| 基于无碰撞区跳频序列的两级FFH/MFSK系统 |
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| 引用本文： | 叶文霞,范平志,郝莉. 基于无碰撞区跳频序列的两级FFH/MFSK系统[J]. 西南交通大学学报, 2010, 45(2). DOI: 10.3969/j.issn.0258-2724.2010.02.018 |
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| 作者姓名： | 叶文霞 范平志 郝莉 |
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| 作者单位： | 西南交通大学信息编码与传输省重点实验室,四川成都,610031 |
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| 基金项目： | 国家自然科学基金，国家高技术研究发展计划(863计划) |
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| 摘 要： | 为提高系统容量,提出了一种基于无碰撞区(NHZ)跳频序列的两级FFH/MFSK系统(称为NHZ/FFH系统).系统中全体用户被分成若干组,每组分配一个互不相同的NHZ跳频序列.由于NHZ跳频序列的汉明互相关在NHZ内等于0,只要用户间相对延迟不超过无碰撞区,就可以消除组间用户的干扰,多址干扰只来源于同一组内的用户.通过采用适于异步系统的多用户检测器,可以进一步提高系统的检测性能,且多用户检测器的规模和复杂度只与组内用户数有关.结合系统模型进行了干扰分析和仿真研究,结果表明,与现有MS/FFH系统相比,在相同的信道条件下,对于相同的误码率级别,NHZ/FFH系统支持的用户数多.
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| 关 键 词： | FFH/MFSK系统 无碰撞区跳频序列 多用户检测 |
Two-Stage FFH/MFSK System Based on Frequency Hopping Sequence with No-Hit Zone |
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| YE Wenxia,FAN Pingzhi,HAO Li. Two-Stage FFH/MFSK System Based on Frequency Hopping Sequence with No-Hit Zone[J]. Journal of Southwest Jiaotong University, 2010, 45(2). DOI: 10.3969/j.issn.0258-2724.2010.02.018 |
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| Authors: | YE Wenxia FAN Pingzhi HAO Li |
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| Affiliation: | YE Wenxia,FAN Pingzhi,HAO Li(Key Lab of Information Coding & Transmission,Southwest Jiaotong University,Chengdu 610031,China) |
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| Abstract: | To improve system capacity,a two-stage FFH/MFSK(fast frequency hopping/multilevel frequency-shift-keying) system based on frequency hopping sequence with no-hit zone(NHZ),named as NHZ/FFH system,was proposed.In this system,users are divided into a number of groups,and each group is assigned a unique NHZ FH(frequency hopping) sequence.Because the cross-correlations of NHZ FH sequences are equal to zero within no-hit zone,the multiple-access interference(MAI) between users of different groups can be eliminate... |
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| Keywords: | FFH/MFSK system frequency hopping sequence with no-hit zone muhiuser detection |
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