| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide techniques for efficiently deriving uplink channel estimates without consuming too much special uplink resources. <P>SOLUTION: UE 120 sends a request for uplink resources on a request channel (REQCH) whenever the UE transmits data on the uplink. The UE sends, from multiple antennas, REQCH data on data subcarriers and a pilot on pilot subcarriers. A Node B 110 receives the request, estimates the complex channel gains for the pilot subcarriers on the basis of received pilot symbols, and coherently demodulates received data symbols on the basis of the channel gain estimates. The Node B estimates the complex channel gains for the data subcarriers on the basis of demodulated data symbols, and derives a channel estimate for each antenna on the basis of the channel gain estimates for the pilot and data subcarriers. <P>COPYRIGHT: (C)2013,JPO&INPIT |
