一種新的OFDM系統(tǒng)載波頻率偏移估計(jì)和跟蹤方案
A Novel Carrier Frequency Offset Estimation and Tracking Scheme for OFDM
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摘要: 針對(duì)載波偏移使OFDM系統(tǒng)出現(xiàn)嚴(yán)重的子載波干擾和性能的下降，該文提出一種OFDM頻偏估計(jì)和跟蹤方案，載頻捕獲階段頻偏估計(jì)采用時(shí)域內(nèi)插入等值導(dǎo)頻的方法，載頻跟蹤階段不需要導(dǎo)頻，而是利用循環(huán)前綴來估計(jì)頻率偏移并進(jìn)行校正。仿真結(jié)果證實(shí)，該方案中導(dǎo)頻輔助的頻率偏移估計(jì)和載頻跟蹤不僅估計(jì)范圍大，而且估計(jì)值準(zhǔn)確，頻偏校正后系統(tǒng)的性能能達(dá)到信道理想估計(jì)條件下的誤比特率。
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關(guān)鍵詞:
- OFDM; 頻率偏移; 頻偏估計(jì); 導(dǎo)頻輔助; 載波跟蹤
Abstract: In this paper, a carrier frequency offset estimation and tracking scheme for OFDM is presented. Pilot-Symbol-Aided (PSA) estimation is used to estimate carrier frequency offset in OFDM system, and the carrier frequency tracking applies the cyclic prefix. The simulation results prove the PSA estimation of frequency offset is precise, and the carrier frequency tracking is available. -
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