单载波频域均衡与多载波OFDM误码性能的理论比较
Theoretical Comparison of BER Performance between Single-Carrier Frequency-Domain Equalization and Multi-carrier OFDM
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摘要: 单载波频域均衡(SC-FDE)和多载波正交频分复用(OFDM)是数字通信中用于克服多径衰落的两种技术。本文通过理论推导对这两种技术在高斯白噪声通信信道巾的误码性能进行了比较。利用高斯分布尾部概率的数值变化特性,本文推导出如下结论:在低信噪比条件下,OFDM的误码性能略优于SC-FDE,而在高信噪比条件下,SC-FDE则能取得显著优于OFDM的误码性能。这一结论对于通信系统的设计具有重要的参考价值。
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关键词:
- 单载波频域均衡; OFDM; 误码性能
Abstract: Single-Carrier Frequency-Domain Equalization (SC-FDE) and multi-carrier Orthogonal Frequency Division Multiplexing (OFDM) are two techniques to combat multipath fading in digital communications. This paper compares the BER performances of them for white Gaussian noise channel theoretically. By the value-changing property of Gaussian distributions tail probability, the following conclusion is drawn: OFDM is a little better than SC-FDE in BER performance for Sow Signal-to-Noise Ratio (SNR), while SC-FDE greatly outperforms OFDM for high SNR. This conclusion is significant to the design of the communication system for its important reference value. -
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