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Adaptive Rake Receiver Joined with Chip Equalization for DS-CDMA UWB Systems over ISI Channels

Procedia engineering 2012年 29卷 3768-3773页

作者： Feng Wang Jiangsu Technology and Engineering Center of Meteorological Sensor Network Nanjing University of Information Science & Technology Nanjing 210044 China

Since there is much larger channel delay spread, there is serious inter-symbol interference (ISI) when ultrawideband (UWB) wireless communication systems work at high data speed. The serious ISI affects the performance of UWB systems seriously. In this paper, a scheme to suppress ISI is developed for direct sequence spread-code division multiple access (DS-CDMA) UWB systems with a high data speed and an adaptive joint chip equalization Rake (AJCE-Rake) receiver is proposed. The proposed AJCE-Rake receiver spreads the number of traditional Rake receiver taps to collect multi-path component and equalize the inter-chip interference simultaneously. Then the soft output of AJCE-Rake receiver is despreaded with the user's spreading code. Finally, the decision is made to recover the transmitted symbol. The simulation results verify that ISI is suppressed effectively and the system performance is improved evidently.

关键词： UWB ISI Rake receiver MMSE Chip equalization

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Bifurcation Analysis of the Colpitts Oscillator Driven by the Chaotic Pulse Signal

Bifurcation Analysis of the Colpitts Oscillator Driven by th...

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International Conference in Electrics, Communication and Automatic Control, ECAC 2011

作者： Li, Chunbiao Hu, Wen Ma, Wei Department of Mechanical and Electrical Engineering Jiangsu Institute of Economic and Trade Technology Nanjing210007 China State Key Laboratory of Millimeter Waves Southeast University Nanjing210096 China Engineering Technology Research and Development Center of Jiangsu Circulation Modernization Sensor Network Jiangsu Institute of Economic and Trade Technology Nanjing210007 China School of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics Nanjing210016 China

ISBN: (纸本)9781441988485

The dynamical behavior of Colpitts oscillator driven by chaotic pulse signal that is based on the bifurcation method is analyzed in this study. We present simulation results of bifurcation in the driven Colpitts system. Colpitts oscillator driven by sinusoidal signal and periodic pulse signal are taken as contrast to demonstrate the nonlinear approach for both the sinusoidal and the chaotic mode of operation. With the appropriate choice of driving signal, the Colpitts circuit can process a robust chaotic state. The bifurcation diagram shows a periodic or chaotic oscillation state determined by the factor of the driving signal. © Springer Science+Business Media, LLC 2012.

关键词： Bifurcation (mathematics)

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Design of a low power charge pump circuit for phase-locked loops

Design of a low power charge pump circuit for phase-locked l...

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2012 4th International High Speed Intelligent Communication Forum, HSIC 2012

作者： Xu, Huili Li, Zhiqun Institute of RF-and OE-ICs Southeast University China Engineering Research Center of RF-ICs and RF-Systems Ministry of Education Southeast University China Jiangsu Provincial Key Laboratory of Sensor Network Technology Wuxi 214135 China

ISBN: (纸本)9781467306751

In this paper, the design of a charge pump circuit suitable for lower power PLL-based frequency synthesizer is presented. The charge pump circuit was designed in 0.18m CMOS process. The proposed charge pump circuit improves current matching in a wide output voltage range by applying a wide input ranged operational amplifier. The percentage error of current mismatch for the output range from 0.3V to 1.7V is less than 0.005%. The power consumption of the proposed charge pump circuit is around 0.56mW at a supply voltage of 1.8V. © 2012 IEEE.

关键词： Charge pump circuits

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A 7-bit 26-MS/s SAR ADC in 0.18 m CMOS process for WSN application

A 7-bit 26-MS/s SAR ADC in 0.18 m CMOS process for WSN appli...

