OFDM系統(tǒng)中的全數(shù)字頻偏跟蹤環(huán)
All Digital Frequency Offset Tracking Loop in OFDM Systems
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摘要: 頻偏跟蹤是影響到OFDM系統(tǒng)性能的關(guān)鍵技術(shù)之一。該文基于遲早門類型的鎖相環(huán)，提出了一種新的適合于OFDM系統(tǒng)的頻偏跟蹤算法。研究表明，該算法既能在AWGN信道中也能在多徑衰落信道中完成頻偏跟蹤工作。并且其低信噪比下的頻偏跟蹤性能比一般的頻偏跟蹤方法好幾個數(shù)量級。如果系統(tǒng)對定時估計的要求不是特別高，該算法還能實現(xiàn)定時偏移和頻率偏移的聯(lián)合跟蹤。
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關(guān)鍵詞:
- 正交頻分復(fù)用; 頻偏跟蹤; 定時跟蹤; 鎖相環(huán)
Abstract: Frequency offset tracking is one of the key technologies that affect OFDM systems performance. Based on early-late gate phase-locked loop, a new frequency offset tracking algorithm is proposed in this paper. The study shows that the algorithm can complete frequency offset tracking in AWGN channel and multipath fading channel. Furthermore under lower SNR the performance of the proposed algorithm is better by several orders compared to the common frequency offset tracking methods. If the systems have not very special requirements on timing tracking this algorithm also can complete joint tracking of frequency and timing. -
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