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Study on the Performance of Bluetooth Data Transmission Based on Error Control

Author: LiChangJiang
Tutor: QianZhiHong
School: Jilin University
Course: Communication and Information System
Keywords: Bluetooth Extended Golay coding MSK modulation Automatic repeat request
CLC: TN925
Type: Master's thesis
Year: 2011
Downloads: 47
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Abstract

Bluetooth technology as an open global specification for a short-range wireless voice and data communications, can achieve the convenient wireless communication between devices, and Bluetooth technology, low cost, small size, the band is free, and simple networking. Bluetooth technology is now widely used in the field of wireless communications, including voice communications, data transmission, Internet access, and smart home. Although the application of Bluetooth technology has been very extensive, but not on behalf of itself perfect, there are still a lot of room for improvement. The Bluetooth technology goal is the beginning of the proposed globally, inexpensive, and compact structure, on so many levels its own use is not the most advanced technology, resulting in the practical application of the process, there are some insurmountable problems. Using the error control mechanism such as the Bluetooth protocol which has a code rate of 1/3 forward error correction code, the code rate of 2/3 FEC and ARQ mechanism, in the case of poor channel quality, interference performance often difficult to meet the actual needs of the application. As a user, you always want to use the product has a high technical level, and has a perfect performance. Bluetooth devices when transmitting data, the data from the upper application, mainly through the Bluetooth logical link control and adaptation layer (L2CAP), HCI layer, the base band layer and the RF layer interacts successfully to complete the data. In order to ensure that the data transmission performance in the transmission process, the protocol on L2CAP baseband layer are increased error control mechanism, in order to ensure reliable transmission of data. The paper in-depth study of the process of Bluetooth data transmission, specific analysis of the problems, and then targeted improvements, and ultimately the improved performance of the Bluetooth data transmission. The innovation of the article consists principally of two ways: 1. Baseband layer grouping exists for 2.0 EDR Bluetooth protocol DH improvements proposed by the extended Golay coding combined with MSK modulation error control mechanism, improved DH packet in the case of a lower signal to noise ratio can be maintained higher throughput, and to improve the anti-interference performance of the data packet. L2CAP layer retransmission mechanisms exist mainly for the layer throughput low SR ST hybrid ARQ mechanism to improve the L2CAP layer retransmission mechanisms, come retransmission improved by simulation analysis mechanism to improve the throughput of data transmission, and the required buffer space is limited, the data overflow does not occur. The article is divided into six chapters, the chapter is organized as follows: Chapter 1, Introduction, introduces the Bluetooth technology and its applications and prospects for development, and system analysis for Research and Existing Bluetooth data error control mechanism, Finally, the article studies the content and structure of arrangements. Chapter 2 Bluetooth protocol analysis, introduces the Bluetooth protocol architecture, including the protocol specification and the practical application of the framework, and then from the RF protocol, the core agreement as well as the non-core agreement on the Bluetooth protocol analysis of the system. Chapter 3 Bluetooth data error control mechanism, the first details of the error control techniques, including the realization of the principle and the basic form, and then introduced the use of error correction coding error control, and for which several detailed analysis Finally, from the Bluetooth baseband layer and the LLC and adaptation layer (L2CAP) analyzed the Bluetooth data error control mechanism forms of the problems, which laid the foundation for later study. Chapter 4 Bluetooth baseband layer error control improved algorithm, the first analysis of the problems in the packet transmission performance of Bluetooth baseband layer DH, followed by detailed analysis of the using extended Golay coding DH packet of the packet transmission performance as well as using MSK modulation packet of misuse rate, in this basis based on the extended Golay coded MSK modulation Bluetooth data error control improved method through simulation analysis drawn improved Bluetooth DH grouping, has strong anti-jamming performance in signal-to-noise still able to maintain a high throughput in the case of a relatively low. Chapter 5 Bluetooth L2CAP layer error control improved algorithm, first proposed the existence of the problem of the Bluetooth L2CAP layer retransmission mechanism, followed by analysis of the advantages and disadvantages of the traditional ARQ mechanism, and on this basis SR ST hybrid ARQ mechanism to to improve the throughput of the Bluetooth L2CAP layer data transmission, improved retransmission mechanism through on simulation analysis can take advantage of the limited buffer space to achieve efficient data retransmission. Chapter 6 Full Summary and Outlook. A summary of the full text, and pointed out that the Bluetooth data transmission needs further study the content as well as the issues to be resolved.

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