| 摘要 |
Multiple antennas employed at transmitting and receiving nodes can significantly increase a MIMO system capacity, especially when the geometry of the receiving node is high. The transmitting node can determine geometry by transmitting common pilots (which may include legacy and non-legacy common pilots) and receiving feedback from the receiving node based on the common pilots. The geometry can also be determined through measuring uplink signals from the receiving node. If the geometry is high enough, the transmitting node may transmit demodulation pilot(s) in addition to the common pilots. The demodulation pilot transmission may be concurrent with data transmission. The receiving node can use the demodulation pilot(s) to estimate the channel for demodulating the data received from the transmitting node. The transmitting node may notify the receiving node to monitor for the demodulation pilot(s) through a configuration message sent over a control channel. |
