基于高速跳频技术的宽带WPAN若干关键技术研究
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摘要
个人通信的宽带化是当前无线通信网络研究的重大课题之一,如何充分利用有限的频率资源来提供宽带高速应用具有重要的意义。本学位论文针对这种需求,深入研究了基于高速跳频技术的宽带WPAN若干关键技术,主要内容包括高速跳频-码分多址(FH-CDMA)、多链路并行传输、提高纠错能力的信道编码方法等。
本论文主要围绕提高基于高速跳频技术的WPAN的带宽问题展开,提出一个多路并行传输高速跳频通信系统,依靠多链路并行传输技术来提高传输速率,从而提高系统带宽。多链路并行技术要求多个相同的系统共存,必须考虑抗干扰问题,从而提高系统容量,论文以BCH码为例提出一种全新的简单的查表译码算法,以扩展某些BCH码的纠错能力。这样再采用交织技术,从而可以提高整个系统的抗干扰能力。
论文首先以Bluetooth跳频算法为基础,系统地讨论了它的跳频特性并进行了仿真,在此基础上对Bluetooth系统的自干扰性能进行了重点分析,推导出在满足特定QoS情况下同时工作的Piconet数目的解析式。这些推导和仿真工作为本论文提出的多链路并行传输方案奠定了理论基础。
在前面理论推导的基础上,论文提出了一个多路并行传输高速跳频通信系统的方案,并以Bluetooth技术为例加以实现。给出了该方案的设计思想、系统模型、设备框图和具体实施,重点分析了它的优点和创新之处。文中以文件传输为例,论证了并行传输的路数与系统传输速率和吞吐量间的关系,证明了该方案能够合理解决宽带高速应用与大容量间的矛盾,有效提高频谱利用率。
接着,对所提出的多路并行传输技术中涉及到的并行多链路的调度算法和流量控制算法进行了讨论。在总结现有各种算法的基础上,分析了本文实验系统采用的算法及其性能,并对多路并行传输技术在WPAN环境下的应用进行了阐述。
最后,为了提高多路并行传输高速跳频通信系统的抗干扰能力,论文还对差错控制编码领域做了一些研究,主要围绕提高BCH码的纠错能力展开,提出一种全新的简单的BCH码的译码算法——查表法译码。首先搜索出BCH(n,k,t)码能够纠正的码重为t+1的错误图样,再将这些错误图样与码重小于t+1的错误图样放在一起,根据它们对应的伴随式大小进行排序并存储于硬件设备中,从而进行查表法译码。仿真表明:对于某些BCH码,采用这种译码方法,在相同的码长和信息比特数的条件下,能够比一般的BCH译码方法多纠正1比特错误,而且译码电路相对简单,译码速度快。这种提高纠错能力的译码方法对所有的二进制线性循环码都是适用的。采用BCH码的新译码算法后,再进行交织技术,就可以一定程度上提高宽带WPAN系统的抗干扰能力,从而也可以提高系统容量。
Wideband tendency of personal communications has become one of hot issues in current wireless communication networks. How to provide wideband high-rate applications with limited frequency resource for personal communications has great significances. To satisfy the demand, some key technologies of wideband WPAN based on high-rate frequency hopping technology are studied thoroughly, mainly including FH-CDMA, parallel transferring technology by multiple links, channel coding methods of improving error-correcting capability, and etc.
With improving frequency bands of WPAN based on high-rate frequency-hopping technology as the general objective, a high-rate frequency hopping system with multi-link parallel transferring is presented, whose data rate and system frequency band are both improved by multi-link parallel transferring technology. Because parallel data transfer technology by multiple links requires several same systems co-existing, anti-interference problems have to be considered to improve system capacity. With BCH codes as an example, a novel and simple table-search decoding algorithm is put forward to extend the error-correcting capability of some BCH codes. After that, interleaving technology is applied to BCH codes so that the anti-interference capability of the whole system can be improved.
