上行多址方案性能比较和研究

Performance Comparison and Study of UpLink Multiple Access

在宽带无线通信系统的研究中,存在四种可行的上行多址接入方案,即单载波频分多址(SC-FDMA)、正交频分多址(OFDMA)、分簇单载波频分多址(Clustered SC-FDMA)和多DFT单载波频分复用多址(Nx SC-FDMA)。首先分析了这些多址方案的原理,并综合比较其在立方度量、复杂度和误码率性能三方面的性能。从比较结果来看OFDMA具有最好的误码率性能及最低的复杂度,但是其对应的立方量度值最大;而SC-FDMA的立方量度值最低却具有最大复杂度而且误码率性能也最差;Clustered SC-FDMA和Nx SC-FDMA的性能是对SC-FDMA和OFDMA两种方案的折中设计。

In the research of wideband wireless communication systems,there are four feasible multiple access methods for uplink system.They are SC-FDMA、OFDMA、Clustered SC-FDMA and Nx SC-FDMA.The principles of these methods,and compare their performance through numerical evolutions and simulations are analyzed,including the comparison of cubic metrics,complexity and the block error ratio.The results show that the OFDMA has the best performance of block error rate with the lowest complexity,but the corresponding value of cubic metrics is the maximum.The SC-FDMA has the minimum value of cubic metrics,but with the highest complexity and the worst performance for the bit error rate.The clustered SC-FDMA and the Nx SC-FDMA are the compromise of the OFDMA and the SC-FDMA.