| 摘要 |
PROBLEM TO BE SOLVED: To provide transmission schemes that can flexibly achieve a spatial multiplexing order, a spatial diversity order, and a channel estimation overhead order.SOLUTION: For data transmission, a spatial multiplexing order and subcarriers assigned to a receiver are determined. For each assigned subcarrier, M virtual antennas are selected from among V virtual antennas formed with V columns of an orthonormal matrix. V is selected to achieve the desired spatial diversity order and channel estimation overhead order. Output symbols are mapped to the M virtual antennas selected for each assigned subcarrier by applying the orthonormal matrix. Pilot symbols are also mapped to the V virtual antennas. The mapped symbols are provided for transmission from T transmit antennas. Different cyclic delays are applied to the T transmit antennas to improve diversity. |
