Phased array beam forming method for suppressing inter-beam interference
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A beamforming, phased array technology
Pending Publication Date: 2022-07-15
SOUTHEAST UNIV
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However, since only the phase of the phase shifter is adjustable, each element in the phased array has a constant modulus constraint. Therefore, how to implement beamforming design for suppressing inter-beam interference on the phased array is the key point of the millimeter-wave multi-user wireless communication system. Difficulties
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Embodiment 1
[0041] see Figure 1-Figure 5 , this embodiment provides a phased array beam method for suppressing inter-beam interference for a millimeter-wave multi-user wireless communication system, the method specifically includes the following steps:
[0042] Step S1, build a multi-user wireless communication system model based on millimeter waves, wherein the structure of the model is as follows: figure 1 shown, specifically:
[0043] For the downlink communication scenario where a base station serves K users, the users are all single-antenna users, the base station adopts a fully connected hybrid beamforming architecture, and the number of RF links is equal to the number of users, namely N RF =K, the antenna array has N t A uniform linear array with a root antenna and antenna spacing of half a wavelength.
[0044] Specifically, taking the qth user as an example, its downlink signal transmission model can be established as:
[0045]
[0046] where y q Represents a signal recei...
Embodiment 2
[0068] see Image 6 , this embodiment provides a phased array beam design method for suppressing inter-beam interference for a radar system, the method is based on a radar antenna array with an array element interval of half a wavelength, and the number of array elements is N t , the array is arranged as a uniform linear array. The method specifically includes the following steps:
[0069] Step S1, determine the radar system, and construct its beam pattern expression, which specifically includes:
[0070] Step S101, for the uniform linear array, its array steering vector in the θ direction is expressed as:
[0071]
[0072] Step S102, set the beamforming vector to be w, then its corresponding beam pattern can be expressed as:
[0073] f(θ)=|w H a(θ)| 2
[0074] where |·| represents the modulo value.
[0075] Step S2, design for the beam pattern constructed in step S1, and the design includes: constructing an optimization with the linear combination of minimizing the ...
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Abstract
The invention discloses a phased array beam forming method for suppressing inter-beam interference, and the method comprises the steps: introducing a weight factor under the condition of meeting the constant modulus constraint of a phased array, taking the minimization of the linear combination of the power of a beam in an interference direction and the power of the beam in a main lobe central region as an optimization target, and employing a manifold optimization tool box to optimize the beam interference. A single or multiple beams are optimally designed. In a millimeter wave multi-user communication system, the average and rate performance of approximate hybrid beam forming can be achieved under the condition that only analog beam forming is used and digital beam forming is not used, and the interference between users is effectively inhibited. In a radar system, compared with an existing method, the phased array beam forming method provided by the invention has better interference suppression performance.
Description
technical field [0001] The present invention relates to the technical field of phased array beamforming for suppressing inter-beam interference, in particular to a phased array beamforming method for suppressing inter-beam interference. Background technique [0002] In recent years, with the development of wireless communication, wireless telephone services have been continuously upgraded, and mobile communication systems are facing explosive data traffic growth and massive device connections, which stimulates research on the application of millimeter waves to wireless communication. The wavelength of millimeter wave is short, only a few millimeters, which enables millimeter wave communication to be carried out under the condition of smaller antenna size. The transceiver end can be configured with a large-scale antenna array in a limited area. The millimeter-wave system mainly uses this large-scale antenna. The array forms beams to achieve high-rate transmission. However, d...
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