Patent ID: 9397744
Filing Date: 2016-07-19
CPC Classification: H04B,H04L

Claim Text:
1. A data transmission method of a source node in a cooperative communication system, comprising: performing a beamforming to a relay node, including forming a first transmit antenna pattern of the source node such that a first beam direction of an antenna of the source node is directed towards the relay node; performing a beamforming to a destination node, including forming a second transmit antenna pattern of the source node such that a second beam direction of the antenna of the source node is directed towards the destination node; and transmitting, by the source node, data selectively to the relay node and to the destination node in two different time slots, including wherein the source node modulates the data using QPSK (quadrature phase shift keying) or 16 QAM (quadrature amplitude modulation), and transmits the modulated data to the relay node in the first time slot, wherein the relay node estimates the data received from the source node, encodes the estimated data, and transmits the encoded estimated data to the destination node in the second time slot, wherein the source node encodes the data, and transmits the encoded data to the destination node in the second time slot, wherein the data and the estimated data are respectively encoded by the source node and the relay node and are transmitted to the destination node in the second time slot, wherein the data includes odd symbols and even symbols constituting the data, wherein the odd symbols are derived by applying a conjugation to the even symbols, or the even symbols are derived by applying a conjugation to the odd symbols, and wherein the relay node transmits the data using FD (Full Duplex) or HD (Half Duplex).