OFDM系統(tǒng)中基于零子載波檢測的頻偏估計模糊度校正算法
A Novel Frequency Ambiguity Resolution Algorithm in OFDM Systems Based on Null Subcarrier Detection
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摘要: OFDM系統(tǒng)的性能對頻率偏移非常敏感。該文針對頻偏估計中所產(chǎn)生的模糊度問題提出了一種基于零子載波檢測的頻偏估計模糊度校正算法。它利用OFDM符號中不傳輸信息的子載波進(jìn)行頻偏估計模糊度校正。文中分析了定時誤差對算法性能的影響并分析比較了算法的復(fù)雜度。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與傳統(tǒng)的算法相比具有運算量小的優(yōu)點。
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關(guān)鍵詞:
- OFDM; 零子載波檢測; 頻偏估計模糊度校正
Abstract: OFDM systems is sensitive to the frequency offset. In this paper, a novel frequency ambiguity resolution algorithm in OFDM systems based on null subcarrier detection is proposed to correct the frequency ambiguity. It utilizes the subcarriers which transmit no information bit to correct the frequency ambiguity. In the paper, the effect of timing error on the performance of proposed algorithm is analyzed and the computational complexity of the proposed algorithm is compared with that of conventional algorithm. Simulation results show that the proposed algorithm has the low complexity advantage over conventional algorithm while maintain the same performance. -
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