针对IR-UWB(impulse radio-ultra wideband)测距定位系统中目前已有的几种非相干TOA(time of arrival)估计算法的不足,提出了一种基于能量采样序列的最大最小值比(MMR,maximum to minimum energy sample ratio)进行归一化门限设置的TC(t...针对IR-UWB(impulse radio-ultra wideband)测距定位系统中目前已有的几种非相干TOA(time of arrival)估计算法的不足,提出了一种基于能量采样序列的最大最小值比(MMR,maximum to minimum energy sample ratio)进行归一化门限设置的TC(threshold comparison)算法。通过仿真考察了最优归一化门限与MMR之间的关系,建立了以MMR为参量的最优归一化门限计算模型。该模型独立于信道模式,具有极好的通用性;同时还考虑了能量积分周期的影响,使得模型无须任何更动即可应用到不同的能量积分周期取值情况下,极大地增强了模型的灵活性。与已有的几种非相干TOA估计算法的性能对比表明,基于MMR进行门限设置的MMR-TC算法在所有信噪比范围内均能取得最优性能,验证了算法的有效性。展开更多
脉冲超宽带雷达回波信号由于带宽大而难以直接采样,文中设计并实现了一种基于FPGA的数字式脉冲超宽带雷达接收机。该接收机利用FPGA内嵌锁相环产生特定频率的时钟,驱动四路10 bit ADC器件,根据回波信号在一段时间内呈准静态及周期性的特...脉冲超宽带雷达回波信号由于带宽大而难以直接采样,文中设计并实现了一种基于FPGA的数字式脉冲超宽带雷达接收机。该接收机利用FPGA内嵌锁相环产生特定频率的时钟,驱动四路10 bit ADC器件,根据回波信号在一段时间内呈准静态及周期性的特点,实现了四通道时域伪随机等效采样。仿真及测试结果表明,该数字式脉冲超宽带雷达接收机等效采样速率可达10 GS/s,可有效接收雷达回波信号,满足脉冲超宽带雷达的应用需求。展开更多
This paper introduces a human gesture recognition algorithm using an impulse radio ultra-wide- band (IR-UWB) radar sensor. Human gesture recognition has been one of the hottest research topics for quite a long time. M...This paper introduces a human gesture recognition algorithm using an impulse radio ultra-wide- band (IR-UWB) radar sensor. Human gesture recognition has been one of the hottest research topics for quite a long time. Many gesture recognition algorithms or systems using other sensors have been proposed such as using cameras, RFID tags and so on. Among which gesture recognition systems using cameras have been extensively studied in past years and widely used in practical. While it might show some deficiencies in some cases. For example, the users might not like to be filmed by cameras considering their privacies. Besides, it might not work well in very dark environments. While RFID tags could be inconvenient to many people and are likely to be lost. Our gesture recognition algorithm uses IR-UWB radar sensor which has pretty high resolution in ranging and adjustable gesture recognition range, meanwhile, does not have problems in privacy issues or darkness. In this paper, the gesture recognition algorithm is based on the moving direction and distance change of the human hand and the change of the frontal surface area of hand towards radar sensor. By combining these changes while doing gestures, the algorithm may recognize basically 6 kinds of hand gestures. The experimental results show that these gestures are of quite good performance. The performance analysis from experiments is also given.展开更多
Impulse based Ultra wideband technology has been the motivation of many recent researches with the potential of many applications to be researched. The uniqueness of the physical characteristics of the generated signa...Impulse based Ultra wideband technology has been the motivation of many recent researches with the potential of many applications to be researched. The uniqueness of the physical characteristics of the generated signal combined with the high flexibility of for different data rates at the physical layer design level have been addressed in considerable number of researches recently. This paper presents in depth reviews of the different concepts of tunable impulse based ultra wideband from the different researchers views. Research proposals of Cross layer architectures as PHY-MAC aware Impulse based ultra wideband solutions, link-budget communication design with performance evaluations in different test beds implementations are investigated in this paper. Such in-depth review can help researchers in this field to have better understanding of the different possibilities of designing new impulse-based ultra wideband solutions for future potential communication scenarios. Special focus on utilizing the advantage of impulse-based ultra wideband signal design flexibility as integrator for different short to medium wireless infrastructures mainly sharing common design constraints and requirements. Finding remarks from reviewing nearest-field literature combined with researches benchmarking to inspire researches proposal for this topic.展开更多
A non-coherent receiver for impulse radio ultra-wide band（IR-UWB）is presented.The proposed receiver front-end consists of a high gain LNA,a high frequency detector and an intermediate frequency（IF）amplifier to amp...A non-coherent receiver for impulse radio ultra-wide band（IR-UWB）is presented.The proposed receiver front-end consists of a high gain LNA,a high frequency detector and an intermediate frequency（IF）amplifier to amplify the recovered signal and drive an external test instrument.To meet the requirements of high gain and a low noise figure（NF）under moderate power consumption for the LNA,capacitor cross coupled（CCC）and current reuse techniques were adopted.The detector consists of a squarer and an integrator.The overall circuit consumes 41.2mA current with a supply voltage of 1.8 V at a 400 MHz pulse rate.The resulting energy efficiency is 0.19 nJ/pulse.A chip prototype is implemented in 0.18-μm CMOS.The die area is 2.1×1.4 mm^2 and the active area is 1.7×0.98 mm^2.展开更多
