Pilot sending method and apparatus

A base station device, comprising:

• a spreading unit, configured to perform spreading on at least two signature sequences by using a spreading code, wherein each signature sequence of the at least two signature sequences is used as a dedicated pilot of at least one data stream of at least one user equipment (UE), and the dedicated pilot is used by the at least one UE to perform precoding matrix estimation;
• a precoding unit, configured to perform precoding on sequences output by the spreading unit, wherein one of the group consisting of a precoding matrix and a precoding vector which is used in performing the precoding, is the same as another one of the group consisting of a precoding matrix and a precoding vector, which is used to perform the precoding on data streams corresponding to the at least two signature sequences;
• and
• a sending unit, configured to send the sequences output by the precoding unit to the at least one UE;
• wherein the spreading unit comprises at least one of the following spreading modules:
• a first spreading module, configured to perform spreading on the at least two signature sequences by using the spreading code, wherein each signature sequence of the at least two signature sequences is used as a dedicated pilot of at least one data stream of each UE of at least two UEs;
• and
• a second spreading module, configured to perform the spreading on the at least two signature sequences by using the spreading code, wherein each signature sequence of the at least two signature sequences is used as dedicated pilots of at least two data streams of the at least one UE.

A user equipment (UE), comprising:

• a receiving unit, configured to receive dedicated pilots sent by a network side;
• a descrambling unit, configured to perform descrambling on the dedicated pilots received by the receiving unit;
• a despreading unit, configured to perform, according to a spreading code of the received dedicated pilots, despreading on the received dedicated pilots, and obtain new dedicated pilots that belong to different data streams, wherein the spreading code is used to implement at least one of the group consisting of:
• (a) performing spreading on at least two signature sequences, wherein each signature sequence of the at least two signature sequences is used as a dedicated pilot of at least one data stream of each UE of at least two UEs;
• and (b) performing spreading on the at least two signature sequences, wherein each signature sequence of the at least two signature sequences is used as dedicated pilots of at least two data streams of at least one UE;
• and
• a calculating unit, configured to implement at least one of the group consisting of (a) obtaining a precoding matrix, and (b) calculating a composite channel matrix by using the received dedicated pilots and the at least two signature sequences sent by the network side, wherein the composite channel matrix is a product of a channel matrix of all receive antennas of the UE and a precoding matrix of all the data streams of the UE.