Firstly, Bluetooth frequency hopping algorithm is implemented and its frequency hopping characteristics are analyzed. On the basis of simulation, Bluetooth’s self-interference characteristic is elaborated on. And then two formulas of numbers of co-existing Piconet under some specific QoS are deduced. The deduction and simulation lay a theoretical foundation for the presented multi-link parallel transferring system.
Secondly, according to the previous theoretical deduction, a high-rate frequency hopping system with multi-link parallel transferring is given and implemented based on Bluetooth systems. The design principle, system model, module diagrams and concrete implementations of the designed system are then demonstrated with the emphasis on its advantages and creativeness. File transfer taken for example, performances of data rate and throughput of the implemented system with Bluetooth are analyzed, and the feasibility of the designed system is proved. Thus the contradiction between frequency resource and wideband high-rate applications can be reasonably settled down.
Thirdly, multi-link scheduling algorithms and flow control algorithms concerned with the presented multi-link parallel transferring technology are studied. After several kinds of current algorithms are summed up, the algorithms used in the implemented system and their performances are analyzed. And to show the meaning of multi-link parallel transferring technology, its applications under WPAN environment are further extended.
Finally, in order to improve anti-interference capability of the high-rate frequencyhopping system with multi-link parallel transferring, error-control coding theory is also researched with improving the error-correcting capability of some BCH codes. A new and simple decoding algorithm for BCH codes is brought forth to improve error-correcting capability of some BCH codes, which is called table-search decoding. All the error patterns with weights equal to t+1 and that BCH (n, k, t) codes can correct are found out with the decoding algorithm. Then these error patterns and those whose weights are less than t+1 are ordered according to their corresponding syndrome values. The ordered error patterns are stored in hardware devices so that decoding can be realized by searching the relation tables. The following results are shown through simulations. To BCH codes, when the code bits and information bits are the same, this decoding method can correct one more error bits than usual decoding methods. And moreover, the decoding circuits are comparatively simpler and the decoding speeds are faster. This decoding method of improving the error-correcting capability is applicable to all binary linear cyclic codes. After this BCH decoding algorithm is applied, interleaving technology is then practiced to improve anti-interference capability of the wideband WPAN system in a degree. And thus the system capacity can also be extended.
本论文主要围绕提高基于高速跳频技术的WPAN的带宽问题展开,提出一个多路并行传输高速跳频通信系统,依靠多链路并行传输技术来提高传输速率,从而提高系统带宽。多链路并行技术要求多个相同的系统共存,必须考虑抗干扰问题,从而提高系统容量,论文以BCH码为例提出一种全新的简单的查表译码算法,以扩展某些BCH码的纠错能力。这样再采用交织技术,从而可以提高整个系统的抗干扰能力。
论文首先以Bluetooth跳频算法为基础,系统地讨论了它的跳频特性并进行了仿真,在此基础上对Bluetooth系统的自干扰性能进行了重点分析,推导出在满足特定QoS情况下同时工作的Piconet数目的解析式。这些推导和仿真工作为本论文提出的多链路并行传输方案奠定了理论基础。
在前面理论推导的基础上,论文提出了一个多路并行传输高速跳频通信系统的方案,并以Bluetooth技术为例加以实现。给出了该方案的设计思想、系统模型、设备框图和具体实施,重点分析了它的优点和创新之处。文中以文件传输为例,论证了并行传输的路数与系统传输速率和吞吐量间的关系,证明了该方案能够合理解决宽带高速应用与大容量间的矛盾,有效提高频谱利用率。
接着,对所提出的多路并行传输技术中涉及到的并行多链路的调度算法和流量控制算法进行了讨论。在总结现有各种算法的基础上,分析了本文实验系统采用的算法及其性能,并对多路并行传输技术在WPAN环境下的应用进行了阐述。
最后,为了提高多路并行传输高速跳频通信系统的抗干扰能力,论文还对差错控制编码领域做了一些研究,主要围绕提高BCH码的纠错能力展开,提出一种全新的简单的BCH码的译码算法——查表法译码。首先搜索出BCH(n,k,t)码能够纠正的码重为t+1的错误图样,再将这些错误图样与码重小于t+1的错误图样放在一起,根据它们对应的伴随式大小进行排序并存储于硬件设备中,从而进行查表法译码。仿真表明:对于某些BCH码,采用这种译码方法,在相同的码长和信息比特数的条件下,能够比一般的BCH译码方法多纠正1比特错误,而且译码电路相对简单,译码速度快。这种提高纠错能力的译码方法对所有的二进制线性循环码都是适用的。采用BCH码的新译码算法后,再进行交织技术,就可以一定程度上提高宽带WPAN系统的抗干扰能力,从而也可以提高系统容量。
Wideband tendency of personal communications has become one of hot issues in current wireless communication networks. How to provide wideband high-rate applications with limited frequency resource for personal communications has great significances. To satisfy the demand, some key technologies of wideband WPAN based on high-rate frequency hopping technology are studied thoroughly, mainly including FH-CDMA, parallel transferring technology by multiple links, channel coding methods of improving error-correcting capability, and etc.
