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With the rapid advancement of mobile devices and crowdsourcing platforms, spatial crowdsourcing has attracted much attention from various research communities. A spatial crowdsourcing system periodically matches a number of locationbased workers with nearby spatial tasks (e.g., taking photos or videos at some specific locations). Previous studies on spatial crowdsourcing focus on task assignment strategies...
High performance Schottky Barrier Diodes (SBDs) with cut-off frequency (fc) ∼2.0 THz integrated into a 90nm SiGe BiCMOS technology for millimeter wave (mm-wave) applications are presented in this paper. To our knowledge, this is the highest reported fc for a SBD in a BiCMOS technology. The SBDs reported here have low reverse bias leakage with breakdown voltage of ∼5V, and have been integrated in the...
A manufacturable 130nm SiGe BiCMOS RF technology for high-performance mm-wave analog applications having a high-speed SiGe Heterojunction Bipolar Transistor (HBT) integrated into a full-featured RFCMOS is presented. The technology features a high performance (HP) SiGe HBTwith fT/fMAX of 260/320 GHz, a high breakdown (HB) HBT with BVCEO of 3.5V 130nm RF CMOS, and a full suite of passive devices. Specific...
Smart Grid (SG) is characterized by two-way flow of electricity and information and is capable of monitoring everything from power plants and customer preference to individual appliances. In this paper, we focus on applying 3GPP LTE release 8 technology to build a high-reliable and low-latency Distribution Automation (DA) network. Based on the documents released by Nation Institute of Standard and...
A Star Sensor based Fiber Optical Gyroscope Error Separation method (SSFES) was proposed, which can be applied in the Fiber Optical Gyroscope (FOG) performance evaluation and fault diagnosis for the space-borne Inertial Navigation System (INS) & Celestial Navigation System (CNS) combined navigation system. The method takes the satellite rotational angular rate and the attitude quaternion to separate...
In this paper, the throughput performance of uplink Base Station (BS) cooperation in a realistic multi-cell MIMO system is evaluated. We choose LTE Release 8 as our baseline, and propose a whole implementation scheme for uplink BS cooperation. First we propose a dynamic cooperative BS selection algorithm, in which each cell-edge user will be assigned a potential cooperative BS by comparing the reception...
The RF linearity characteristics of complementary (npn + pnp) SiGe HBTs are investigated with respect to bias and frequency dependence, for the first time. The differences in distortion performance between npn and pnp SiGe HBTs are examined. Overall, at low bias currents (e.g., for minimum RF noise), both devices exhibit similar linearity performance and power gain, while for higher bias currents...
This paper presents analysis of RF safe-operating- area of aggressively-biased cascode SiGe HBT power amplifier cores under large-signal operating conditions. It is demonstrated that as VC and |ZL| increase, the RF power threshold to cause catastrophic device failure is reduced. Comparisons between calculated results and measured data show excellent agreement.
The inverse-mode operational regime of silicon germanium (SiGe) heterojunction bipolar transistors (HBTs) has to date been largely ignored and is typically dismissed as a viable possibility for circuit applications due to the general perception of its limited dc and ac performance capabilities. In this paper, the inverse-mode performance of four distinct generations of SiGe HBTs is investigated and...
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