| 摘要 |
The present invention provides a user equipment and channel state information feedback method. The channel state information feedback method used in a coordinated multi-point system includes acquiring small-scale channel state information H′=[H′1, H′2, . . . , H′K] between a user equipment and all base stations joining coordination, acquiring large-scale channel state information li(i=1, . . . , K) between the user equipment and each of the base stations joining coordination, acquiring a CQI (CQIi=li▪|H′|, i=1, . . . , K) between the user equipment and each of the base stations joining coordination based on the small-scale channel state information and the large-scale channel state information, updating the source codebook C using the acquired CQI to acquire an updated codebook;{tilde over (C)},;performing quantization processing using the updated codebook to acquire CDI, and transmitting the CDI and the CQI associated with each of the base stations joining coordination to a base station as feedback to provide for channel reconstruction in the base station. According to the invention, the rate of utilization of feedback information is improved. |
| 主权项 |
1. A channel state information feedback method used in a coordinated multi-point system in which the number of base stations joining coordination is represented by K and a source codebook is expressed by C={Ci} wherein i=1, . . . , 2N, Ci=[Ci,1, . . . , Ci,K], and N is the number of bits transmitted as feedback, the method comprising:
a user equipment acquiring small-scale channel state information H′=[H′1, H′2, . . . , H′K] between the user equipment and all base stations joining coordination; the user equipment acquiring large-scale channel state information 1i, wherein i=1, . . . , K between the user equipment and each of the base stations joining coordination; the user equipment acquiring a Channel Quality Information (CQI), wherein CQIi=1i·|H′|, wherein i=1, . . . , K, and wherein · represents a dot product, between the user equipment and each of the base stations joining coordination, based on the small-scale channel state information and the large-scale channel state information; the user equipment updating the source codebook C using the acquired CQI to acquire an updated codebook {tilde over (C)}; the user equipment performing quantization processing using the updated codebook to acquire Channel Direction Information (CDI); and the user equipment transmitting the CDI and the CQI associated with each of the base stations joining coordination to a base station as feedback to provide for channel reconstruction in the base station. |
