Method and apparatus for transmitting signal in wireless communication system
A technology for transmitting signals and wireless access systems, applied in the field of analog beamforming and digital beamforming to transmit signals
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Embodiment approach 1
[0187] According to hybrid beamforming technology, analog beamforming and digital beamforming are performed simultaneously. When employing hybrid beamforming in massive MIMO systems, it is important to maintain the resolution of the beams and degrees of freedom for massive multi-user transmission. In Embodiment Mode 1, a hybrid beamforming technique that satisfies these two requirements will be described.
[0188] First, analog beamforming is described below. For analog beamforming, an RF terminal with a phase shifter is used. Analog beamforming superimposes beams emitted from multiple antenna elements to focus the beam's energy in a specific direction to create a sharp beam (doughnut or pencil shape). Herein, the beamforming direction can be adjusted by changing the value of the phase shift.
[0189] Analog beamforming causes the phase of an analog signal to be changed and causes the signal to be transmitted or received through multiple antennas. By analog beamforming, a ...
Embodiment approach 1-1
[0214] Figure 24An implementation of differentiating between multiple users in hybrid beamforming according to one embodiment of the invention is shown.
[0215] First, the antenna elements are divided into subgroups. For example, using something like Figure 20 with Figure 22 By method of method, the antenna elements can be divided into subgroups.
[0216] Thereafter, analog beamforming is performed for each subgroup. The analog beams formed by the subgroups have a wide beamwidth. Analog beamformers form beams in various directions to differentiate between multiple spaces.
[0217] A signal processor in the digital domain combines the multiple beams formed by the subgroups. Using the independent space-channel characteristics of the users in the space within the range to which the simulated beams point, weights for combining the multiple beams can be generated. Using this weight, multiple users can be distinguished from each other.
[0218] For example, when antenna ...
Embodiment approach 1-2
[0226] Figure 20 with Figure 22 The structure of allows each subgroup to have the freedom to create beams, so that each subgroup can simultaneously send beams in different directions. Figure 21 with Figure 23 The structure of can provide each PS / PA with freedom to create beams, thus allowing PS / PAs to transmit beams in different directions at the same time. Figure 25 The structure of can provide each subgroup and each PS / PA with degrees of freedom to create beams, thus allowing subgroups and PS / PAs to transmit beams in different directions simultaneously.
[0227] Distinguishing between regions means that the spaces in which the simulated beams point are different from each other. Analog beams improve channel conditions by focusing energy in specific directions. That is, in terms of channel conditions, areas where energy is concentrated are significantly different from other areas where energy is not concentrated. SDMA and TDMA can be employed to transmit signals to ...
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