Mobile communication apparatus with multiple transmission and reception antennas and mobile communication method therefor

A base station with at least one reception antenna, the base station comprising:

• an information restoration unit for restoring long-term information, short-term eigenvectors, and a Signal to Interference and Noise Ratio effective (SINR) from a feedback signal transmitted from a mobile station;
• a basis information generating unit for generating basis vectors and gain values as basis information from the restored long-term information, the restored effective short-term eigenvectors, and the restored SINR;
• a gain adjustment unit for adjusting amplitudes of Dedicated Physical Channel (DPCH) signals according to the gain values, and outputting the adjusted results;
• a basis vector application unit for applying the basis vectors to the adjusted results input from the gain adjustment unit, and outputting the applied results as the spatially processed results;
• and
• an addition unit for adding Pilot Channel (PICH) signals to the spatially adjusted results to be transmitted to the mobile station;
• wherein the base station is not arranged to receive eigenvalues corresponding to the effective short-term eigenvectors from the mobile station as part of the feedback signal.

A mobile communication method performed in a base station with at least one transmission antenna, the method comprising the steps of:

• (a1) restoring long-term information, effective short-term eigenvectors, and a Signal to Interference and Noise Ratio (SINR) from a feedback signal transmitted from a mobile station;
• (a2) generating basis vectors and basis values as basis information from the restored long-term information, the restored effective short-term eigenvectors, and the restored SINR;
• (a3) adjusting amplitudes of Dedicated Physical Channel (DPCH) signals using gain values;
• (a4) applying the basis vectors to the amplitude-adjusted DPCH signals and determining the results as the spatially processed results;
• and
• (a5) adding Pilot Channel (PICH) signals to the spatially processed results and transmitting the added results via the at least one transmission antenna to the mobile station;
• wherein the mobile station is not arranged to transmit eigenvalues corresponding to the effective short-term eigenvectors to the base station as part of the feedback signal.

A mobile communication method performed in a mobile station with at least one reception antenna, the method comprising:

• between a base station with
• (b1) determining the first characteristic from pilot channel (PICH) signals transmitted from a base station, and a channel downlink characteristic for each of at least one transmission antenna of the base station and the at least one reception antenna using the first characteristic;
• (b2) determining long-term information having effective long-term eigenvectors and effective long-term eigenvalues using the determined channel downlink characteristic;
• (b3) determining short-term information having effective short-term eigenvectors using the determined channel downlink characteristic;
• (b4) obtaining downlink power control information including a Signal to Interference and Noise Ratio (SINR) which reflects the first characteristic, using the determined channel downlink characteristic;
• and
• (b5) combining the determined long-term information, short-term information, and downlink power control information into a feedback signal to be transmitted to the base station;
• wherein the base station is not arranged to receive eigenvalues corresponding to effective short-term eigenvectors from the mobile station as part of the feedback signal.