一种卫星信道下高效QOTDM传输方法

发布时间：2018-02-28 02:24

本文关键词： 准正交时分复用正交频分复用多速率变换频域均衡　出处：《西安电子科技大学学报》2017年01期 　论文类型：期刊论文

【摘要】：针对卫星移动信道的传输特性,提出了一种高效的准正交时分复用传输方式.在发送端,该传输方式采用高阶幅度相移键控调制,并进行多速率变换来消除样点交织后的频谱间隙,从而提高系统频谱效率;在接收端,构造循环卷积,并给出一种分块频域均衡算法.该均衡算法利用多径能量来抑制噪声干扰,同时也会消除匹配滤波时的样点间干扰.与传统的频域均衡算法相比,该均衡算法可以提高系统频谱利用率和数据传输效率.仿真结果表明:当误比特率为10-3时,与正交频分复用系统相比,该传输方式在时变莱斯衰落信道条件下可获得5dB左右的信噪比增益,且具有较强的抗多径衰落能力.
[Abstract]:According to the transmission characteristics of satellite mobile channel, an efficient quasi-orthogonal time division multiplexing (QTDM) transmission mode is proposed, which uses high-order amplitude phase-shift keying modulation at the transmitter. In order to improve the spectral efficiency of the system, multi-rate transformation is carried out to eliminate the spectral gap after the interleaving of the sample points, and the cyclic convolution is constructed at the receiving end. A block frequency domain equalization algorithm is presented, which uses multipath energy to suppress noise interference and eliminate the interference between samples in matched filtering. Compared with the traditional frequency domain equalization algorithm, the proposed equalization algorithm is more efficient than the traditional frequency domain equalization algorithm. The proposed equalization algorithm can improve the spectral efficiency and data transmission efficiency of the system. The simulation results show that when the bit error rate is 10 ~ (-3), compared with the orthogonal frequency division multiplexing system, the proposed equalization algorithm is more efficient than the orthogonal frequency division multiplexing system. Under the condition of time-varying Rice fading channel, the SNR gain of this transmission mode is about 5 dB, and it has strong anti-multipath fading ability.
【作者单位】：西安电子科技大学综合业务网理论及关键技术国家重点实验室;西安电子科技大学信息感知技术协同创新中心;
【基金】：国家自然科学基金资助项目(61571340) 现代无线信息网络基础理论与技术“111”创新引智基地资助项目(B08038)
【分类号】：TN927.2

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