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中文摘要：
时域脉冲波形设计是超宽带通信系统解决频谱共存和相互干扰问题的设计重点。通过推导了M元TH—PPM方式下超宽带多用户接人系统的信噪比和误码率性能，研究分析了脉冲波形对系统性能的影响，对4种脉冲波形在AwGN信道下使用M元TH—PPM方式对系统信噪比和误码率性能的影响作了比较。结果证明，脉冲波形对多用户接人方式下系统SNR和BER性能影响很大。
英文摘要：
The designing of pulse shape is the key to the spectrum-coexist and interference problem in UWB system. In this paper we first present a BER and multiple access mechanism for M-ray TH-PPM UWB system and then look at the influence of pulse shape on UWB system. We have also made a comparison among four kinds of pulse shapes in AWGN. The results show that the influence of pulse shape on the BER and multiple access mechanism for M-ray TH-PPM UWB system is significant.
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