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The ever growing demand for on-board space craft processing combined with the exponential advance in chip development and high pin count devices is resulting in an increased complexity in high reliability interconnect technology. When the thermal management, control of ground bounce, and power distribution issues are considered, achieving the requi...
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... SRD based UWB pulse generator circuit is implemented according to the design criteria in [4] and [5]. The main advantages of this circuit (shown in Fig. 5) are its sim- plicity and low cost. However, there are some limitations regarding this implementation. First, the pulse repetition rate is limited by the minority carrier lifetime of the device. Based on commercially available diodes, this corresponds to a maximum data rate of 200 MHz. Secondly, the diode operating point changes with ...
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Citations
... Photovoltaic arrays are the most common means of in-orbit energy generation; however, mechanical solar cell defects have the potential to impact their reliability considerably. In [10], wireless chip-to-chip communications and interconnects are discussed. Communication is critical for the aerospace application. ...
One of the latest achievements of the Internet usage is the availability of Web services technology. Web services provide an efficient and convenient way for service provisioning, exchanging and aggregating, which facilitates a resourceful platform for the aerospace industry. The aerospace industry usually involves products of complex synthesis of various technologies and sciences. These different technical resources can be provided in the form of Web services to increase their availability, efficiency and performance. However, in aerospace area, reliability is an ultimately important issue. In this paper, we target on providing a reliable Web service paradigm for the industry. We describe the methods of reliability enhancement by redundancy in space and redundancy in time, identify parameters impacting Web service reliability, and present a Web service composition algorithm. The replication algorithm and the detailed system configuration are described. The Web services are coordinated by a replication manager, which schedules the workload of the Web services and keeps updating the availability of each Web service. We also perform a series of experiments employing several replication schemes and compare them with a non-redundant single service to evaluate the reliability of the proposed paradigm. Finally, we also model the Web services with Petri-net and Markov chains to demonstrate the performance and reliability of the Web services.
An ultra-wide band (UWB) localization study by developing a Time-of-Arrival (TOA) algorithm is presented and experimentally verified. The technique and test setup presented in this work offers an easy to understand localization method utilizing the UWB technology. The challenges in designing UWB RF hardware and creating an effective algorithm for the UWB system have been overcome resulting in an accurate location estimation. The proposed system is promising to achieve high precision location estimation system.
In this paper, a CMOS ultra-wideband (UWB) pulse generator is designed in IBM 90 nm technology for on-chip wireless interconnect applications. A UWB pulse is generated using the triangular pulse generation technique. The output pulse is OOK modulated according to data and each data bit is preceded by a reference pulse. A maximum data rate of 2.5 Gb/s with transmitted reference is achieved when the pulse repetition rate of the input clock is 5 GHz. The pulse width is about 60 ps and the peak-to-peak amplitude is 502 mV with -3 dB bandwidth of 20 GHz from 15 to 35 GHz. The pulse generator dissipates no static current with dynamic energy consumption of only 1.42 pJ per pulse from 1.2 V supply. High transmission rate and ultra low power consumption make this simple circuit attractive for on-chip wireless interconnects.
The detection issues of ultrawideband (UWB) signals depend on the type of modulation scheme that is used during the transmission. Cross-modulation interference (CMI) is a problem that is specific to UWB pulse-position-modulation (PPM) signaling. In this paper, the effects of CMI on the performance of noncoherent UWB receivers are analyzed. The probabilities of error for transmitted-reference (TR) and energy detector (ED) receivers in the presence and absence of CMI are derived. Optimal and suboptimal CMI avoidance algorithms, which are based on novel acquisition techniques, are proposed for Rake receivers. The results show that the performance degradation in both receivers, which is due to the CMI effects, can be significant, depending on the modulation index. TR receivers still can be functional in the presence of CMI, and the target performance level determines the modulation index to be used. It is unlikely that effects of CMI on the performance of ED receivers in the presence of CMI are more severe relative to TR receivers, and the performance level is not acceptable. As a result, PPM signaling is not an appropriate modulation technique for ED receivers that are operating in the CMI region, unless CMI mitigation algorithms can be developed. Furthermore, the proposed optimal and suboptimal algorithms are two promising schemes for avoiding the CMI effects and, consequently, for improving the performance of Rake receivers operating in the CMI region.
