| 直扩超宽带系统在室内密集多径下的多址性能 |
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| 引用本文： | 樊祥宁,倪剑强,毕光国.直扩超宽带系统在室内密集多径下的多址性能[J].东南大学学报,2005,21(4):393-397. |
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| 作者姓名： | 樊祥宁 倪剑强 毕光国 |
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| 作者单位： | 东南大学移动通信国家重点实验室,南京210096 |
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| 摘 要： | 分析了脉冲方式直扩二相相移键控超宽带无线通信系统在室内多用户和密集多径环境下用户码对系统性能的影响,推导了采用Rake接收时系统的输出信号,并为直扩超宽带系统提供了一种简单而切实可行的用户码方案,即:在大的脉冲波形占空比的条件下,直接选用码长足够长的、具有良好的互相关正交特性的随机或伪随机用户码即能使脉冲方式直扩超宽带无线系统获得接近最佳的性能,从而不必精心设计和选择用户码.仿真了Rake接收时CM1～CM4多径信道下采用Gold序列与随机二进制PN序列作为用户码时的多用户性能,验证了提出的用户码方案的可行性.
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| 关 键 词： | 超宽带 多用户 多径 Gold码 直接序列 |
| 收稿时间： | 03 1 2005 12:00AM |
Multi-access performance of DS UWB system under indoor dense multi-path channel |
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| Fan Xiangning,Ni Jianqiang,Bi Guangguo.Multi-access performance of DS UWB system under indoor dense multi-path channel[J].Journal of Southeast University(English Edition),2005,21(4):393-397. |
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| Authors: | Fan Xiangning Ni Jianqiang Bi Guangguo |
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| Institution: | National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China |
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| Abstract: | The performance of multi-user code to direct spreading bi-phase shift keying (DS-BPSK) direct impulse ultra wideband (UWB) systems under indoor multi-user and multi-path environment is analyzed and simulated.The system output signals with Rake receiver are derived,then a simple and practical code selection scheme is given; i.e.,with a large occupation to empty ratio of the repeating pulses,directly choosing those random or pseudo-random user codes with enough length and good co-relative orthogonal features will make the performance of DS-BPSK approximate the optimum and, so there is no need to carefully design the code or its type.The system multi-access performances are simulated using Gold sequence and PN codes as multi-user codes under CM1-CM4 multi-path channels.Simulation results prove that the proposed scheme is feasible. |
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| Keywords: | Rake ultra wideband multi-access multi-path Gold code direct sequence Rake |
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