OFDM系統(tǒng)中基于符號間相位差分調(diào)制的頻偏估計模糊度校正算法
Frequency Ambiguity Resolution Algorithm for OFDM Systems Based on Phase Differential Modulation between Adjacent Symbols
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摘要: OFDM系統(tǒng)的性能對頻率偏移非常敏感。該文針對OFDM系統(tǒng)頻偏估計中所產(chǎn)生的模糊度問題提出了一種基于符號間相位差分調(diào)制的頻偏估計模糊度校正算法。它通過在相鄰OFDM符號中相同子載波間進行相位差分調(diào)制來校正頻偏估計模糊度。文中從理論上給出并證明了算法具有唯 可辨識性的充分條件,并分析比較了算法的復雜度和定時誤差對算法性能的影響。理論分析和仿真結(jié)果表明,在性能相近的前提下,該文提出的頻偏估計模糊度校正算法具有運算量小和對定時誤差不敏感的優(yōu)點。
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關(guān)鍵詞:
- OFDM; 相位差分調(diào)制; 頻偏估計模糊度校正
Abstract: OFDM systems are sensitive to the frequency offset. In this paper, a novel frequency ambiguity resolution algorithm in OFDM systems based on phase differential modulation between adjacent symbols is proposed to correct the frequency ambiguity. The sufficient condition for the proposed algorithm to achieve unique identifiability is deduced. Moreover, the computational complexity of the proposed algorithm and the sensitivity of the proposed algorithm to the timing error are also analyzed in the paper. Theoretical analysis and computer simulations show that the proposed algorithm has the low complexity advantage over conventional algorithm while maintaining approximately the same performance. -
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