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2012 4th International High Speed Intelligent Communication Forum, HSIC 2012

作者： Yang, Ting Li, Zhiqun Institute of RF-and OE-ICs Southeast University China Engineering Research Center of RF-ICs and RF-Systems Ministry of Education Southeast University China Jiangsu Provincial Key Laboratory of Sensor Network Technology Wuxi 214135 China

ISBN: (纸本)9781467306751

A 7-bit 26MS/s SAR (successive approximation register) ADC is presented in this paper for the application of ZigBee receiver. Compared to the conventional method, the set-and-down method reduces the average switching energy by around 80%. Dynamic comparator is chosen to diminish the signal-dependent offset caused by the non-fixed input common-mode voltage. A prototype ADC was implemented in a CMOS 0.18-m technology. The ADC consumes 1.66 mW at 26MS/s under a 1.8-V supply. The post-simulation shows that SNDR and SFDR are 43.11dB and 57.49dB, when sampling 3.19921875 MHz sinusoid input signal at 26MHz sampling clock. © 2012 IEEE.

关键词： CMOS integrated circuits

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A 1.8-V 1.8 GHz LC VCO for WSN application

A 1.8-V 1.8 GHz LC VCO for WSN application

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2012 4th International High Speed Intelligent Communication Forum, HSIC 2012

作者： Zhao, Sheng Li, Zhiqun Institute of RF-and OE-ICs Southeast University China Engineering Research Center of RF-ICs and RF-Systems Ministry of Education Southeast University China Jiangsu Provincial Key Laboratory of Sensor Network Technology Wuxi 214135 China

ISBN: (纸本)9781467306751

A 1.8 GHz LC VCO in 1.8-V supply is presented. The VCO achieves low power consumption by optimum selection of inductance in the L-C tank. To increase the tuning range, a three-bit switching capacitor array is used for digital switched tuning. Designed in 0.18m RF CMOS technology, the proposed VCO achieves a phase noise of 126.2dBc/Hz at 1MHz offset and consumes 1.38mA core current at 1.8-V voltage supply. © 2012 IEEE.

关键词： Variable frequency oscillators

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A low power 0.3-3.8 GHz low-noise mixer with noise cancellation

A low power 0.3-3.8 GHz low-noise mixer with noise cancellat...

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2012 IEEE MTT-S International Microwave Workshop Series on Millimeter Wave Wireless technology and Applications, IMWS 2012

作者： Shen, Changguo Li, Zhiqun Institute of RF- and OE-ICs Southeast University China Engineering Research Center of RF-ICs and RF-Systems Ministry of Education Southeast University China Jiangsu Provincial Key Laboratory of Sensor Network Technology Wuxi 214135 China

ISBN: (纸本)9781467309028

This paper shows a low power low-noise mixer in RFCMOS 0.18μm technology that operates between 0.3-3.8GHz. The low power mixer has a Gilbert cell configuration which employs low-noise transconductors designed using the noise-cancelling technique. And the low-noise amplifier designs use the current-reused topology to reduce power consumption and employ a capacitive cross-coupled (CCC) gm-boosting to improve noise performance. This merged front-end achieves 11-17dB power conversion gain, a flat SSB noise figure of 7.3-11dB with IF 2MHz over the whole working range. It only consumes 1.69mA current from a 1.8V supply and its active area occupies only 0.04mm 2. © 2012 IEEE.

关键词： Noise figure

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UWB autocorrelation receiver based on average differential transmitted reference

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Journal of networks 2012年第11期7卷 1868-1875页

作者： Wang, Feng Ji, Xuande Wang, Yuyan Jiangsu Technology and Engineering Center of Meteorological Sensor Network Nanjing University of Information Science and Technology Nanjing China Department of Electrical Engineering and Automation Luoyang Institute of Science and Technology Luoyang China

There are strong noise components included in the reference signal and the received signal of the ultra- wideband (UWB) differential transmitted reference (DTR) autocorrelation receiver, which impact on the receiver's performance seriously. Therefore this paper proposes a autocorrelation receiver based on average differential transmitted reference (ADTR). This receiver averages the received signals within every frame of the previous symbol period to form the new reference signal. The received signals within each frame of the current symbol interval are also averaged to construct the new received signal, which is correlated with the new reference signal to restore the transmitted symbols. Theoretical analysis and simulation results confirm that BER performance of ADTR autocorrelation receiver is better than the DTR receiver. Compared with DTR receiver, the signal to noise ratio gains of the ADTR receiver are 1.1dB with Ns=3 and 2.1dB with Ns=6 respectively when BER=10-4. © 2012 ACADEMY PUBLISHER.

