KR-20260063649-A - APPARATUS AND METHOD FOR ALLOCATING SENSING FREQUENCY FOR INTEGRATED SENSING AND COMMUNICATION DEVICE

KR20260063649AKR 20260063649 AKR20260063649 AKR 20260063649AKR-20260063649-A

Abstract

The present invention relates to a sensing frequency allocation device and method for an Integrated Sensing and Communication (ISAC) device, wherein the sensing frequency allocation device for a sensing device according to the present invention comprises: a memory including one or more instructions; The system includes a processor that executes one or more instructions stored in the memory, wherein the processor calculates a ratio of using less frequency of the analog beam for sensing of the sensing device, calculates power to be used for digital post-processing using the maximum power to be used for sensing, the set of subcarriers to be used for sensing, and the correlation value for the subcarriers to be used for sensing according to the ratio of using less frequency, calculates the sum of total correlations that can be obtained when the same power is used for each subcarrier to be used for sensing, and calculates a digital post-processing matrix for the subcarriers to be used for sensing and the subcarriers not to be used for sensing using the power to be used for digital post-processing and the correlation value for the subcarriers to be used for sensing according to the relationship between the correlation for the subcarriers to be used for sensing and the sum of the total correlations, thereby having the effect of increasing the throughput of the entire system by minimizing the frequency usage of the analog beam while maintaining the SNR of the sensing beam even in near-field and beam squint environments.

Inventors

채찬병
김윤태
양시윤
유한주

Assignees

연세대학교 산학협력단

Dates

Publication Date: 20260507
Application Date: 20241030

Claims (10)

Memory containing one or more instructions; and A processor that executes one or more instructions stored in the memory above; Includes, The above processor is, Calculate the ratio of using less frequency of the analog beam for sensing of the sensing device, and Calculate the power to be used for digital post-processing using the maximum power to be used for sensing according to the ratio of using less of the above frequency, the set of subcarriers to be used for sensing, and the correlation value for the subcarriers to be used for sensing. Calculate the sum of the total correlations that can be obtained when the same power is used for each subcarrier to be used for sensing, and A sensing frequency allocation device for a sensing device, characterized by calculating a digital post-processing matrix for a subcarrier to be used for sensing and a subcarrier not to be used for sensing using the power to be used for digital post-processing and the correlation value for a subcarrier to be used for sensing, according to the relationship between the correlation of a subcarrier to be used for sensing and the sum of the total correlation.
In paragraph 1, A sensing frequency allocation device for a sensing device, characterized in that the above-mentioned sensing device is an Integrated Sensing and Communication (ISAC) device.
In paragraph 1, A sensing frequency allocation device for a sensing device, characterized in that the processor determines the ratio of frequency to be used in an analog beam for sensing by using the sum of the total correlations obtained when the same power is used for the subcarrier to be used for sensing.
In paragraph 2, A sensing frequency allocation device for a sensing device, characterized in that the processor allocates subcarriers not to be used for the sensing to the communication of the ISAC device.
In paragraph 1, A sensing frequency allocation device for a sensing device, characterized in that the processor calculates the digital post-processing matrix according to the direction and distance of the analog beam and generates it into a codebook.
A sensing frequency allocation method for a sensing device performed by a sensing frequency allocation device comprising one or more processors and memory: A step of calculating the ratio of using less frequency of the analog beam for sensing of the sensing device; A step of calculating power to be used for digital post-processing using the maximum power to be used for sensing, the set of subcarriers to be used for sensing, and the correlation value for the subcarriers to be used for sensing, according to the ratio of using the above frequency less; A step of calculating the sum of the total correlations obtainable when the same power is used for each subcarrier to be used for sensing; and A step of calculating a digital post-processing matrix for a subcarrier to be used for sensing and a subcarrier not to be used for sensing, using the power to be used for digital post-processing and the correlation value for the subcarrier to be used for sensing, according to the relationship between the correlation for the subcarrier to be used for sensing and the sum of the total correlation; A sensing frequency allocation method for a sensing device characterized by including
In paragraph 6, A method for allocating a sensing frequency for a sensing device, characterized in that the sensing device is an Integrated Sensing and Communication (ISAC) device.
In paragraph 6, A method for allocating a sensing frequency for a sensing device, wherein the step of calculating the sum of the total correlations is characterized by determining the ratio of frequency to be used in an analog beam for sensing by using the sum of the total correlations obtained when the same power is used for the subcarrier to be used for sensing.
In Paragraph 7, A step of allocating subcarriers not to be used for the above sensing for communication of the ISAC device; A sensing frequency allocation method for a sensing device, characterized by further including
In paragraph 6, After the step of calculating the above digital post-processing matrix, A step of generating a codebook by calculating the above digital post-processing matrix according to the direction and distance of the analog beam; A sensing frequency allocation method for a sensing device, characterized by further including

