HỆ THỐNG ƯỚC LƯỢNG HƯỚNG SÓNG TỚI ỨNG DỤNG CHO THÔNG TIN VÔ TUYẾN DẢI TẦN MILIMET

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Tác giả: Thi Phuong Thao Hoang, Thanh Quang Vu, Van Yem Vu

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học và Công nghệ Năng lượng, 2023

Mô tả vật lý: tr.112

Bộ sưu tập: Metadata

ID: 340311

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Millimeter-wave wireless communications systems are proving many advantages in comparison to systems operating at the lower frequency band thanks to their wide bandwidth, ability to provide high-speed and multimedia services. However, the transmission loss in the system is large, so it is necessary to have beam forming to compensate for this loss as well as to implement interference reduction techniques in order to increase system quality. In order to perform beam forming, determining the direction of arrival (DOA) of the incident wave of the radio signal source is a necessary condition. This paper proposes a millimeter-wave multi-antenna system for the estimation of DOA of radio signal in the azimuth plane operating at 28 GHz. The proposed system for determining the DOA of correlated and uncorrelated signals in millimeter-wave applications utilizes the digital intermediate frequency (IF) software-defined radio receiver architecture combining with a 90 degree phase shifter as an analog inphase-quadrature demodulator and multipath signal classification (MUSIC) algorithm associated with the improved spatial smoothing technique. The system is modeled and simulated to demonstrate the ability of determining the DOA of a radio signal operating at a center frequency of 28 GHz. The proposed system is modeled and simulated for the purpose of estimating the DOA of signal of interest at 28 GHz. The proposed solution is capable of estimating the DOA of the correlated and uncorrelated signals with high accuracy, an error of less than 1 degree, and a low number of samples (snap shots) by using software defined receiver architecture based on phase shifter and demodulation scheme by software, as well as superresolution algorithms.Thông tin vô tuyến ở dải sóng milimet (mm) đang chứng tỏ nhiều ưu điểm so với các hệ thống ở dải sóng thấp hơn do băng thông rộng, khả năng cung cấp dịch vụ tốc độ cao, dịch vụ đa phương tiện. Tuy nhiên suy hao truyền sóng trong hệ thống lớn, do đó cần phải có định hướng búp sóng để bù đắp phần suy hao này cũng như thực hiện kỹ thuật giảm can nhiễu, tăng chất lượng hệ thống. Để thực hiện việc định hướng b p sóng, việc xác định hướng sóng tới của nguồn tín hiệu vô tuyến là điều kiện cần. Bài báo đề xuất một hệ thống nhiều anten xác định hướng sóng tới của tín hiệu vô tuyến ở mặt phẳng phương vị trong hệ thống vô tuyến ở dải sóng mm hoạt động ở tần số 28 GHz. Hệ thống xác định hướng sóng tới của tín hiệu tương quan và không tương quan trong hệ thống vô tuyến ở dải sóng mm dựa trên kiến tr c máy thu trung tần định nghĩa chức năng bằng phần mềm với bộ di pha tín hiệu 90 độ để thực hiện chức năng tương tự như bộ giải điều chế cầu phương và thuật toán phân loại tín hiệu đa đường kết hợp với kỹ thuật làm mịn không gian. Hệ thống được mô hình hóa và mô phỏng để minh chứng khả năng xác định hướng sóng tới của tín hiệu vô tuyến hoạt động ở tần số trung tâm 28 GHz. Giải pháp đề xuất có khả năng xác định hướng sóng tới của tín hiệu cả tương quan và không tương quan với độ chính xác cao, sai số nhỏ hơn 1 độ và với số lượng mẫu trong miền thời gian ít thông qua việc sử dụng kiến trúc giải điều chế, di pha bằng phần mềm và thuật toán có độ phân giải cao.

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