关键词： Signal to noise ratio

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Design of a low power 2GHz CMOS frequency divider for WSN applications

Design of a low power 2GHz CMOS frequency divider for WSN ap...

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2012 International Conference on Microwave and Millimeter Wave technology, ICMMT 2012

作者： Cao, Qinqing Li, Zhiqun Institute of RF and OE ICs Southeast University Nanjing 210096 China Engineering Research Center of RF-ICs and RF-Systems Ministry of Education Nanjing 210096 China Jiangsu Provincial Key Laboratory of Sensor Network Technology Southeast University Wuxi 214135 China

ISBN: (纸本)9781467321839

A 2 GHz programmable frequency divider is presented in this paper for Chinese and American band WSN applications. The divide ratio can be programmed from 720 to 960. The divider basically consists of a 15/16 dual-modulus prescaler and a programmable pulse-swallow counter. Forward phase switching technique is used to reduce power consumption and avoid glitches. Designed in 0.18-μm CMOS process, the 15/16 prescaler and pulse-swallow occupies a chip area of approximately 60 μm * 90 μm and 85 μm * 85 μm. The post-layout simulation shows that the divider can operate under input frequency ranging from 1GHz to 3GHz and consume 3.24 mW from a single 1.8V supply. © 2012 IEEE.

关键词： Phase locked loops

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A 1.8-V 1.8 GHz LC VCO for WSN application

A 1.8-V 1.8 GHz LC VCO for WSN application

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International High Speed Intelligent Communication Forum (HSIC)

作者： Sheng Zhao Zhiqun Li Engineering Research Center of RF-ICs & RF-Systems Southeast University Jiangsu Provincial Key Laboratory of sensor network technology Wuxi

A 1.8 GHz LC VCO in 1.8-V supply is presented. The VCO achieves low power consumption by optimum selection of inductance in the L-C tank. To increase the tuning range, a three-bit switching capacitor array is used for digital switched tuning. Designed in 0.18μm RF CMOS technology, the proposed VCO achieves a phase noise of -126.2dBc/Hz at 1MHz offset and consumes 1.38mA core current at 1.8-V voltage supply.

关键词： Voltage-controlled oscillators Tuning Phase noise Power demand Wireless sensor networks Switches Inductors

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An Appointment Based MAC Protocol for Wireless sensor networks

An Appointment Based MAC Protocol for Wireless Sensor Networ...

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International Conference on Cyber-Enabled Distributed Computing and Knowledge Discovery, CyberC

作者： Hao Liu Fulong Jiang Guoliang Yao Jiangsu Provincial Key Laboratory of Sensor Network Technology Southeast University Nanjing China National ASIC System Engineering Research Center Southeast University Nanjing China

Several asynchronous duty cycle MAC protocols have been proposed for low power in the wireless sensor networks. However, these proposed MACs pay little attention on the performance degradation in many-to-one communications which is the most common traffic pattern in wireless sensor networks. In this paper, we propose AB-MAC, an appointment based MAC protocol to overcome the effect of channel contention of multiple senders. In AB-MAC, a fusion appointment scheme is proposed to enable scheduled batch transmission for multiple senders with low overhead. This scheme improves the transmission efficiency of the current asynchronous MACs in many-to-one traffic pattern. The experimental results show that, comparing to X-MAC which is a leading asynchronous MAC, AB-MAC can achieve better performance in terms of throughput, latency and energy efficiency.

关键词： Receivers Wireless sensor networks Media Access Protocol Throughput Energy consumption Wireless communication

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