两跳OFDM-AF接力系统中的子载波配对技术

分析了基于放大前传的两跳正交频分复用接力系统.针对因信号在两跳过程中被置于相同子载波传输而限制系统性能的问题，提出了子载波配对技术，并采用匈牙利算法提出了最优配对方案.进一步提出了基于子带的子载波配对方案.仿真结果表明，子载波配对技术能为系统带来约5dB的增益；基于子带的子载波配对的增益略低，但能大大降低信令开销.

Sub-Carrier Coupling for Two Hop OFDM-AF Relaying Systems

An amplify-and-forward (AF) based two-hop orthogonal frequency division multiplexing (OFDM) relaying system was analyzed. Since channel fading of the first hop and second hop is independent, system performance is limited if the signal is transmitted on the same sub-carrier in both hops. In order to solve the problem, a sub-carrier coupling method was proposed. A Hungarian algorithm was adopted to provide the optimal coupling scheme, and furthermore, sub-carrier coupling scheme based on sub-bands was presented. Simulations indicate that sub-carrier coupling can bring about 5 dB gain to the system. Though the gain of sub-carrier coupling scheme based on sub-bands only has a little loss, it can reduce signaling overhead greatly.