communication system which performs frequency hopping, said apparatus comprising:

• reception means for assigning phase values of carriers of frequencies used for frequency hopping to a first uniformly different value and transmitting a transmission signal for each hopping obtained by converting frequencies;
• and
• channel characteristics estimation means for assigning phase values of the carriers of the respective frequencies used for frequency hopping to a second uniformly different value, which is different than said first uniformly different value, so as to maintain a given relation with phase values for a transmitter and performing frequency conversion based on a difference between a third uniformly different value assigned by the transmitter and said second uniformly different value for reception signals of respective frequencies using respective frequencies to obtain a reception signal for each hopping.

A communication method of estimating channel characteristics in a wireless communication system which performs frequency hopping, said method comprising:

• receiving, from a transmitter, carriers of frequencies used for frequency hopping having phase values assigned to a first uniformly different value for each hopping obtained by converting frequencies;
• and
• assigning phase values of the carriers of the respective frequencies used for frequency hopping to a second uniformly different value, which is different than said first uniformly different value, so as to maintain a given relation with phase values assigned by the transmitter and performing frequency conversion based on a difference between said first uniformly different value and said second uniformly different value for reception signals of respective frequencies using respective frequencies to obtain a reception signal for each hopping.