Joint Estimation for OFDM Timing and Carrier Frequency Offsets Using Transparent Training Sequences
碩士 === 國立中山大學 === 通訊工程研究所 === 94 === In this thesis, a joint symbol timing and carrier frequency offset estimator is proposed for orthogonal frequency division multiplexing (OFDM) systems. The estimator exploits both redundancy in the cyclic prefix and pilot symbols for channel estimation. The propo...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2006
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| Online Access: | http://ndltd.ncl.edu.tw/handle/04742683296468049294 |
| Summary: | 碩士 === 國立中山大學 === 通訊工程研究所 === 94 === In this thesis, a joint symbol timing and carrier frequency offset estimator is proposed for orthogonal frequency division multiplexing (OFDM) systems. The estimator exploits both redundancy in the cyclic prefix and pilot symbols for channel estimation. The proposed scheme includes a transparent sequence that is added to the OFDM symbol in frequency domain. Comparing with conventional methods, the proposed architecture has the advantage of better bandwidth usage since it does not require extra sub-carriers. The PAPR problem can be suppressed due to constant envelope property of the added sequence in time domain. Moreover, the optimal power allocation ratio of the transparent sequence is determined by minimizing the bit error rate of the system using simulation experiments.
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