关键词: 通信技术, 协作分集, 放大前传, OFDM系统, 子载波选择

Abstract:

A cooperative relaying scheme using OFDM modulation is studied and a subcarrier selection in cooperative OFDM system is proposed.To maximize the system capacity,subcarriers based on the channel information are chosen to improve the capacity of the system by using the relay station to amplify-and-forward the signal.Result shows that in lower relay/resource power ratio or in the circumstance that the relay is in the middle of the resource and destination station,using all subcarriers to relay would decrease the capacity.The subcarrier selection can improve the capacity.Suitable relay/resource power ratio and relay position would significantly improve the capacity of the system.When the relay station is in the middle of the resource and destination station,the capacity is maximized.

Key words: communication;cooperative;diversity;amplify-and-forward;OFDM;system;subcarrier selection