A hybrid precoding algorithm for partially connected phase shifter network of large scale MIMO

A technology of precoding and phase shifter, applied in the field of MIMO communication

Active Publication Date: 2020-01-07
FUDAN UNIV
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Problems solved by technology

Traditional analog domain networks are mainly divided into fully connected structures and partially connected structures, b

Method used

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  • A hybrid precoding algorithm for partially connected phase shifter network of large scale MIMO
  • A hybrid precoding algorithm for partially connected phase shifter network of large scale MIMO
  • A hybrid precoding algorithm for partially connected phase shifter network of large scale MIMO

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Embodiment 1

[0135] The channel model we use is a narrowband millimeter wave cluster channel model:

[0136]

[0137] Among them, the multipath gain is α l ~CN(0,1), a t (θ l ) And a r (φ l ) Are the antenna array responses at 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), and the array responses at the transmitter and receiver are:

[0138]

[0139] Where λ is the wavelength of the signal, Is the antenna spacing, assuming that the multipath number L is 15, and its angles are randomly distributed between 0° and 360°.

[0140] The structure we built is like figure 1 (That is, the hybrid precoding structure of the transmitter in the MIMO system). in image 3 , The system we actually simulated is a 64×16 MIMO system (M t =64,M r = 16), where N RF =N s = 8. image 3 The results show the performance comparison of Algorithm 2 under the phase shifter network with limited bit resolution under d...

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Abstract

The invention belongs to the technical field of MIMO communication, and particularly relates to a hybrid precoding algorithm for a partially connected phase shifter network for large-scale MIMO. The algorithm aims to jointly optimize analog domain precoding and digital domain precoding so as to maximize spectral efficiency. The hybrid precoding algorithm is divided into two parts: 1, an analog precoding algorithm; and 2, after an analog precoder is given, obtaining a digital precoder according to a water injection method. The algorithm is suitable for phase shifter networks with different resolutions, including a continuously adjustable phase shifter network, a 1-bit phase shifter network and a 2-bit phase shifter network. A simulation result shows that the difference between the algorithmperformance and the optimal full-digital precoding is about 5dB; and the number of the phase shifters is greatly reduced, so that engineering realization is facilitated.

Description

Technical field [0001] The invention belongs to the field of MIMO communication technology, and specifically relates to a hybrid precoding algorithm of a partially connected phase shifter network. 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 improve spectrum efficiency. However, although the all-digital precoding scheme can fully achieve higher spectral efficiency, the scheme requires as many radio frequency (RF) links as the number of antennas, which will bring higher hardware costs and power consumption. In recent years, researchers have proposed to insert an analog domain network between the antenna array and the radio frequency link. This way, through the joint design of the analog precoding network and the digital precoding matrix, the antenna gain of massive MIMO can be preserved, and at the sam...

Claims

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Application Information

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IPC IPC(8): H04B7/0413H04B7/0456
CPCH04B7/0413H04B7/0456
Inventor 蒋轶冯艺萌
Owner FUDAN UNIV
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