Hybrid Beamforming Antenna Array Using Selection Matrix for Antenna Phase Calibration
A technology of antenna array and mixed beams, which is applied in the field of channel estimation in multi-user massive MIMO systems, can solve the problems of variable phase shifter loss, large beam power consumption, and inaccurate solutions, so as to reduce complexity, Effect of reduced power consumption and low power consumption
Active Publication Date: 2020-12-04
ROSS SCI LTD
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However, due to the presence of active components in the return RF chain, which is different from the forward RF chain, this solution is relatively less accurate, although less expensive than the above solutions
[0010] In addition to the problems presented by antenna calibration, current beamforming techniques suffer from excessive power consumption
For example, in digital beamforming (DBF), the RF chain must include many RFICs, power amplifiers, and ADCs / DACs, consuming a lot of power
Whereas in analog beamforming (ABF), the variable phase shifters in the RF chain have significant losses
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[0022] In the following description, beamforming systems and methods in MU-MIMO systems are listed as a preferred example. It will be apparent to those skilled in the art that modifications, including additions and / or substitutions, can be made without departing from the scope and spirit of the present invention. Certain specific details are omitted so as not to obscure the invention. However, the description of the present application will enable one skilled in the art to practice the teachings herein without experimentation.
[0023] see Figure 1a . The architecture of analog beamforming (ABF) is to have multiple antennas connected to and receiving feedback from a single transceiver. The beam signal is formed by using a separate power amplifier and a separate variable phase shifter for each antenna to phase shift each signal sent from the antenna. refer to Figure 1b , the architecture of digital beamforming (DBF) is in which each antenna is connected to a separate tra...
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A hybrid beamforming antenna array for a MU‑MIMO communication system, comprising: a single digital beamformer connected to M passive beamforming subarrays; said M passive beamforming subarrays, each of which has no The source beamforming subarray consists of: an RF transceiver feeding an RF chain; a 2 N input 2 N an output selection matrix with all inputs connected to the outputs of said single RF chain; and 2 N antennas, each of which is connected to and fed from one output of the selection matrix; wherein the digital beamformer feeds each RF transceiver of the passive beamforming subarray; the selection matrix does not have power dissipation components and without external control, it is configured as the 2 N One or more of the inputs receive feedback and at its 2 N output generates 2 N individual RF signal beams with progressive phase distribution; the hybrid beamforming antenna array has no antenna calibration network.
Description
[0001] cross-reference statement [0002] This application claims priority under the Paris Convention to U.S. Provisional Patent Application No. 62 / 307,582, filed March 14, 2016, the entire disclosure of which is incorporated herein by reference. technical field [0003] The present invention basically relates to a massive multiple-input multiple-output (MIMO) communication system, in particular to a method and device for channel estimation in a multi-user massive MIMO (MU-MIMO) system. Background technique [0004] Fifth-generation (5G) wireless networks have the potential to revolutionize communications infrastructure and business models in a wide variety of ways. One of the many technological advances in 5G networks is a completely new radio interface that is not bound by previous designs. The interface can employ massive MIMO and beamforming techniques in a single antenna array, which can greatly improve spectral efficiency and spatial diversity, while supporting multi...
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IPC IPC(8): H04L27/26
CPCH04B7/0617H04B7/0452H01Q1/246H01Q3/26H01Q3/40H01Q3/2682H04B7/0421H04B7/0695
Inventor 柳江平
Owner ROSS SCI LTD