This paper presents a wideband frequency-shift keying （FSK） demodulator suitable for a digital data transmission chain of wireless neural stimulation microsystems such as cochlear implants and retinal prostheses. Th...This paper presents a wideband frequency-shift keying （FSK） demodulator suitable for a digital data transmission chain of wireless neural stimulation microsystems such as cochlear implants and retinal prostheses. The demodulator circuit derives a constant frequency clock directly from an FSK carrier, and uses this clock to sample the data bits. The circuit occupies 0.03 mm^2 using a 0.6 μm, 2M/2P, standard CMOS process, and consumes 0.25 mW at 5 V. This circuit was experimentally tested at transmission speed of up to 2.5 Mbps while receiving a 5-10 MHz FSK carrier signal in a cochlear implant system.展开更多
The decoupled coherent Maximum Likelihood (ML) detection algorithm presented in this letter can sharply reduce the complexity of the receiver as well as provide better error performance under the precondition that cha...The decoupled coherent Maximum Likelihood (ML) detection algorithm presented in this letter can sharply reduce the complexity of the receiver as well as provide better error performance under the precondition that channel should be estimated first. Considering the bandwidth inefficiency of Frequency Shift Keying (FSK), the acquisition of channel state information through training sequences will further decrease the transmission efficiency. This letter presents a blind channel estimation algorithm based on noise subspace theory which can acquire channel information without any training symbols. The simulation shows that the algorithm brings about fewer channel estimation errors while the frequency efficiency can be increased.展开更多
In the scenario of multiple wireless personal area networks （WPANs） accessing the home area network （HAN）, the frequency-shift （FRESH）filter based on the cyclostationary theory is applied for the anti-interferen...In the scenario of multiple wireless personal area networks （WPANs） accessing the home area network （HAN）, the frequency-shift （FRESH）filter based on the cyclostationary theory is applied for the anti-interference at the 2. 4 GHz spectrum. The main architecture of multiple WPANs accessing the HAN is proposed. The medium access control（ MAC） -level coordination solution applied in the access point （AP）for the coexistence of different communication protocols within WPAN is discussed. The diagram of the adaptive FRESH filter is described. The anti-interference models of the FRESH filter in the scenario of multiple WPANs accessing the HAN are proposed. The minimum mean square error （MMSE）convergence property of the FRESH filter with the change in the data point number is analyzed. The simulation results indicate that the FRESH filter can effectively extract the signal of interest （SOI） from the interference with the partly overlapped spectrum. Thus, the excellent anti-interference performance of the FRESH filter is validated. Moreover, by both theoretical analysis and simulation, the MMSE convergent property of the FRESH filter is also proven.展开更多
联合战术信息分发系统(Joint Tactical Information Distribution System,JTIDS)作为Link16的通信载体为多军种协同作战提供服务。当前,高精尖武器装备的数量激增,进而JTIDS终端增多,导致非正交跳频层叠网间的邻频干扰和同频干扰发生的...联合战术信息分发系统(Joint Tactical Information Distribution System,JTIDS)作为Link16的通信载体为多军种协同作战提供服务。当前,高精尖武器装备的数量激增,进而JTIDS终端增多,导致非正交跳频层叠网间的邻频干扰和同频干扰发生的概率很大。基于此,分析了改用高斯最小频移键控(Gaussian Minimum Shift Keying,GMSK)调制后,JTIDS的频谱特征。同时,仿真分析了改进系统对于互干扰和同频干扰的健壮程度。仿真结果表明,在邻频干扰和同频干扰下,JTIDS误码率显著提高,使用复杂度更高的GMSK解调的JTIDS性能比原系统更好。展开更多
针对第六代移动通信(The 6th Generation Mobile Communication,6G)中一体化需求感知精度较低的问题,提出一种基于最小频移键控(Minimum Shift Keying,MSK)与线性调频(Linear Frequency Modulation,LFM)的光载太赫兹通感一体化信号的产...针对第六代移动通信(The 6th Generation Mobile Communication,6G)中一体化需求感知精度较低的问题,提出一种基于最小频移键控(Minimum Shift Keying,MSK)与线性调频(Linear Frequency Modulation,LFM)的光载太赫兹通感一体化信号的产生与传输方案。利用MSK-LFM信号在太赫兹频段同时实现通信和感知测距,在通信接收端使用数字信号处理降低无线通信误码率,在感知接收端利用去啁啾技术进行测距。仿真结果表明,MSK-LFM信号在235 GHz太赫兹频段能够实现8 Gbit·s^(-1)的无线通信速率,在距离感知精度上达到了3.75 cm的距离分辨率,且通信误码率低于软判决阈值。当直流偏置为0.8时,8 GHz带宽的MSK-LFM信号通感性能达到平衡,该方案与M相移键控与线性调频(Phase Shift Keying,Linear Frequency Modulation,MPSK-LFM)信号方案相比,在相同通信速率下具有更高的感知测距精度。展开更多
