BẢO MẬT LỚP VẬT LÝ TRONG MẠNG VÔ TUYẾN NHẬN THỨC DẠNG NỀN VỚI THÔNG TIN KÊNH TRUYỀN RAYLEIGH KHÔNG HOÀN HẢO

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Tác giả: Thiểm Đỗ Đắc

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học - Đại học Thủ Dầu Một, 2024

Mô tả vật lý: tr.55-64

Bộ sưu tập: Báo, Tạp chí

ID: 445836

Thêm vào giỏ Liên kết toàn văn

Bài báo này khảo sát và đánh giá hiệu năng bảo mật lớp vật lý của mạng vô tuyến nhận thức dạng nền (UCRN - Underlay Cognitive Radio Netwwok) với thông tin kênh truyền Rayleigh không hoàn hảo. Đầu tiên, tác giả khảo sát ảnh hưởng của các thông số hoạt động quan trọng như công suất phát cực đại, công suất can nhiễu ngưỡng, dung lượng bảo mật cho trước đến xác suất dừng bảo mật (SOP - Secrecy Outage Probability) của hệ thống. Tiếp theo, tác giả khảo sát ảnh hưởng của khoảng cách giữa các nút trong mạng đến SOP của hệ thống. Sau cùng, tác giả dựa vào các kết quả khảo sát để đánh giá bảo mật lớp vật lý (PLS - Physical Layer Security) của hệ thống. Các kết quả cho thấy công suất phát cực đại hoặc công suất can nhiễu ngưỡng tăng sẽ cải thiện khả năng bảo mật lớp vật lý
thông tin kênh truyền không hoàn hảo tăng có ảnh hưởng tiêu cực đến hiệu năng PLS
dung lượng bảo mật cho trước tăng làm giảm khả năng bảo mật lớp. Ngoài ra, các kết quả khảo sát còn cho thấy khoảng cách giữa máy thu thứ cấp và máy phát thứ cấp có ảnh hưởng đáng kể đến hiệu năng PLS, khoảng cách này càng lớn thì hiệu năng PLS càng thấp. Hơn nữa, các kết quả còn cho thấy UCRN khó đạt được hiệu năng PLS tốt vì SOP có các giá trị khá cao, đặc biệt khi khoảng cách giữa máy thu thứ cấp và máy phát sơ cấp nhỏ hoặc khi khoảng cách giữa máy thu và máy phát thứ cấp lớn hệ thống hầu như không thể đạt được bảo mật.This article investigates and evaluates the physical layer security (PLS) performance of an Underlay Cognitive Radio Network (UCRN) with imperfect Rayleigh fading channel information. First, the author examines the impact of important operational parameters such as maximum transmit power, interference power threshold, and predetermined security capacity on the system's secrecy outage probability (SOP). Next, the author studies the influence of the distance between network nodes on the SOP. Finally, the author utilizes the survey results to assess the PLS of the system. The findings indicate that increasing the maximum transmit power or the interference power threshold improves the physical layer security capability. However, imperfect channel information negatively affects the PLS performance. Moreover, increasing the predetermined security capacity reduces the PLS capability. Additionally, the survey results reveal that the distance between the secondary receiver and the primary transmitter significantly impacts the PLS performance, with a larger distance leading to lower PLS performance. Furthermore, the results demonstrate that achieving good PLS performance in UCRN is challenging due to relatively high SOP values, especially when the distance between the secondary receiver and the primary transmitter is small or when the distance between the secondary transmitter and the primary receiver is large, making it nearly impossible to achieve security.

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