Hybrid beamforming algorithm for massive MIMO

A hybrid beam and beamforming technology, applied in the field of MIMO communication, can solve difficult problems

Active Publication Date: 2019-02-01
FUDAN UNIV
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  • Abstract
  • Description
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Problems solved by technology

However, if a traditional communication receiver is used, the digital domain needs to process hundreds of high-speed code streams in real time, which is very difficult

Method used

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  • Hybrid beamforming algorithm for massive MIMO
  • Hybrid beamforming algorithm for massive MIMO
  • Hybrid beamforming algorithm for massive MIMO

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0118] The channel model we use is a narrowband millimeter wave cluster channel model:

[0119]

[0120] Where the multipath gain is α l ~CN(0,1), a t (θ l ) And a r (φ l ) Are the antenna array responses of the transmitter and receiver respectively; where θ l Is the departure angle, φ l Is the angle of arrival. Our simulation uses a uniform linear array (ULA). For angle θ, the array response is:

[0121]

[0122] Where λ is the wavelength of the signal, Is the antenna spacing, a r (φ l ) Has a similar form.

[0123] The system we actually simulated is a 64×16 MIMO system (M t =64, M r =16), where N RF =N s =8, the multipath number L is 15. image 3 The results show the comparison of our algorithm's spectrum efficiency under the limitation of different RF chains. Including infinite precision phase shifter network (-◇-), 1bit resolution phase shifter (-ο-), 2bit resolution phase shifter Switch network (-*-), phase shifter plus switch network (--). The results show that the perfor...

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Abstract

The invention belongs to the field of millimeter wave massive MIMO systems, in particular to a hybrid beamforming algorithm for massive MIMO. This new algorithm is designed to jointly optimize analogdomain beamforming and digital domain beamforming to maximize spectral efficiency. The invention is divided into two parts: an algorithm of analog beamforming; and the acquisition of a digital beamformer according to the "water injection method" when an analog beamformer is given. The algorithm is applicable to different types of analog networks, including continuously adjustable phase shifter networks, finite-bit adjustable phase shifter networks, switching networks, and the like. The simulation results show that the performance of the algorithm is close to the performance of the optimal all-digital beamforming, and the hybrid beamforming based on the switching networks is close to the performance of the phase shifter networks, which is more conducive to engineering implementation.

Description

Technical field [0001] The invention belongs to the field of MIMO communication, and specifically relates to a hybrid beamforming algorithm for massive MIMO. Background technique [0002] 5G millimeter wave technology increases the communication bandwidth by hundreds of megahertz or even kilohertz, and installs dozens or even hundreds of antennas in base stations, which can greatly increase the channel capacity of the cell. However, if a traditional communication receiver is used, the digital domain needs to process hundreds of high-speed streams in real time, which is very difficult. Researchers propose to perform analog beamforming (Analog Beamforming / ABF) before the digital-to-analog converter (ADC), compress the high-dimensional signals received by M antennas to N dimensions (N<<M), and pass With ABF, the antenna gain of massive MIMO is preserved, while the signal dimension is greatly compressed, thereby greatly reducing the amount of calculation in the digital domain ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04B7/0456
CPCH04B7/0456H04B7/0617
Inventor 蒋轶冯艺萌
Owner FUDAN UNIV
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