摘要(英) |
OFDM is a nucleus system of DVB-T. This system successfully eliminated the ISI effect and multi-path interference by using multi-carriers and inserting cyclic-prefix. In high-mobility environment, DVB-T signals pass the time-varying channel, and a loss of sub-carrier orthogonality due to Doppler spread of received signals leads to inter-carrier interference (ICI).This ICI effect degrades the maximum allowed velocity of reception. For eliminating this ICI effect due to high-mobility reception, this thesis modifies other’s methods and introduces a method about channel estimation and equalization, which is suitable high-mobility reception.
This thesis refers to the DVB-T standard, and further makes it suitability for high mobility environment. By using ICI cancellation, and comparing three different scheme (Traditional, iterative ICI cancellation, and Taylor series-like) for channel and ICI estimation. In addition, we aim at low SIR ratio part which is influenced by ICI to add ML detection, which can improve the performance and reduce bit error rate.
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參考文獻 |
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