超宽带(Ultra-Wideband,UWB)技术能获得比现有无线定位技术更高的测距定位精度.本文主要讨论UWB定位技术的研究和应用,包括TOA/TDOA(Time/Time Difference of Arrival)等UWB定位方法、多径时延估计理论、非视距定位和协作式定位、多带OF...超宽带(Ultra-Wideband,UWB)技术能获得比现有无线定位技术更高的测距定位精度.本文主要讨论UWB定位技术的研究和应用,包括TOA/TDOA(Time/Time Difference of Arrival)等UWB定位方法、多径时延估计理论、非视距定位和协作式定位、多带OFDM(Orthogonal Frequency Division Multiplexing)定位和其他超宽带信号定位方式等方面,对其发展历程和现状进行了充分的叙述和分析,最后指出了仍存在的问题和值得进一步探讨的方向.展开更多
The design and implementation of a CMOS LC VCO with 3. 2-6. 1GHz tuning range are presented. This is achieved by enhancing the tuning capability of the binary-weighted band-switching MIM capacitor. The circuit has bee...The design and implementation of a CMOS LC VCO with 3. 2-6. 1GHz tuning range are presented. This is achieved by enhancing the tuning capability of the binary-weighted band-switching MIM capacitor. The circuit has been implemented in a 0. 18μm RF/Mixed-Signal CMOS process. The measured phase noise is - 101.67dBc/Hz at 1MHz offset from a 5.5GHz carrier,and the VCO core draws 9.69mA current from a 1.8V supply.展开更多
In the conventional multiband orthogonal frequency division multiplexing ultra wideband （MB-OFDM UWB ） receiver, the fast Fourier transform （FFT） algorithm is realized by the expensive and power-consuming digital ...In the conventional multiband orthogonal frequency division multiplexing ultra wideband （MB-OFDM UWB ） receiver, the fast Fourier transform （FFT） algorithm is realized by the expensive and power-consuming digital signal processor （DSP） chips. In this article, the lower power, lower cost, and lower complexity real-time analog surface acoustic wave （SAW） chirp Fourier transform devices were used to replace the DSP part. A MB-OFDM UWB receiver based on the M-C-M SAW chirp Fourier transform was presented, and the step of signal transformation from input signals was also depicted. The simulation results show that the proposed receiver provides similar bit error performance compared to the fully digital receiver when used in the channel environments proposed by the IEEE 802.15SG3a.展开更多
文摘超宽带(Ultra-Wideband,UWB)技术能获得比现有无线定位技术更高的测距定位精度.本文主要讨论UWB定位技术的研究和应用,包括TOA/TDOA(Time/Time Difference of Arrival)等UWB定位方法、多径时延估计理论、非视距定位和协作式定位、多带OFDM(Orthogonal Frequency Division Multiplexing)定位和其他超宽带信号定位方式等方面,对其发展历程和现状进行了充分的叙述和分析,最后指出了仍存在的问题和值得进一步探讨的方向.
文摘The design and implementation of a CMOS LC VCO with 3. 2-6. 1GHz tuning range are presented. This is achieved by enhancing the tuning capability of the binary-weighted band-switching MIM capacitor. The circuit has been implemented in a 0. 18μm RF/Mixed-Signal CMOS process. The measured phase noise is - 101.67dBc/Hz at 1MHz offset from a 5.5GHz carrier,and the VCO core draws 9.69mA current from a 1.8V supply.
基金This study is supported by National Natural Science Foundation of China(60271018)0pen Fund of Key Lab of 0ptical Communication and Light-wave Technology,(Beijing University of Posts and Telecommunications),Ministry of Education,China.
文摘In the conventional multiband orthogonal frequency division multiplexing ultra wideband （MB-OFDM UWB ） receiver, the fast Fourier transform （FFT） algorithm is realized by the expensive and power-consuming digital signal processor （DSP） chips. In this article, the lower power, lower cost, and lower complexity real-time analog surface acoustic wave （SAW） chirp Fourier transform devices were used to replace the DSP part. A MB-OFDM UWB receiver based on the M-C-M SAW chirp Fourier transform was presented, and the step of signal transformation from input signals was also depicted. The simulation results show that the proposed receiver provides similar bit error performance compared to the fully digital receiver when used in the channel environments proposed by the IEEE 802.15SG3a.
