| 频率选择性时变信道下OFDM DS-CDMA系统上行链路联合检测算法 |
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| 引用本文： | 彭岳星,吴镇扬,王维新,刘陈.频率选择性时变信道下OFDM DS-CDMA系统上行链路联合检测算法[J].东南大学学报(自然科学版),2004,34(3):297-300. |
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| 作者姓名： | 彭岳星 吴镇扬 王维新 刘陈 |
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| 作者单位： | 东南大学无线电工程系,南京,210096;东南大学无线电工程系,南京,210096;东南大学无线电工程系,南京,210096;东南大学无线电工程系,南京,210096 |
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| 基金项目： | 国家高技术研究发展计划 (863计划 )资助项目(2 0 0 1AA12 3 0 15 ) |
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| 摘 要： | 针对频率选择性时变信道下的正交频分复用直接序列码分多址(OFDM DS-CDMA)系统的上行链路，提出一种联合检测算法．它使用改进的部分并行干扰消除算法实现多用户检测，并在导频辅助下估计时变信道．在不同的车载速度下检验本文算法的性能，仿真结果表明：在车速不超过120km／h时，本文算法能有效抑制多址干扰；当车辆速度超过250km／h时，必须对多普勒效应引起的频率偏移进行估计并纠正以消除信道间干扰．
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| 关 键 词： | 正交频分复用 码分多址 多用户检测 部分并行干扰消除 信道估计 |
| 文章编号： | 1001-0505(2004)03-0297-04 |
Joint detection algorithm for uplink of OFDM DS-CDMA systems over frequency- selective time-varying channels |
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| Peng Yuexing Wu Zhenyang Wang Weixin Liu Chen.Joint detection algorithm for uplink of OFDM DS-CDMA systems over frequency- selective time-varying channels[J].Journal of Southeast University(Natural Science Edition),2004,34(3):297-300. |
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| Authors: | Peng Yuexing Wu Zhenyang Wang Weixin Liu Chen |
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| Abstract: | A joint detection algorithm is proposed for the uplink of OFDM DS-CDMA (direct sequence code division multiple access) systems over frequency-selective time-varying (TV) channels. The multi-user detection is realized by the modified partial parallel interference cancellation (PPIC),and estimates TV channels aided by pilots. The proposed algorithm is tested by simulations under different work conditions,and simulation results show that it can effectively compress multiple access interference (MAI) and correctly estimate TV channels when the speed of terminals is below 120 km/h. While the speed is over 250 km/h,the frequency offset caused by Doppler effect must be estimated and corrected to delete inter-carrier interference (ICI). |
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| Keywords: | OFDM CDMA multi-user detection partial parallel interference cancellation channel estimation |
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