CN-121983783-A - Indoor base station general sense integrated antenna layout structure and system

Abstract

The invention discloses an indoor base station general sense integrated antenna layout structure and system, and belongs to the technical field of wireless communication and perception fusion. The structure comprises an annular substrate (1), M communication antenna units (2) and N sensing antenna units (3), wherein the communication units are alternately and sparsely arranged along the circle of the annular substrate, the communication units adopt horizontal polarization, the working frequency range is lower than 6GHz, the sensing units adopt vertical polarization, the working frequency range is 24-30 GHz, and a signal processing module (4) is arranged in the center. Through a triple mechanism of space isolation, polarization orthogonality and frequency band dislocation, the coupling isolation degree of the through signals is more than or equal to 28 dB, 180-degree blind area coverage is avoided, the personnel positioning error is less than 0.3 m, and communication and sensing concurrency is supported. Compact structure can directly integrate in current indoor pico basic station, is applicable to scene such as wisdom mill, market, hospital. The actual measurement data shows that the perceived refresh rate is increased to 120 Hz, and the communication error rate is reduced to 1e-6 level.

Inventors

• CHENG LONG

Assignees

• 程龙

Dates

Publication Date

20260505

Application Date

20260319

Claims (2)

1. 1. An indoor base station leads to integrative antenna layout structure of sense, characterized by comprising: a ring-shaped substrate (1) made of a high-frequency material; The M communication antenna units (2) and the N sensing antenna units (3) are respectively arranged along annular substrates of different circles, so that one circle of communication antennas and one circle of sensing antennas are met, the communication antenna units and the N sensing antenna units are alternately arranged, and meanwhile sparse distribution is met, and the communication antenna units and the sensing antenna units are alternately arranged; The communication antenna unit (2) adopts horizontal polarization, the working frequency band comprises a communication frequency band below 6GHz, the sensing antenna unit (3) adopts vertical polarization, and the working frequency band is 24-30GHz of a millimeter wave frequency band; and the central signal processing module (4) is positioned at the geometric center of all the annular substrates (1) and is respectively connected with all the antenna units through microstrip transmission lines.
2. 2. An indoor base station general sense integrated antenna system, comprising the antenna layout structure of claim 1, further comprising A communication signal processing unit (5) for generating a downlink communication signal and transmitting the downlink communication signal through the communication antenna unit (2) to receive an uplink communication signal; the sensing signal processing unit (6) is used for generating a linear frequency modulation continuous wave LFMCW sensing signal, transmitting the linear frequency modulation continuous wave LFMCW sensing signal through the sensing antenna unit (3), receiving an echo signal and resolving target position and speed information; the communication radio frequency front end module (7) comprises a power amplifier, a low noise amplifier and a radio frequency switch, and realizes signal receiving and transmitting switching; The sensing radio frequency front end module (8) comprises a power amplifier, a low noise amplifier and a radio frequency switch, so as to realize signal receiving and transmitting switching; and the time-frequency synchronization unit (9) provides a unified clock reference for the communication signal processing unit (5) and the perception signal processing unit (6).

Description

Indoor base station general sense integrated antenna layout structure and system Technical Field The invention relates to the technical field of wireless communication and radar perception fusion, in particular to a physical layout, polarization design and system integration scheme of an integrated sense of presence (ISAC) antenna in a 5G-Advanced/6G indoor small base station, which is suitable for indoor scenes with high requirements on communication quality and environment perception, such as intelligent buildings, industrial Internet, AR/VR and the like. Background Three major bottlenecks exist in the current indoor small base station communication scheme: The function conflict is that the common antenna needs time division switching, the perceived refresh rate is low (< 30 Hz), and the real-time behavior recognition requirement can not be met; the interference is serious, namely, the communication strong signal is coupled to the sensing receiving link, the actual measurement isolation is only 12-15 dB (refer to IEEE TWC 2023), and the sensing signal to noise ratio is deteriorated; Coverage dead zone, wherein a linear array (such as 4T 4R) has a perceived dead angle behind the base station side, and indoor positioning error is more than 1m (3 GPP TR 38.858 data). Although the patent proposes a dual-frequency antenna, the problem of space coupling caused by layout is not solved, and in addition, the patent adopts a coplanar waveguide, so that the structure is complex and the miniaturization is difficult. Therefore, there is a need for an antenna layout scheme with simple structure, high isolation and no blind coverage. Disclosure of Invention The invention aims to provide an indoor general sense integrated antenna layout structure which has low cost, high reliability and easy deployment, and realizes concurrence of communication and sensing functions, low interference and high precision. The technical scheme is as follows: space isolation, namely, the communication and perception units are in physical alternation and annular sparse arrangement, and the edge distance is increased; polarization isolation, namely, the communication unit adopts horizontal polarization, the sensing antenna adopts vertical polarization, and the theoretical isolation degree is improved by 28 dB; Frequency band isolation, namely, the sensing adopts a millimeter wave frequency band (24-30 GHz), and is naturally isolated from a Sub-6 GHz communication frequency band and a U6G frequency band. The beneficial effects are that: The through-sense isolation degree is actually measured to be 28.5 dB (tested by a vector network analyzer), and is improved by 13 dB compared with the traditional scheme; 180 degrees of full coverage, no perception blind area (darkroom test); perceived refresh rate 120 Hz (concurrent mode), communication error rate 1.2x1e-6; The pico base station antenna module can be directly replaced, and the deployment cost is reduced by 40%. Drawings Fig. 1 is a top view of an antenna layout structure Fig. 2 is a diagram of an antenna transceiver system. Detailed Description Example scheme: The annular substrate 1 is formed by a Rogers RO4003C plate (epsilonr=3.55, tan delta=0.0027), the radius R=10 cm, the thickness of the annular substrate is 1.52 mm, and the back surface of the annular substrate is coated with copper (0.5 oz) to serve as a reflecting layer; the antenna unit comprises N=32 (M=16), θ=45°, a communication unit which is a 3.5 GHz rectangular microstrip patch (size 22×18 mm), and a sensing unit which is a 26 GHz H slot antenna (size 8×6 mm); the connection is that the width of the microstrip line is 1.2 mm (50Ω) and the length is less than or equal to lambda/4; The system comprises a communication signal processing unit (5) which adopts a high-pass SDR9150, a perception signal processing unit (6) which generates a bandwidth 400 MHz LFMCW signal, and a time-frequency synchronization unit (9) which provides a 10 MHz clock. The working flow is as follows: (1) The base station is arranged at the center of the indoor ceiling; (2) The communication antenna unit (2) continuously receives and transmits 5G NR signals; (3) The sensing antenna unit (3) transmits 1 LFMCW pulse (duty cycle 8.3%) every 8.3 ms; (4) The sensing antenna unit (3) receives the echo, the target DOA is solved through the MUSIC algorithm, and the coordinate is output by combining the distance information; (5) The communication and perception data are integrated by a central signal processing module (4) and output to a service platform. Test results Isolation S21 (communication transmission→perceived reception) = -28.5 dB (KEYSIGHT N5227B); positioning, namely 10 testers walk tracks, wherein rmse=0.23 m; Communication, BLER <1e-5 under 256QAM modulation; temperature rise, namely, working for 2 hours under full load, wherein the temperature of the substrate is less than or equal to 45 ℃. In summary, the novel antenna array mode provided by the inven