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针对Ku频段甚小口径天线终端(VSAT)多点回传应用中面临的频谱利用效率和功率谱密度约束的矛盾,提出一种混叠频分/码分多址(O-FCDMA)系统框架。每个用户采用不同的序列扩频并分别调制到存在频谱混叠的不同子载波上,在保持较低接收机复杂度的同时提高频谱利用效率。仿真表明:部分混叠的O-FCDMA方案可以有效降低多用户干扰(MAI),其性能接近最优的基于置信传播(BP)多用户联合迭代检测译码的直接扩频码分多址(DS-CDMA)系统的,并优于混合频分/码分多址(H-FCDMA)系统的,逼近单用户无干扰时的性能,而且对传统基于匹配滤波的DS-CDMA系统具有更好的兼容性,更易于工程实现。
Aiming at the contradiction between spectral efficiency and power spectral density constraint in Ku-band VSAT multi-point backhaul applications, an Orthogonal Frequency Division Multiplexing / Code Division Multiple Access (O-FCDMA) system framework is proposed. Each user uses different sequences to spread spectrum and separately modulates to different sub-carriers with spectrum aliasing, so as to improve spectrum utilization efficiency while maintaining low receiver complexity. The simulation results show that the partially aliased O-FCDMA scheme can effectively reduce the interference of multi-user interference (MAI), and its performance is close to optimal. Based on belief propagation (BP) multi-user joint iterative detection and decoding of direct spreading code division multiple access -CDMA) system and outperforms the performance of single-user interference-free systems based on Hybrid-FCDMA (H-FCDMA) systems and is more compatible with traditional matched filter based DS-CDMA systems Sexual, easier to implement.