單載波頻域均衡與多載波OFDM誤碼性能的理論比較
Theoretical Comparison of BER Performance between Single-Carrier Frequency-Domain Equalization and Multi-carrier OFDM
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摘要: 單載波頻域均衡(SC-FDE)和多載波正交頻分復(fù)用(OFDM)是數(shù)字通信中用于克服多徑衰落的兩種技術(shù)。本文通過理論推導(dǎo)對這兩種技術(shù)在高斯白噪聲通信信道巾的誤碼性能進行了比較。利用高斯分布尾部概率的數(shù)值變化特性,本文推導(dǎo)出如下結(jié)論:在低信噪比條件下,OFDM的誤碼性能略優(yōu)于SC-FDE,而在高信噪比條件下,SC-FDE則能取得顯著優(yōu)于OFDM的誤碼性能。這一結(jié)論對于通信系統(tǒng)的設(shè)計具有重要的參考價值。
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關(guān)鍵詞:
- 單載波頻域均衡; OFDM; 誤碼性能
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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