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Optical codebook hybrid beamforming method for 5g C-RAN system

A 5GC-RAN, hybrid beam technology, applied in the field of optical codebook hybrid beamforming, to achieve the effect of reducing cost, eliminating tunable devices, and reducing cost and complexity

Active Publication Date: 2021-06-04
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So the control data must be transmitted to the AAU through the fronthaul link, which introduces additional fronthaul delay and bandwidth

Method used

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  • Optical codebook hybrid beamforming method for 5g C-RAN system
  • Optical codebook hybrid beamforming method for 5g C-RAN system
  • Optical codebook hybrid beamforming method for 5g C-RAN system

Examples

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Embodiment

[0048] figure 1 It is a schematic diagram of an optical codebook hybrid beamforming method for a 5G C-RAN system according to the present invention.

[0049] In this example, if figure 1 As shown, the present invention is an optical codebook hybrid beamforming method for 5G C-RAN system, comprising the following steps:

[0050] S1, give a person with N s N t RF and N r RF radio frequency (RF) link, the hybrid precoding system conforms to the 5G millimeter wave C-RAN structure; where, N s ≤N t RF ≤M t ,M t is the number of antennas at the transmitter;

[0051] S2, using a multi-wavelength laser source (MLS) to generate m uniformly spaced optical carriers with a wavelength interval of Δλ;

[0052] Express the wavelengths of m optical carriers as a 1×m vector;

[0053] p s ={λ 1 ,λ 2 ,...,λ m}

[0054] will vector p s Mapping generates an M t ×K's optical codebook W OC :

[0055] ID: 1 2 K

[0056]

[0057] Among them, K is the number of codewords, i...

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Abstract

The invention discloses an optical codebook hybrid beamforming method for 5G C-RAN system. Firstly, a radio frequency link is allocated to the transmitting end and the receiving end of the hybrid precoding system, and then multiple evenly spaced beams are generated by using a multi-wavelength laser source. The optical carrier, and then generate the optical codebook; then complete the N in sequence based on the optical codebook t RF The RF link performs analog precoding and digital precoding processing, and then modulates through the electro-optical modulator, so that the precoding result is modulated to the selected optical carrier, and then passes through the add-drop multiplexer and passive The demultiplexer performs related processing of hybrid beamforming, and finally transmits through the wireless channel at the antenna of the transmitting end, and is received by the user.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and more specifically, relates to an optical codebook hybrid beamforming method for a 5G C-RAN system. Background technique [0002] Emerging services in wireless communication, such as 4K / 8K high-definition video, virtual / augmented reality, require a large amount of transmission bandwidth, and the integration of multiple input multiple output (MIMO) and millimeter wave (mmWave) communication is considered to be an effective way to achieve 5G capacity KPI Way. [0003] MIMO technology, especially hybrid beamforming technology, is critical to enable high data rate mmWave communications. Considering the constraints of cost and energy consumption in the early deployment of 5G, hybrid beamforming is a feasible solution. However, the implementation of millimeter wave communication in practical applications still faces many difficulties. On the one hand, the carrier frequency of milli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0456H04B7/06
CPCH04B7/0456H04B7/0617
Inventor 张崇富郑伟黄欢杨牧川凌云邱昆
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA