Những ứng dụng về truyền thông không dây thời gian thực đòi hỏi những yêu cầu về thời gian đáp ứng rất khắt khe. Nhất là những ứng dụng về thoại, truyền hình trực tiếp và những dữ liệu có kích thước lớn. Một trong những thử thách của hệ
thống này là yêu cầu kích thước khung truyền không được quá lớn, vì điều đó sẽ ảnh hưởng trực tiếp đến độ tin cậy của dữ liệu và thời gian đáp ứng. Nhưng nếu kích thước khung nhỏ, đồng nghĩa với việc giới hạn kích thước của bộ chèn, lại ảnh hưởng đến chất lượng giải mã của mã chống lỗi Turbo. Tùy dạng dữ liệu truyền mà hệ thống sẽ cần một bộ chèn bit thích hợp. Chính vì vậy, nghiên cứu tối ưu bộ chèn là hướng phát triển của đề tài.
Để tận dụng tối ưu lợi thế của mã Turbo trong hệ thống đa ăng-ten MIMO. Các nghiên cứu gần đây thường ứng dụng OFDM vào hệ thống MIMO để tận dụng
được dung lượng kênh truyền nhằm giảm tối đa ảnh hưởng fading chọn lọc tần số. Ứng dụng Turbo-MIMO vào chuẩn CDMA2000 đang là tâm điểm của nhiều kế
hoạch nghiên cứu với qui mô lớn.
Về mặt kỹ thuật, hệ thống MIMO-OFDM sẽ là nền tảng cho mạng di động 3G và 802.16 (WiMax). Ứng dụng thiết kế mã chống lỗi Turbo một cách tối ưu để
CBHD:TS Hoàng Thu Hà 124 HVTH: Nguyễn Quang Anh
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