中文摘要：

该文提出了一种空时分组码（STBC）多载波（MC）DS—CDMA（STBC MC—DS—CDMA）系统结构，并通过在STBCMC—DS—CDMA下构造的统一的信号模型，实现了系统上行链路基于子空间的信道盲估计，仿真结果表明了方法行之有效。基于信道估计的结果进一步实现了系统最小均方差（MMSE）多用户检测，使系统的BER性能得到很大提高。

英文摘要：

In this paper, a Space-TimeBlock-Coded MultiCarrier Direct-Sequence Code-Division Multiple-Access （STBC MC-DS-CDMA） system is proposed. By constructing the unified signal model of STBC MC-DS-CDMA system, the subspace-based blind channel estimation is achieved and its efficiency is shown by simulation results. Based on the estimation results, consequently, the Minimum Mean-Squared Error （MMSE） multiuser detection for the STBC MC-DS-CDMA is also realized which improves the system performance significantly.