连续可变速率直接序列扩频关键技术研究与验证
发布时间：2018-07-17 22:11
【摘要】：随着信息的快速传递,人们对通信功能提出了更多需求,然而现有的频带资源越来越稀缺,为了满足多种速率的数据传输,可变速率扩频通信技术就成为了近年来无线通信的研究热点之一。论文主要研究了连续可变速率直扩通信中的关键技术,提出了基于逐符号处理的分数倍扩频方案,验证了矩辅助干扰抑制技术对常见窄带干扰信号的抑制能力,最后在uSDR软件无线电平台上进行了性能测试,主要工作如下:第一,分数倍扩频方案设计。首先调研了已有的两种可变速率扩频方案,对多码正交扩频方案和可变处理增益正交扩频方案进行了对比,提出了逐符号处理的分数倍扩频技术,在信道带宽保持不变的前提下,实现了信息速率的连续变化。第二,矩辅助干扰抑制技术。通过对直扩系统中常见的窄带干扰类型和干扰抑制方法调研,提出了复杂度低、干扰抑制能力强的矩辅助干扰抑制技术。验证了系统对单音干扰、数字调制干扰、高斯带通干扰信号的抑制能力。第三,链路总体设计。根据功能与性能需求,对通信链路进行了总体设计,给出了关键模块的详细设计方案。主要包括扩频技术、数字中频技术、矩辅助干扰抑制技术以及同步跟踪技术。在Simulink上搭建全链路仿真模型,测试了系统在不同干扰类型,干信比为45dB和40dB下的干扰抑制能力。仿真结果表明,在信息速率为10Kbps,在干信比为45dB时,相比于无干扰场景,性能损失低于2dB。在干信比为40dB时,相比于无干扰场景,性能损失低于1.8dB。第四,在图形化开发工具System Generator上完成了链路的整体实现。采用FPGA自顶而下的原则,对发射端和接送端每一模块实现过程进行了详细介绍。在uSDR平台上进行了同步测试和误码率测试,实测结果比无干扰性能损失大约3dB,说明整体实现方案是合理与可行的。本文提出的逐符号处理的扩频方案具有较强的实用性,并且解决了传统扩频通信技术仅仅局限于整数倍扩频增益的问题,为后续直扩通信的研究提供了参考。
[Abstract]:With the rapid transmission of information, people put forward more requirements for the communication function. However, the existing frequency band resources are becoming more and more scarce, in order to meet the needs of multi-rate data transmission, Variable rate spread spectrum communication technology has become one of the hotspots of wireless communication in recent years. In this paper, the key technologies of continuous variable rate direct spread spectrum communication are studied, and a fractional multiple spread spectrum scheme based on symbol processing is proposed, which verifies the ability of moment assisted interference suppression technology to suppress common narrowband interference signals. Finally, the performance test is carried out on uSDR software radio platform. The main work is as follows: first, the design of fractional multiple spread spectrum scheme. First of all, two kinds of variable rate spread spectrum schemes are investigated, and the multi-code orthogonal spread spectrum scheme and the variable processing gain orthogonal spread spectrum scheme are compared, and a symbol-by-symbol fractional doubling spread spectrum technique is proposed. The continuous change of the information rate is realized on the premise that the channel bandwidth remains unchanged. Second, moment-assisted interference suppression technology. Based on the investigation of common narrowband interference types and interference suppression methods in DSSS systems, a moment assisted interference suppression technique with low complexity and strong interference suppression ability is proposed. The ability of the system to suppress single tone interference, digital modulation interference and Gao Si bandpass interference is verified. Third, the overall design of the link. According to the requirement of function and performance, the overall design of communication link is carried out, and the detailed design scheme of key module is given. It mainly includes spread spectrum technology, digital intermediate frequency technology, moment-assisted interference suppression technology and synchronous tracking technology. The full-link simulation model is built on Simulink, and the interference suppression ability of the system is tested under different interference types and dry signal ratio of 45dB and 40dB. The simulation results show that the performance loss is less than 2 dB when the information rate is 10 kbpsand the dry signal ratio is 45 dB. When the dry signal ratio is 40 dB, the performance loss is less than 1.8 dB compared to the non-interference scenario. Fourth, the overall implementation of the link is completed on the graphical development tool system Generator. Based on the principle of top-down FPGA, the implementation process of each module in transmitter and receiver is introduced in detail. Synchronization test and bit error rate test are carried out on the uSDR platform. The measured results show that the performance loss is about 3 dB compared with that of no interference, which shows that the overall implementation scheme is reasonable and feasible. The symbol-by-symbol spread spectrum scheme proposed in this paper has strong practicability, and solves the problem that the traditional spread spectrum communication technology is only limited to integer multiple spread spectrum gain, which provides a reference for the further study of direct spread spectrum communication.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN914.42
本文编号：2131084
[Abstract]:With the rapid transmission of information, people put forward more requirements for the communication function. However, the existing frequency band resources are becoming more and more scarce, in order to meet the needs of multi-rate data transmission, Variable rate spread spectrum communication technology has become one of the hotspots of wireless communication in recent years. In this paper, the key technologies of continuous variable rate direct spread spectrum communication are studied, and a fractional multiple spread spectrum scheme based on symbol processing is proposed, which verifies the ability of moment assisted interference suppression technology to suppress common narrowband interference signals. Finally, the performance test is carried out on uSDR software radio platform. The main work is as follows: first, the design of fractional multiple spread spectrum scheme. First of all, two kinds of variable rate spread spectrum schemes are investigated, and the multi-code orthogonal spread spectrum scheme and the variable processing gain orthogonal spread spectrum scheme are compared, and a symbol-by-symbol fractional doubling spread spectrum technique is proposed. The continuous change of the information rate is realized on the premise that the channel bandwidth remains unchanged. Second, moment-assisted interference suppression technology. Based on the investigation of common narrowband interference types and interference suppression methods in DSSS systems, a moment assisted interference suppression technique with low complexity and strong interference suppression ability is proposed. The ability of the system to suppress single tone interference, digital modulation interference and Gao Si bandpass interference is verified. Third, the overall design of the link. According to the requirement of function and performance, the overall design of communication link is carried out, and the detailed design scheme of key module is given. It mainly includes spread spectrum technology, digital intermediate frequency technology, moment-assisted interference suppression technology and synchronous tracking technology. The full-link simulation model is built on Simulink, and the interference suppression ability of the system is tested under different interference types and dry signal ratio of 45dB and 40dB. The simulation results show that the performance loss is less than 2 dB when the information rate is 10 kbpsand the dry signal ratio is 45 dB. When the dry signal ratio is 40 dB, the performance loss is less than 1.8 dB compared to the non-interference scenario. Fourth, the overall implementation of the link is completed on the graphical development tool system Generator. Based on the principle of top-down FPGA, the implementation process of each module in transmitter and receiver is introduced in detail. Synchronization test and bit error rate test are carried out on the uSDR platform. The measured results show that the performance loss is about 3 dB compared with that of no interference, which shows that the overall implementation scheme is reasonable and feasible. The symbol-by-symbol spread spectrum scheme proposed in this paper has strong practicability, and solves the problem that the traditional spread spectrum communication technology is only limited to integer multiple spread spectrum gain, which provides a reference for the further study of direct spread spectrum communication.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN914.42
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