Millimeter wave hybrid analog/digital beam forming method based on improved Riemann manifold optimization

A beamforming and mixed-mode technology, applied in the field of beamforming and mixed-mode/digital beamforming, can solve problems such as high computational complexity and limit practical applications, and achieve improved spectral efficiency, reduced algorithm complexity, and reduced computing time. Effect

Inactive Publication Date: 2019-12-24
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI +1
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But in general, the existing methods still have problems such as high co

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  • Millimeter wave hybrid analog/digital beam forming method based on improved Riemann manifold optimization
  • Millimeter wave hybrid analog/digital beam forming method based on improved Riemann manifold optimization
  • Millimeter wave hybrid analog/digital beam forming method based on improved Riemann manifold optimization

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[0033] The technical content of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] As mentioned above, the traditional MIMO technology uses an all-digital beamforming scheme, and each antenna element requires specialized baseband and radio frequency hardware, including low-noise amplifiers, down-converters, analog-to-digital / digital-to-analog conversion, etc., which brings high costs and high power consumption issues. When the number of base station antennas is very large, it is difficult to assign a separate radio frequency (RF) chain to each antenna. In order to solve the above problems, millimeter-wave communication systems need special analog or radio frequency processing, that is, analog beamforming uses phase shifters to impose constant mode constraints, but this will result in poorer performance of analog beamforming than full digital beamforming. To this end, a hybrid beamfor...

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Abstract

The invention discloses a millimeter wave hybrid analog/digital beam forming method based on improved Riemann manifold optimization. The millimeter wave hybrid analog/digital beam forming method comprises the following steps of projecting conjugate gradients to a tangent space to obtain Riemann gradients; searching a point in the tangent space along the Riemann gradient, determining a step lengthby using a Wolfe-Powell criterion, and backtracking the search point to the Riemann manifold; and when a stop condition is met, obtaining an analog beam forming matrix and a digital beam forming matrix through calculation. According to the method, while the algorithm complexity is reduced, the problem that minimum points are missed in the search process is avoided, so that the calculation time isgreatly shortened, the bit error rate is reduced, and the problems that the full-digital beam forming spectral efficiency cannot be achieved through hybrid beam forming and the algorithm complexity istoo high are solved.

Description

technical field [0001] The invention relates to a beamforming method, in particular to a hybrid mode / digital beamforming method based on improved Riemannian manifold optimization used in a millimeter wave communication system, and belongs to the technical field of millimeter wave communication. Background technique [0002] At present, the fifth generation mobile communication network (5G) has begun to enter the commercialization stage. As one of the key technologies of 5G, millimeter wave (mmWave) communication can solve the problem of insufficient bandwidth in the current mobile communication system, and is generally considered to be the most potential technical direction in 5G. [0003] In a millimeter wave communication system, large signal attenuation is overcome by means of narrow beams and beam forming (Beam forming) in massive MIMO (Multiple Input Multiple Output) technology. In order to compensate for the severe path loss and penetration loss in the mmWave band, la...

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Application Information

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IPC IPC(8): H04B7/0426
CPCH04B7/043
Inventor 陈俊飞易辉跃许晖张武雄裴俊
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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