Description

Apparatus and Method for Allocating Sensing Frequency for Integrated Sensing and Communication Device The present invention relates to an Integrated Sensing and Communication (ISAC) device, and more particularly to a technology for allocating a sensing frequency for an ISAC device. An ISAC device refers to a device that simultaneously implements radar sensing and communication using a single communication device and signal waveform. It is a device that integrates sensing and communication into a single unit by beginning to use hardware and frequencies similar to a hybrid beamforming structure, which combines the advantages of digital and analog beamforming methods in radar systems. Communication using the conventional beam sweeping method proceeds in a process where the user terminal interprets the signal sent by the base station to the user terminal and provides feedback, which the base station then receives. However, since radar sensing allows the base station to directly receive and process signals reflected from objects such as user terminals without an intermediate signal processing step, it can estimate the channel faster compared to the beam sweeping method. Therefore, according to the ISAC device, a communication channel model can be designed using sensing information, and by utilizing this for communication, there is an advantage in obtaining the benefits of a low-complexity channel estimation process with a single device. However, as the frequency bandwidth used by ISAC devices widens and the number of antennas increases, there are problems such as beam squint and near-field effects. Figure 6 is a schematic diagram illustrating this beam squint phenomenon. Beam squint is a phenomenon in which the direction of the beam shifts according to the frequency when the frequency bandwidth is widened (Ultra-wideband). Since array antennas are designed to match the center frequency (f c ), there is a problem in that the beam cannot be formed in the intended direction at frequencies (f min , f max ) that are off from the center frequency. Figure 7 is a diagram schematically showing the near-field effect. The near-field effect is a phenomenon that occurs when the physical size of an array antenna is large relative to its frequency due to the diameter (D) of the array antenna. When a user is located at a close distance (near-field) from the antenna array, the radio waves generated by each antenna fail to form plane waves and instead form spherical waves, resulting in a problem where the necessary gain cannot be obtained. The inventors of the present invention have made long-term research efforts to solve the problems caused by the beam squint phenomenon and near-field effect of the ISAC device as described above, and have come to complete the present invention, which provides a digital post-processing technology that can maintain the sensing SNR while using as little subcarrier as possible for sensing. FIG. 1 is a schematic structural diagram of a sensing frequency allocation device for an integrated sensing and communication device according to a preferred embodiment of the present invention. FIG. 2 shows an example of determining the ratio of less frequency to be used in a frequency allocation device for a sensing device according to a preferred embodiment of the present invention. FIG. 3 is a schematic flowchart for calculating the frequency allocation ratio of a sensing frequency allocation device for a sensing device according to a preferred embodiment of the present invention. FIG. 4 shows an example of digital post-processing in which a frequency is allocated according to a sensing frequency allocation device for a sensing device according to a preferred embodiment of the present invention. FIG. 5 is a schematic flowchart of a sensing frequency allocation method for a sensing device according to another preferred embodiment of the present invention. Figure 6 is a diagram schematically illustrating the beam squint phenomenon. Figure 7 is a diagram schematically showing the near-field effect. The above-mentioned objectives, means, and resulting effects of the present invention will become clearer through the following detailed description in conjunction with the attached drawings, and accordingly, a person skilled in the art to which the present invention pertains will be able to easily implement the technical concept of the present invention. Furthermore, in describing the present invention, if it is determined that a detailed description of known technology related to the present invention may unnecessarily obscure the essence of the present invention, such detailed description will be omitted. The terms used herein are for describing the embodiments and are not intended to limit the invention. In this specification, the singular form includes the plural form as appropriate unless specifically stated otherwise in the text. In this specification, terms such as “comprising,” “providing,” “arranging,” or “h