| 基于二次4阶矩切片的DS-CDMA信号盲检测 |
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| 引用本文： | 赵知劲,濮俊杰,尚俊娜,徐春云.基于二次4阶矩切片的DS-CDMA信号盲检测[J].压电与声光,2009,31(4). |
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| 作者姓名： | 赵知劲 濮俊杰 尚俊娜 徐春云 |
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| 作者单位： | 1. 杭州电子科技大学,通信工程学院,浙江,杭州,310018;中国电子科技集团公司第36研究所,通信系统信息控制技术国家级重点实验室,浙江,嘉兴,314033
2. 杭州电子科技大学,通信工程学院,浙江,杭州,310018 |
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| 摘 要： | 直接序列码分多址(DS-CDMA)在现代民用和军用通信系统得到了广泛应用,DS-CDMA信号盲检测已引起研究者的关注.利用4阶矩切片m4x(0,0,τ)能很好地抑制高斯噪声的特点,在改善4阶矩切片估计的基础上,提出一种二次4阶矩切片检测方法,解决了4阶统计量估计误差和计算量大的问题.仿真结果表明,该方法性能优于平方倍频法、二次谱法和倒谱法等,在虚警概率为1%,信噪比为-22 dB时,检测概率可达90%.
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| 关 键 词： | 直接序列码分多址(DS-CDMA)信号 二次4阶矩切片 盲检测 低信噪比 |
A Blind Detection Method of DS-CDMA Signal Based on the Quadratic Fourth-order Moment Chip |
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| ZHAO Zhi-jin,PU Jun-jie,SHANG Jun-na,XU Chun-yun.A Blind Detection Method of DS-CDMA Signal Based on the Quadratic Fourth-order Moment Chip[J].Piezoelectrics & Acoustooptics,2009,31(4). |
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| Authors: | ZHAO Zhi-jin PU Jun-jie SHANG Jun-na XU Chun-yun |
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| Abstract: | DS-CDMA is widely used in the modern civil and military communication systems. Therefore, DS-CDMA signal blind detection has attracted attention of researchers. Using the fourth-order moment chip m4x(0,0,τ) property which is good to suppress the arbitrary Gaussian noise, on the basis of the improvement of the fourth-order moment chip estimation, a detection method of quadratic fourth-order moment chip is proposed in this paper. The proposed method reduced the estimation error and computation complexity. Experimental results show that the detection performance of the method is better than that of the square frequency multiplication method, spectrum-reprocessing method and the cepstrum method. When the false alarm probability is 1%, the detection probability of presented methods reaches above 90% at SNR of -22 dB. |
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| Keywords: | direct sequence-code division multiple access (DS-CDMA) quadratic fourth-order moment chip blind detection lower SNR |
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