| Summary: | 碩士 === 國立中山大學 === 通訊工程研究所 === 94 === Two novel structures of training symbols are proposed for both timing offset and frequency offset estimations in orthogonal frequency division multiplexing (OFDM) systems.
The first proposed training symbol has repeated sample blocks and a sign pattern on each block. With the proposed structure, system synchronization can be obtained with relatively low complexity. In particular, the frequency synchronization is accomplished using two successive stages to obtain both the fractional and integral parts of frequency offset with an estimation range of sub-carrier spacing. Simulation experiments demonstrate that the performance of the proposed scheme is substantially superior to the traditional schemes, or has negligible difference.
The second proposed training symbol has the form of repeat and conjugate symmetric blocks and a sign pattern on each block. Then, a weighted timing metric is proposed to estimate the timing offset. Simulation results demonstrate that the proposed timing metric substantially improves the traditional schemes.
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