FIELD: information technology.
SUBSTANCE: techniques for sending a MIMO transmission using a combination of cyclic delay diversity and precoding are described. A set of delays (e.g., zero delay, small delay, and large delay) for cyclic delay diversity and a set of precoding matrices may be supported. In one design, a Node B may select a delay specifically for user equipment (UE) or for a set of UE served by the Node B. In another design, UE may evaluate different combinations of precoding matrix and delay, determine the combination with the best performance, and send that combination of precoding matrix and delay to Node B. Node B may perform precoding with the precoding matrix and then processing for cyclic delay diversity based on the selected delay. Alternatively, Node B may perform processing for cyclic delay diversity based on the selected delay and then precoding with the precoding matrix.
EFFECT: high reliability and achieving high efficiency.
34 cl, 15 dwg
