一种基于波形集设计的降低异步DS-CDMA系统多址干扰的新方法

发布时间：2018-03-20 19:24

本文选题：异步DS-CDMA　切入点：波形集　出处：《电子与信息学报》2017年07期 　论文类型：期刊论文

【摘要】：已有研究指出,在异步DS-CDMA系统中,每个用户chip码元使用常规7种波形中的双波形(DW)可以有效地降低多址干扰。该文提出一种基于波形集(WS)设计降低多址干扰的新方法。对于任意多的用户,均可以设计出由常规7种波形中2种或者3种波形构成的WS。相对于DW方法,每个用户只需要使用WS中的单一波形就可以进一步提升其输出端的信干噪比(SINR)和误码率(BER)性能。该文不仅给出了新方法中使用不同波形用户接收端的SINR计算公式,同时给出了不同波形用户改进高斯近似(IGA)下的BER。理论推导和实验仿真证实了:IGA与高斯近似(GA)的BER相比,具有与实际仿真曲线更好的重合度;新方法 IGA下BER推导的准确性;基于WS的新方法相对于已有的DW方法可以进一步降低MAI以及提升多用户的SINR和BER性能。
[Abstract]:Studies have pointed out that in asynchronous DS-CDMA systems, In this paper, a new method based on waveform set is proposed to reduce the multiple access interference (mai). For any number of users, a new method is proposed to reduce the mai. WSs, which are composed of two or three of the seven conventional waveforms, can be designed, as opposed to the DW method. The performance of signal to noise ratio (SINR) and bit error rate (BER) of each user can be further improved by using a single waveform in WS. This paper not only gives the SINR calculation formula of the user receiving terminal using different waveforms in the new method, but also improves the performance of SINR and BER. The theoretical derivation and experimental simulation show that the BER of BER with different waveforms has better coincidence with the actual simulation curve, and the accuracy of BER derivation under the new method IGA is better than that of the actual simulation curve. Compared with the existing DW method, the new WS-based method can further reduce the MAI and improve the SINR and BER performance of multi-users.
【作者单位】：哈尔滨工程大学信息与通信工程学院;
【基金】：国家自然科学基金(61271263)~~
【分类号】：TN929.533

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