Hybrid precoding method and system for beam offset compensation

An offset compensation and precoding technology, which is applied in transmission systems, radio transmission systems, electrical components, etc., can solve the problems of high computational complexity and high hardware cost, and achieve improved signal-to-noise ratio, low hardware cost, and improved beam deviation The effect of target users

Pending Publication Date: 2021-12-10
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] In view of the above defects or deficiencies of the prior art, the present invention provides a hybrid precoding method and system for beam offset compensation, aiming to overcome the high hardware cost and high computational complexity existing in the existing digital precoding compensation scheme question

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  • Hybrid precoding method and system for beam offset compensation
  • Hybrid precoding method and system for beam offset compensation

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Embodiment

[0031] Consider a mmWave massive MIMO system where the carrier center frequency f c =28GHz, the bandwidth is 100MHz, and the transmitting antenna is N t =8, receiving antenna N r =[8:16:152], the antenna spacing d is the center carrier frequency wavelength λ c half of the number of paths N p =8, the angle of arrival (Angle of Arrival, AoA) and the angle of departure (Angle of Departure, AoD) are randomly generated within the range (-π, π), and the number of subcarriers K=128. A hybrid precoding method for beam offset compensation provided by the present invention is applied to the system to compensate the beam offset phenomenon in the millimeter-wave massive MIMO system, thereby improving system capacity. Specifically include the following steps:

[0032] (1) By averaging the channel state information H[k] of subcarriers on different frequencies, a frequency-independent equivalent channel is obtained

[0033] (2) Extract the average channel matrix The phase of the ana...

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Abstract

The invention discloses a hybrid precoding method and system for beam offset compensation, and belongs to the technical field of millimeter wave large-scale multiple antennas. The method comprises the following steps: obtaining a frequency-independent average channel matrix through an average subcarrier channel; performing phase extraction on the average channel matrix to obtain an analog pre-coding matrix, and satisfying a constant modulus constraint condition of analog pre-coding; regarding the channel subjected to the analog pre-coding effect as an equivalent channel, and obtaining a digital pre-coding matrix for the equivalent channel by using a zero-forcing pre-coding algorithm; and multiplying the analog pre-coding matrix by the digital pre-coding matrix to obtain a final hybrid pre-coding matrix. According to the invention, a certain degree of beam offset compensation effect can be obtained, and the method has the advantages of simple design, low system overhead and low calculation complexity.

Description

technical field [0001] The invention belongs to the technical field of millimeter-wave large-scale multi-antennas, and more specifically, relates to a hybrid precoding method and system for beam offset compensation. Background technique [0002] The millimeter wave frequency band contains huge spectrum bandwidth resources, making millimeter wave technology one of the options to solve the problem of scarcity of spectrum resources in current wireless communications. In the millimeter-wave massive multi-antenna (Multi-Input Multi-Output, MIMO) communication system, with the increase of bandwidth and array size, the transmission delay of the electromagnetic wave signal on the antenna array is equivalent to the symbol period and cannot be ignored. Called the spatial broadband effect (Spatial-Wideband Effect). The spatial broadband effect will also lead to beam shift (Beam Squint) in the frequency domain, and the degree of beam shift is proportional to the level of the spatial br...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0456
CPCH04B7/0465
Inventor 彭薇朱爱民谢一梅江涛
Owner HUAZHONG UNIV OF SCI & TECH
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