為達到IMT Advanced所需求的高資料傳輸速率,針對下一代通訊標準,除了應用多重輸入-多重輸出(MIMO)的技術之外,採用佈設小型的中繼站或分散式天線,並藉由天線間的合作傳輸/接收,可達到改進覆蓋率、提升遠端用戶傳輸率、充分獲得空間上的自由度等,可以顯著提升系統容量,並達到相容於舊系統的要求。本文介紹此種具合作功能的多重輸入-多重輸出通訊系統之架構及方法,可從中發覺新的研究方向。
IMT-Advanced requires very high throughput for the next generation communications system. To achieve this requirement, we can deploy small relay stations and/or distributed antennas, and at the same time, exploit the cooperation between the antennas for transmitting/receiving signal to extend the coverage, increase cell-edge throughput, and raise the degrees of freedom of spatial domain. This article introduces the structure and the methods of cooperative multiple-input multiple-output communication system and points out future research directions.