| Summary: | 碩士 === 國立成功大學 === 電腦與通信工程研究所 === 95 === Single carrier frequency-domain equalization technique (SC-FDE) with space-time block coding (STBC) can be applied to suppress inter-symbol interference (ISI) which is caused by multipath effect, avoiding complex time-domain equalization in the receiver and making transmitted signal obtain additional diversity gain.
In this thesis, we further apply SC-FDE with STBC technique to DS-CDMA system which is suitable for asynchronous users and derive a frequency-domain minimum mean-square error (MMSE) equalization for the system to both equalize and despread the received signal. Then, the least-square fitting (LSF) approach is also considered in the mentioned two systems to estimate practical channel response. To improve the performance of SC-FDE with STBC system, we adopt iterative turbo equalization at the receiver. Here, the turbo equalization which is derived for STBC transmission consists of a frequency-domain approximate MMSE equalizer and a channel decoder. Finally, the simulation results show that the performance of the derived system is increasingly improved by iterations in severe ISI effect.
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