christian louboutin sko The OFDM system IEEE802.11

The IEEE802.11a OFDM Frame Detection System

Double-related low complexity frame detection can be seen from Figure 3, using the low complexity method can more accurately detect the arrival of the frame, as opposed to the previously mentioned methods, the same is that they must signal to noise ratio to 10dB or more to achieve better performance. Of course, with the rate increase, also need a corresponding increase in signal to noise ratio; other advantages of this method is mainly reflected in the low hardware complexity, and the threshold setting is relatively simple. China Institute of Metrology No. 278 16 3 Conclusion In this paper, IEEE802.1laOFDM system based on the frame structure, a use of the information contained in the frame itself, the frame detection method that can achieve low complexity, and optimization of OFDM to achieve The hardware implementation and follow-up work has important reference value. 【References [1] E2] [3] E43Es] IEEEStd802.11a a 1999. WilelessIANMediumAccessControl (MAC) andPhysicalIAYER (PHY) specificar] tions; HighpeedPhysicalIayerinthe5GHZBand [S]. L. JYUNCHIU. DEJANMARK () VIC,[link widoczny dla zalogowanych], HAIYUNTANG. (Continued from page 270) () FDMReceiverDesign [M]. Berkeley: UniversityofCalfornia, 2000. WARNERWD, LEUNGC. OFDM / FMframesynchroni-zationformobileradiodatacommunication [J]. IEEETrans (VehTechn1),[link widoczny dla zalogowanych], 1993. 42:302-313. VANDEBEEKJJ,[link widoczny dla zalogowanych], SANDEIIM, ISAKSS () NM, etaI. IOWomplexframesynchroizationin () FDMsystemsEA]. IEEEIntconfUniversalPersonalCommunTorontoCanada, 1995. BA () GU () YANG, IETAIEFKB, CHENGRS, eta1. Timingrecoveryfor () FDMtransmission [J]. IEEEJournalonSelectedAreasinCommun. 2000. l8 :2278 - 2291. Ⅵ NAYKINGIE. JOHNGPR () AKIS. Implementation of digital signal processing and MATLAB [M]. Xi'an: Xi'an Electronic Industry Press, 2001. Signal). Figure 6 shows, the traditional vortex flowmeter is very sensitive to vibration, vortex flow signal superimposed on a strong signal interference. Floating in the use of differential sensor vortex flowmeter in the pipeline when struck by the interference has been greatly weakened by the differential amplification in almost no signal interference. 3 Conclusion In order to lower vortex flowmeter can measure flow, low flow of the signal, it is necessary to maximize the efficient flow of signal amplitude, which will reduce the amplitude of the noise interference, which improve the signal to noise ratio. An instrument for our work started, a novel sensor architecture - floating differential sensor. Experiments show that the vortex sensor signal to noise ratio can greatly improve, so that the existing anti-vortex flowmeter = F interference performance can be greatly improved. It is the theory of vortex flowmeter for research and engineering applications are of great significance. [I] [23 [3] [43 [5] 【Reference】 Xu Kejun. Lu Xun string. DSP-based spectrum analysis capabilities with the vortex flowmeter signal processing system [J]. Scientific Instrument, 2001,22 (3) :255-260. SUN Huai Qing. Jiang Zhongxia. Vortex flow meter (a) [J]. Automation Instrumentation. 1998 (9) :23-28. SUN Huai Qing. Jiang Zhongxia. Vortex Flowmeter (b) [J]. Automation Instrumentation. 1998 (10) :35-40. Meng Jianbo,[link widoczny dla zalogowanych], Zhu Lin Zhang. Fluid oscillations and vortex flow pipe vibration frequency measurement of the impact and the adaptive frequency measurement [J]. Automation Instrumentation,[link widoczny dla zalogowanych], 1992 (10) :17-22. Liu Yunsong, Guo Leiming. The installation of vortex flow sensors [J]. Measurement and testing technology. 1998 (6) :57-60.

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