Pre-coding method for spatial multiplexing in multiple input and output system

摘要

The present invention relates to a pre-coding method for spatial multiplexing, comprising the steps of: performing a beam search for beam forming with a receiver device equipped with multiple antennas to perform pre-coding for spatial multiplexing in a transmitter device equipped with multiple antennas; transmitting a first packet including at least one or more training sequences to the receiver device after completion of said beam search; receiving, from the receiver device, a second packet including feedback information for pre-coding, determined in the receiver device by using the training sequences; and performing pre-coding for spatial multiplexing, onto the data stream to be transmitted to the receiver device, by using the pre-coding matrix calculated on the basis of the feedback information.

主权项

1. A method for performing spatial multiplexing (SM) precoding in a wireless access system supporting a wireless video area network (WVAN), the method performed by a transmitting device including a plurality of antennas and comprising:
performing a SM high-rate physical (HRP) beam searching process for selecting at least one optimized beamforming antenna group with a receiving device that includes a plurality of antennas; transmitting a first packet comprising at least one spatial multiplexing training sequence that is used to calculate a spatial precoding matrix to the receiving device, if channel matrix rank is estimated greater than one after performing the SM HRP beam searching process; receiving a second packet comprising feedback information for the spatial precoding matrix from the receiving device, wherein the spatial precoding matrix that is calculated by using the at least one spatial multiplexing training sequence; and performing spatial multiplexing precoding for data streams to be transmitted to the receiving device, by using the spatial precoding matrix, wherein the first packet is transmitted in accordance with a HRP mode and the second packet is received in accordance with a low-rate physical (LRP) mode, wherein the WVAN supports a HRP layer for the HRP mode and a LRP layer for the LRP mode, and wherein during the SM HRP beam searching process, the transmitting device iteratively transmits a first training sequence, receives feedback information for the first training sequence for a number of times equal to a predetermined value and applying an antenna array weight vector (AWV) to the at least one optimized beamforming antenna group based on the feedback information for the first training sequence.