A CMOS fully-differential 2.4GHz ∑-△ frequency synthesizer for Gaussian minimum shift keying （GMSK）modulation is presented. A pre-compensation fractional-N phase-locked loop（PLL）is adopted in the modulator.The t...A CMOS fully-differential 2.4GHz ∑-△ frequency synthesizer for Gaussian minimum shift keying （GMSK）modulation is presented. A pre-compensation fractional-N phase-locked loop（PLL）is adopted in the modulator.The transfer function of the type- Ⅱ third-order phase-locked loop is deduced,and the important parameters that affect the loop transfer function are pointed out. Methods to calibrate the important loop parameters arc introduced. A differential tuned LC-VCO and a fully-differential charge pump are adopted in the PLL design. The designed circuits are simulated in a 0.18gm 1P6M CMOS process. The power consumption of the PLL is only about llmW with the low power consideration in building blocks design, and the data rate of the modulator can reach 2Mb/s.展开更多
基金Project supported by the National Basic Research Program (973) of China (No. G2000036508) and the National Natural Science Foun-dation of China (No. 60475018)
文摘This paper presents a wideband frequency-shift keying （FSK） demodulator suitable for a digital data transmission chain of wireless neural stimulation microsystems such as cochlear implants and retinal prostheses. The demodulator circuit derives a constant frequency clock directly from an FSK carrier, and uses this clock to sample the data bits. The circuit occupies 0.03 mm^2 using a 0.6 μm, 2M/2P, standard CMOS process, and consumes 0.25 mW at 5 V. This circuit was experimentally tested at transmission speed of up to 2.5 Mbps while receiving a 5-10 MHz FSK carrier signal in a cochlear implant system.
文摘The decoupled coherent Maximum Likelihood (ML) detection algorithm presented in this letter can sharply reduce the complexity of the receiver as well as provide better error performance under the precondition that channel should be estimated first. Considering the bandwidth inefficiency of Frequency Shift Keying (FSK), the acquisition of channel state information through training sequences will further decrease the transmission efficiency. This letter presents a blind channel estimation algorithm based on noise subspace theory which can acquire channel information without any training symbols. The simulation shows that the algorithm brings about fewer channel estimation errors while the frequency efficiency can be increased.
基金The National Basic Research Program of China(973Program)(No.2007CB310606)the National Natural Science Foundation of China(No.60472053)+1 种基金the High Technology Research and Development Program of Jiangsu Province(No.BG2006002)the Specialized Development Foundation for the Achievement Transformation of Jiangsu Province(No.BA2006101)
文摘In the scenario of multiple wireless personal area networks （WPANs） accessing the home area network （HAN）, the frequency-shift （FRESH）filter based on the cyclostationary theory is applied for the anti-interference at the 2. 4 GHz spectrum. The main architecture of multiple WPANs accessing the HAN is proposed. The medium access control（ MAC） -level coordination solution applied in the access point （AP）for the coexistence of different communication protocols within WPAN is discussed. The diagram of the adaptive FRESH filter is described. The anti-interference models of the FRESH filter in the scenario of multiple WPANs accessing the HAN are proposed. The minimum mean square error （MMSE）convergence property of the FRESH filter with the change in the data point number is analyzed. The simulation results indicate that the FRESH filter can effectively extract the signal of interest （SOI） from the interference with the partly overlapped spectrum. Thus, the excellent anti-interference performance of the FRESH filter is validated. Moreover, by both theoretical analysis and simulation, the MMSE convergent property of the FRESH filter is also proven.
文摘联合战术信息分发系统(Joint Tactical Information Distribution System,JTIDS)作为Link16的通信载体为多军种协同作战提供服务。当前,高精尖武器装备的数量激增,进而JTIDS终端增多,导致非正交跳频层叠网间的邻频干扰和同频干扰发生的概率很大。基于此,分析了改用高斯最小频移键控(Gaussian Minimum Shift Keying,GMSK)调制后,JTIDS的频谱特征。同时,仿真分析了改进系统对于互干扰和同频干扰的健壮程度。仿真结果表明,在邻频干扰和同频干扰下,JTIDS误码率显著提高,使用复杂度更高的GMSK解调的JTIDS性能比原系统更好。
文摘A CMOS fully-differential 2.4GHz ∑-△ frequency synthesizer for Gaussian minimum shift keying （GMSK）modulation is presented. A pre-compensation fractional-N phase-locked loop（PLL）is adopted in the modulator.The transfer function of the type- Ⅱ third-order phase-locked loop is deduced,and the important parameters that affect the loop transfer function are pointed out. Methods to calibrate the important loop parameters arc introduced. A differential tuned LC-VCO and a fully-differential charge pump are adopted in the PLL design. The designed circuits are simulated in a 0.18gm 1P6M CMOS process. The power consumption of the PLL is only about llmW with the low power consideration in building blocks design, and the data rate of the modulator can reach 2Mb/s.
