Communication method, communication system, transmitter, and receiver

A communication method employing a base station and a terminal each having a transmitter and a receiver, for carrying out signal processing adapted for transmission-channel characteristics, comprising the steps of:

• in one of the base station and the terminal:
• in the receiver:
• computing a reception-signal-characteristics-correcting coefficient through the processes of detecting a correlation of a reception signal, and carrying out eigenvalue decomposition on a product matrix obtained by multiplying a correlation matrix having the detected correlation as elements and a transported matrix of the correlation matrix together;
• and
• correcting, according to the reception-signal-characteristics-correcting coefficient, at least one of a frequency characteristic and a spatial frequency characteristic of the reception signal;
• and
• in the other of the base station and the terminal:
• in the receiver:
• computing a transmission-signal-characteristics-correcting coefficient through the processes of detecting a correlation of a reception signal, and carrying out eigenvalue decomposition on a product matrix obtained by multiplying a correlation matrix having the detected correlation, as elements and a transported matrix of the correlation matrix together;
• and
• in the transmitter:
• correcting, according to the transmission-signal-characteristics-correcting coefficient, at least a transfer function and a spatial frequency characteristic of a transmission signal.

A communication method employing a base station and a terminal each having a transmitter and a receiver, for carrying out signal processing adapted for transmission-channel characteristics, comprising the steps of:

• in the receiver of each of the base station and terminal:
• computing a transmission-signal-characteristics-correcting coefficient and a reception-signal-characteristics-correcting coefficient through the processes of detecting a correlation of a reception signal, and carrying out eigenvalue decomposition on a product matrix obtained by multiplying a correlation matrix having the detected correlation as elements and a transported matrix of the correlation matrix together;
• and
• correcting, according to the reception-signal-characteristics-correcting coefficient, at least one of a frequency characteristic and a spatial frequency characteristic of the reception signal;
• and
• in the transmitter of each of the base station and terminal:
• correcting, according to the transmission-signal-characteristics-correcting coefficient, at least one of a transfer function and a spatial frequency characteristic of a transmission signal.

A communication system employing a transmitter and a receiver, for carrying out signal processing adapted for transmission-channel characteristics, comprising:

• the transmitter having:
• coefficient detection means for detecting a transmission-signal-characteristics-correcting coefficient sent from the receiver;
• and
• transmission signal correction means for correcting, according to the transmission-signal-characteristics-correcting coefficient, at least one of a transfer function and a spatial frequency characteristic of a transmission signal;
• and
• the receiver having:
• coefficient computation means for the transmission-signal-characteristics-correcting coefficient and a reception-signal-characteristics-correcting coefficient through the processes of detecting correlation of a reception signal, and carrying out eigenvalue decomposition on a product matrix obtained by multiplying a correlation matrix having the detected correlation as elements and a transported matrix of the correlation matrix together;
• reception signal correction means for correcting, according to the reception-signal-characteristics-correcting coefficient, at least one of a frequency characteristic and a spatial frequency characteristic of a reception signal;
• and
• coefficient transmission means for transmitting the transmission-signal-characteristics-correcting coefficient to the transmitter.

A communication system employing a base station and a terminal each having a transmitter and a receiver, for carrying out signal processing adapted for transmission-channel characteristics, comprising:

• in one of the base station and terminal:
• the receiver having:
• coefficient computation means for computing a reception-signal-characteristics-correcting coefficient through the processes of detecting a correlation of a reception signal, and carrying out eigenvalue decomposition on a product matrix obtained by multiplying a correlation matrix having the detected correlation as elements and a transported matrix of the correlation matrix together;
• and
• reception signal correction means for correcting, according to the reception-signal-characteristics-correcting coefficient, at leas one of a frequency characteristic and a spatial frequency characteristic of the reception signal;
• and
• in the other of the base station and terminal:
• the receiver having:
• coefficient computation means for computing a transmission-signal- characteristics-correcting coefficient through the processes of detecting a correlation of a reception signal, and carrying out eigenvalue decomposition on a product matrix obtained by multiplying a correlation matrix having the detected correlation as elements and a transported matrix of the correlation matrix together;
• and
• the transmitter having;
• transmission signal correction means for correcting, according to the transmission-signal-characteristics-correcting coefficient, at least one of a transfer function and a spatial frequency characteristic of a transmission signal.

A communication system employing a base station and a terminal each having a transmitter and a receiver, for carrying out signal processing adapted for transmission-channel characteristics, comprising:

• the receiver of each of the base station and terminal having;
• coefficient computation means for computing a transmission-signal-characteristics-correcting coefficient and a reception-signal-characteristics-correcting coefficient through the processes of detecting a correlation of a reception signal, and carrying out eigenvalue decomposition on a product matrix obtained by multiplying a correlation matrix having the detected correlation as elements and a transported matrix of the correlation matrix together;
• and
• reception signal correction means for correcting, according to the reception-signal-characteristics-correcting coefficient, at least one of a frequency characteristic and a spatial frequency characteristic of the reception signal;
• and
• the transmitter of each of the base station and terminal having:
• transmission signal correction means for correcting, according to the transmission-signal-characteristics-correcting coefficient, at least one of a transfer function and a spatial frequency characteristic of a transmission signal.

In a communication system employing a transmitter and a receiver, for carrying out signal processing adapted for transmission-channel characteristics, the receiver comprising:

• coefficient computation means for computing a transmission-signal-characteristics-correcting coefficient and a reception-signal-characteristics-correcting coefficient through the processes of detecting correlation of a reception signal, and carrying out eigenvalue decomposition on a product matrix obtained by multiplying a correlation matrix having the detected correlation as elements and a transported matrix of the correlation matrix together:
• reception signal correction means for correcting, according to the reception-signal-characteristics-correcting coefficient, at least one of a frequency characteristic and a spatial frequency characteristic of the reception signal;
• and
• coefficient transmission means for transmitting the coefficient to the transmitter.