| 1. |
- Dwivedi, Satyam, et al.
(författare)
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Optimizing resolution of signals in a low-IF receiver
- 2007
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Ingår i: ISSCS 2007. ; , s. 349-352
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Konferensbidrag (refereegranskat)abstract
- The resolution of the digital signal path has a crucial impact on the design, performance and the power dissipation of the radio receiver data path, downstream from the ADC. The ADC quantization noise has been traditionally included with the Front End receiver noise in calculating the SNR as well as BER for the receiver. Using the IEEE 802.15.4 as an example, we show that this approach leads to an over-design for the ADC and the digital signal path, resulting in larger power. More accurate specifications for the front-end design can be obtained by making SNRreq a function of signal resolutions. We show that lower resolution signals provide adequate performance and quantization noise alone does not produce any bit-error. We find that a tight bandpass filter preceding the ADC can relax the resolution requirement and a I-bit ADC degrades SNR by only 1.35 dB compared to 8-bit ADC. Signal resolution has a larger impact on the synchronization and a 1-bit ADC costs about 5 dB in SNR to maintain the same level of performance as a 8-bit ADC.
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| 2. |
- Dwivedi, Satyam, et al.
(författare)
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Power Scalable Digital Baseband Architecture for IEEE 802.15.4
- 2011
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Ingår i: 24th International Conference on VLSI Design, VLSI Design 2011, Held Jointly with 10th International Conference on Embedded Systems. ; , s. 30-35
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Konferensbidrag (refereegranskat)abstract
- We propose a power scalable digital baseband for a low-IF receiver for IEEE 802.15.4-2006. The digital section's sampling frequency and bit width are used as knobs to reduce the power under favorable signal and interference scenarios, thus recovering the design margins introduced to handle worst case conditions. We propose tuning of these knobs based on measurements of Signal and the interference levels. We show that in a 0.13u CMOS technology, for an adaptive digital baseband section of the receiver designed to meet the 802.15.4 standard specification, power saving can be up to nearly 85% (0.49mW against 3.3mW) in favorable interference and signal conditions.
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| 3. |
- Rahmathullah, Abu Sajana, 1986, et al.
(författare)
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A low-complexity algorithm for intrusion detection in a PIR-based Wireless Sensor Network
- 2009
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Ingår i: Intelligent Sensors, Sensor Networks and Information Processing (ISSNIP), 2009, Melbourne, Australia. - 9781424435173 ; , s. 337 - 342
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Konferensbidrag (refereegranskat)abstract
- We present a low-complexity algorithm for intrusion detection in the presence of clutter arising from wind-blown vegetation, using passive infra-red (PIR) sensors in a wireless sensor network (WSN). The algorithm is based on a combination of Haar transform (HT) and support-vector-machine (SVM) based training and was field tested in a network setting comprising of 15-20 sensing nodes. Also contained in this paper is a closed-form expression for the signal generated by an intruder moving at a constant velocity. It is shown how this expression can be exploited to determine the direction of motion information and the velocity of the intruder from the signals of three well-positioned sensors.
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| 4. |
- Sankaragomathi, K.A., et al.
(författare)
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Optimal power and noise allocation for analog and digital sections of a low power radio receiver
- 2008
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Ingår i: ISLPED'08. - New York, New York, USA : ACM Press. - 9781605581095 ; , s. 271-276
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Konferensbidrag (refereegranskat)abstract
- We determine the optimal allocation of power between the analog and digital sections of an RF receiver while meeting the BER constraint. Unlike conventional RF receiver designs, we treat the SNR at the output of the analog front end (SNRAD) as a design parameter rather than a specification to arrive at this optimal allocation. We first determine the relationship of the SNRAD to the resolution and operating frequency of the digital section. We then use power models for the analog and digital sections to solve the power minimization problem. As an example, we consider a 802.15.4 compliant low-IF receiver operating at 2.4 GHz in 0.13 μm technology with 1.2 V power supply. We find that the overall receiver power is minimized by having the analog front end provide an SNR of 1.3dB and the ADC and the digital section operate at 1-bit resolution with 18MHz sampling frequency while achieving a power dissipation of 7mW.
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