METHOD AND APPARATUS FOR SINGLE STREAM MULTI-BEAM TRANSMISSION AND RECEPTION IN WIRELESS COMMUNICATION SYSTEM

摘要

The present invention relates to a method and apparatus for transceiving a single data stream as multi-beam in a wireless communications system using hybrid beamforming that a digital precoder and an analog beamformer are combined. According to an embodiment of the present invention, a method for controlling a transmission signal comprises the following steps: determining a cyclic shift value to be applied to transmission signals transmitted through a plurality of layers, when the transmission signals are transmitted through the layers; circulating and moving the transmission signals which are transmitted through the layers depending on the cyclic shift value; and adding the circulated and moved transmission signals to transmit the same. According to the embodiment of the present invention, the amount of power amplifier (PA) back-off in a hybrid beamforming structure can be synchronized with the same level of the amount of the PA back-off which is considered in a conventional orthogonal frequency division multiplexing (OFDM) system. Herein, an average power of a PA input signal can be consistently maintained regardless of beam combination when the single stream multi-beam is transmitted.