With improving frequency bands of WPAN based on high-rate frequency-hopping technology as the general objective, a high-rate frequency hopping system with multi-link parallel transferring is presented, whose data rate and system frequency band are both improved by multi-link parallel transferring technology. Because parallel data transfer technology by multiple links requires several same systems co-existing, anti-interference problems have to be considered to improve system capacity. With BCH codes as an example, a novel and simple table-search decoding algorithm is put forward to extend the error-correcting capability of some BCH codes. After that, interleaving technology is applied to BCH codes so that the anti-interference capability of the whole system can be improved.
Firstly, Bluetooth frequency hopping algorithm is implemented and its frequency hopping characteristics are analyzed. On the basis of simulation, Bluetooth’s self-interference characteristic is elaborated on. And then two formulas of numbers of co-existing Piconet under some specific QoS are deduced. The deduction and simulation lay a theoretical foundation for the presented multi-link parallel transferring system.
Secondly, according to the previous theoretical deduction, a high-rate frequency hopping system with multi-link parallel transferring is given and implemented based on Bluetooth systems. The design principle, system model, module diagrams and concrete implementations of the designed system are then demonstrated with the emphasis on its advantages and creativeness. File transfer taken for example, performances of data rate and throughput of the implemented system with Bluetooth are analyzed, and the feasibility of the designed system is proved. Thus the contradiction between frequency resource and wideband high-rate applications can be reasonably settled down.
Thirdly, multi-link scheduling algorithms and flow control algorithms concerned with the presented multi-link parallel transferring technology are studied. After several kinds of current algorithms are summed up, the algorithms used in the implemented system and their performances are analyzed. And to show the meaning of multi-link parallel transferring technology, its applications under WPAN environment are further extended.
Finally, in order to improve anti-interference capability of the high-rate frequencyhopping system with multi-link parallel transferring, error-control coding theory is also researched with improving the error-correcting capability of some BCH codes. A new and simple decoding algorithm for BCH codes is brought forth to improve error-correcting capability of some BCH codes, which is called table-search decoding. All the error patterns with weights equal to t+1 and that BCH (n, k, t) codes can correct are found out with the decoding algorithm. Then these error patterns and those whose weights are less than t+1 are ordered according to their corresponding syndrome values. The ordered error patterns are stored in hardware devices so that decoding can be realized by searching the relation tables. The following results are shown through simulations. To BCH codes, when the code bits and information bits are the same, this decoding method can correct one more error bits than usual decoding methods. And moreover, the decoding circuits are comparatively simpler and the decoding speeds are faster. This decoding method of improving the error-correcting capability is applicable to all binary linear cyclic codes. After this BCH decoding algorithm is applied, interleaving technology is then practiced to improve anti-interference capability of the wideband WPAN system in a degree. And thus the system capacity can also be extended.
引文
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