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Các hệ thống truyền thông hợp tác không đồng bộ: Khảo sát về thiết kế tín hiệu
Tóm tắt
Truyền thông hợp tác là một kỹ thuật đầy hứa hẹn cho các hệ thống không dây tốc độ cao trong tương lai. Các hệ thống này có thể được hình thành như các hệ thống đa đầu vào đa đầu ra ảo (MIMO) nơi mà sự đa dạng không gian/hợp tác là một lợi thế chính. Tuy nhiên, khác với các hệ thống MIMO, một trong những thách thức lớn đối với các hệ thống truyền thông hợp tác là việc truyền hợp tác trong các hệ thống hợp tác có thể không được đồng bộ về thời gian hay tần số, vì các tín hiệu được phát đi từ nhiều nút hợp tác ở các vị trí khác nhau. Các thiết kế tín hiệu hiện có cho các hệ thống MIMO đồng địa điểm có thể không thu thập được sự đa dạng hợp tác trong các hệ thống truyền thông hợp tác. Bài báo này đưa ra cái nhìn tổng quan về những nỗ lực nghiên cứu gần đây nhằm chống lại sự bất đồng bộ về thời gian và tần số trong mạng truyền thông hợp tác. Chúng tôi tập trung vào các thiết kế tín hiệu (hoặc mã hóa/mô đun không gian-thời gian) để đạt được sự đa dạng hợp tác tối ưu, và tóm tắt một số kỹ thuật mã hóa không gian-thời gian phân tán và mã hóa không gian-tần số gần đây nhằm chống lại các lỗi về thời gian và độ lệch tần số, trong khi vẫn đạt được sự đa dạng hợp tác tối ưu trong cả mạng hợp tác một chiều và hai chiều.
Từ khóa
#truyền thông hợp tác #hệ thống không dây #MIMO #đa dạng hợp tác #đồng bộ thời gian #đồng bộ tần sốTài liệu tham khảo
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