协作OFDM系统中的子载波选择算法

研究了协作正交频分复用系统的中继方案,提出了OFDM协作分集系统中的子载波选择算法,根据子信道信息,在容量准则下,选择可以提高系统容量的子载波,以放大前传的方式转发源节点信息。仿真结果表明,在中继节点功率与源节点功率较低或中继节点靠近源或目的节点时,所有子载波都采用中继传输可降低系统容量;子载波选择算法可以改善系统容量,并且选择合适的中继节点发射功率和中继位置,可以显著提高系统容量,当中继节点位于源与目的节点中点时,系统容量最大。

Subcarrier Selection in Cooperative OFDM Networks

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.