Discrete Cosine Transform (DCT) can be used instead of conventional Discrete Fourier Transform (DFT) for the Orthogonal Frequency Division Multiplexing (OFDM) construction, which offers many advantages. In this paper, the Multiple-Input-Multiple-Output (MIMO) DCT-OFDM is enhanced using a proposed Cosine Domain Equalizer (CDE) instead of a Frequency Domain Equalizer (FDE). The results are evaluated through the Rayleigh fading channel with Co-Carrier Frequency Offset (Co-CFO) of different MIMO configurations. The average bit error probability and the simulated time of the proposed scheme and the conventional one is compared, which indicates the importance of the proposed scheme. Also, a closed formula for the number of arithmetic operations of the proposed equalizer is developed. The proposed equalizer gives a simulation time reduction of about 81.21%, 83.74% compared to that of the conventional LZF-FDE, and LMMSE-FDE, respectively for the case of 4x4 configuration.

翻译：离散余弦变换（DCT）可替代传统离散傅里叶变换（DFT）用于正交频分复用（OFDM）系统构建，具有诸多优势。本文通过提出余弦域均衡器（CDE）替代频域均衡器（FDE），对多输入多输出（MIMO）DCT-OFDM系统进行增强。基于不同MIMO配置下的瑞利衰落信道与共载波频偏（Co-CFO）条件评估性能，对比了所提方案与传统方案的平均误码概率和仿真时间，验证了所提方案的重要性。同时推导了所提均衡器算术运算次数的闭式表达式。在4×4配置下，与传统LZF-FDE和LMMSE-FDE相比，所提均衡器分别实现约81.21%和83.74%的仿真时间缩减。