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In present of multi-path effect, the Inter Symbol Interference (ISI) always exists in the OFDM/OQAM system and the preamble based channel estimation for the conventional Orthogonal Frequency Division Multiplex with Cyclic Prefix (CP-OFDM) is not feasible any more. Considering the characteristic of the Extended Gaussian Function (EGF), the authors propose two modified preamble based channel estimation by adding zero-value guard symbols, which are located at both sides (method A) and the left side (method B) of preamble reference symbol. Compared with the CP-OFDM system, the proposed preamble based channel estimation achieves 2dB improvement. Furthermore, they shorten the preamble without zero-value guard symbol to improve the spectrum efficiency.
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