文摘针对IR-UWB(impulse radio-ultra wideband)测距定位系统中目前已有的几种非相干TOA(time of arrival)估计算法的不足,提出了一种基于能量采样序列的最大最小值比(MMR,maximum to minimum energy sample ratio)进行归一化门限设置的TC(threshold comparison)算法。通过仿真考察了最优归一化门限与MMR之间的关系,建立了以MMR为参量的最优归一化门限计算模型。该模型独立于信道模式,具有极好的通用性;同时还考虑了能量积分周期的影响,使得模型无须任何更动即可应用到不同的能量积分周期取值情况下,极大地增强了模型的灵活性。与已有的几种非相干TOA估计算法的性能对比表明,基于MMR进行门限设置的MMR-TC算法在所有信噪比范围内均能取得最优性能,验证了算法的有效性。
文摘脉冲超宽带雷达回波信号由于带宽大而难以直接采样,文中设计并实现了一种基于FPGA的数字式脉冲超宽带雷达接收机。该接收机利用FPGA内嵌锁相环产生特定频率的时钟,驱动四路10 bit ADC器件,根据回波信号在一段时间内呈准静态及周期性的特点,实现了四通道时域伪随机等效采样。仿真及测试结果表明,该数字式脉冲超宽带雷达接收机等效采样速率可达10 GS/s,可有效接收雷达回波信号,满足脉冲超宽带雷达的应用需求。
文摘This paper introduces a human gesture recognition algorithm using an impulse radio ultra-wide- band (IR-UWB) radar sensor. Human gesture recognition has been one of the hottest research topics for quite a long time. Many gesture recognition algorithms or systems using other sensors have been proposed such as using cameras, RFID tags and so on. Among which gesture recognition systems using cameras have been extensively studied in past years and widely used in practical. While it might show some deficiencies in some cases. For example, the users might not like to be filmed by cameras considering their privacies. Besides, it might not work well in very dark environments. While RFID tags could be inconvenient to many people and are likely to be lost. Our gesture recognition algorithm uses IR-UWB radar sensor which has pretty high resolution in ranging and adjustable gesture recognition range, meanwhile, does not have problems in privacy issues or darkness. In this paper, the gesture recognition algorithm is based on the moving direction and distance change of the human hand and the change of the frontal surface area of hand towards radar sensor. By combining these changes while doing gestures, the algorithm may recognize basically 6 kinds of hand gestures. The experimental results show that these gestures are of quite good performance. The performance analysis from experiments is also given.
文摘Impulse based Ultra wideband technology has been the motivation of many recent researches with the potential of many applications to be researched. The uniqueness of the physical characteristics of the generated signal combined with the high flexibility of for different data rates at the physical layer design level have been addressed in considerable number of researches recently. This paper presents in depth reviews of the different concepts of tunable impulse based ultra wideband from the different researchers views. Research proposals of Cross layer architectures as PHY-MAC aware Impulse based ultra wideband solutions, link-budget communication design with performance evaluations in different test beds implementations are investigated in this paper. Such in-depth review can help researchers in this field to have better understanding of the different possibilities of designing new impulse-based ultra wideband solutions for future potential communication scenarios. Special focus on utilizing the advantage of impulse-based ultra wideband signal design flexibility as integrator for different short to medium wireless infrastructures mainly sharing common design constraints and requirements. Finding remarks from reviewing nearest-field literature combined with researches benchmarking to inspire researches proposal for this topic.
基金Project supported by the Ministry of Industry and Information Technology of China(No2009ZX03006-009)
文摘A non-coherent receiver for impulse radio ultra-wide band（IR-UWB）is presented.The proposed receiver front-end consists of a high gain LNA,a high frequency detector and an intermediate frequency（IF）amplifier to amplify the recovered signal and drive an external test instrument.To meet the requirements of high gain and a low noise figure（NF）under moderate power consumption for the LNA,capacitor cross coupled（CCC）and current reuse techniques were adopted.The detector consists of a squarer and an integrator.The overall circuit consumes 41.2mA current with a supply voltage of 1.8 V at a 400 MHz pulse rate.The resulting energy efficiency is 0.19 nJ/pulse.A chip prototype is implemented in 0.18-μm CMOS.The die area is 2.1×1.4 mm^2 and the active area is 1.7×0.98 mm^2.
