多径衰落信道条件下OFDM系统性能研究

Performance analysis of OFDM system in multi-path fading channels

讨论了正交频分复用系统模型在不同条件下,如加窗和防护段、脉冲整形等,对多径衰落信道条件下正交频分复用系统误码率(BER)性能进行分析。仿真结果表明,加防护段以后系统的BER性能得到改善,但经脉冲整形后,由于载波间的正交性被破坏,因此系统性能几乎没有提高。

The mechanism and models of the orthogonal frequency division multiplexing(OFDM) system are discussed in detail. The performance BER (bit error rate) of the OFDM system in the multipath fading channels is analyzed under various conditions such as guard, window and pulse shaping. The simulation results show that the system performance is improved by inserting a guard interval between the symbols and no improvement can be made duet to the orthogonality damage between the OFDM carriers after the pulse shaping.