In order to improve the performance of PCM/FM signal demodulation system, this paper studies a kind of Symbol Detection more (Multi-Symbol Detection, MSD) technology. First for PCM/FM in hardware demodulation, a serie...
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Because the reentry telemetry wireless channel multipath propagation effects and the effect, channel will introduce transmission time delay dispersion, caused between the PCM/FM telemetry signal crosstalk and signal t...
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The traditional method of demodulation for PCM/FM telemetry demodulation threshold is higher and the computation of the larger problem, research an orthogonal baseband after rotation, Symbol Detection (Multi - Symbol ...
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The signal noise ratio (SNR) of telemetry signals is low in the environment of reentry telemetry, MSD(Multi-Symbol Detection) technology can effectively improve PCM/FM telemetry signal demodulation performance. In vie...
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Based on maximum likelihood, research a new based on Symbol Detection (Multi-Symbol Detection, MSD) soft demodulation method of PCM/FM telemetry signals. Introduced the basic principle of the demodulation method and t...
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For PCM/FM telemetry signal demodulation, compared to traditional demodulation method, multiple Symbol Detection technology (Multi - Symbol Detection, MSD) is an effective method for a lower demodulation threshold.[1]...
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This is the story of three projects, which use three different research funding sources, coming together to demonstrate a small, but complete, instrumentation system that advances several technologies. The Onboard Sma...
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This is the story of three projects, which use three different research funding sources, coming together to demonstrate a small, but complete, instrumentation system that advances several technologies. The Onboard Smart Sensor (OSS) project is a Small Business Innovation Research (SBIR) project that incorporates IEEE 1451.4 sensors into an existing Common Airborne Instrumentation System (CAIS) based instrumentation system. These sensors are "smart" in that they can self-identify basic information via a Transducer Electronic Data Sheet (TEDS). The Enhanced Query Data Recorder (EQDR) is being developed under the T&E Science & Technology Spectrum Efficient Technology (S&T SET) portfolio. This recorder is based on the integrated Network Enhanced Telemetry (iNET) specifications. One of the objectives of iNET is to be able to query a recorder in real-time and transfer the request across a network telemetry link. The third project provides pulse code modulation (PCM) backfill to compensate for dropouts. One of the envisioned applications enabled by the iNET architecture is the ability to provide PCM displays in the control room that do not have dropouts. This is called PCM Backfill. The basic scenario is that PCM is both transmitted (as it traditionally has been via serial streaming telemetry (SST)) and recorded onboard. When dropouts occur, a request over the telemetry network is made to the recorder (the EQDR in this case) and the dropped portions of the PCM stream are sent over the telemetry network to backfill the ground display. By adding a PCM-to-Ethernet/iNET bridge, the OSS and legacy instrumentation system can provide data to both the standard PCM and to the EQDR. Combined, this mini-system demonstrates a vision of having intelligence and networking ability across the entire instrumentation system - from sensor to display.
Achieving ADPCM speech decoding algorithm based on FPGA technology. Firstly sampled voice signal is to be adaptive differential pulsecode, then encoded speech signal is decoded using FPGA technology, and decoded voic...
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ISBN:
(纸本)9781845649302
Achieving ADPCM speech decoding algorithm based on FPGA technology. Firstly sampled voice signal is to be adaptive differential pulsecode, then encoded speech signal is decoded using FPGA technology, and decoded voice signal is digitally synthesized combining with pulse code modulation techniques(PWM). Voice signal becomes digital signal after decoding, and it is converted into a pulse code modulation wave to driver synthetic speech signal horn.
This paper presents a dynamic model for simulating the heat dissipation and the impact of Phase Change Materials (PCMs) on the peak temperature in Lithium-ion batteries during discharging operation of a hybrid truck u...
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ISBN:
(纸本)9781479952687
This paper presents a dynamic model for simulating the heat dissipation and the impact of Phase Change Materials (PCMs) on the peak temperature in Lithium-ion batteries during discharging operation of a hybrid truck under different ambient temperatures. The study aims to eliminate the electrical systems used for heating batteries in low temperature ambient and to replace the current active cooling systems with passive cooling, using PCMs, in high temperature ambient. The model is constructed by coupling a one-dimensional model of the electrochemical processes with a two-dimensional model for the heat transfer, including PCM implementation in a cross section of a rectangular LiFePO_4 battery pack array. Two different cases are studied and compared, one when air is used (active cooling) and one when PCM is used (passive cooling). The results show that when the ambient temperature is the same as the initial temperature, the temperature drops when PCMs are used. For a higher ambient, the difference between active cooling and passive cooling is very low. For a low ambient, the PCM is not efficient for keeping the temperature at a safe temperature. This makes the use of PCM unpractical under low ambient conditions. Moreover, for a low current discharging process operating under high ambient temperature, an important nonuniformity appears inside the cell which can deteriorate the cells.
Promising advantages offered by resistive Non-Volatile Memories (NVMs) have brought great attention to replace existing volatile memory technologies. While NVMs were primarily studied to be used in the memory hierarch...
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ISBN:
(纸本)9783981537024
Promising advantages offered by resistive Non-Volatile Memories (NVMs) have brought great attention to replace existing volatile memory technologies. While NVMs were primarily studied to be used in the memory hierarchy, they can also provide benefits in Field-Programmable Gate Arrays (FPGAs). One major limitation of employing NVMs in FPGAs is significant power and area overheads imposed by the Peripheral Circuitry (PC) of NVM configuration bits. In this paper, we investigate the applicability of different NVM technologies for configuration bits of FPGAs and propose a power-efficient reconfigurable architecture based on Phase Change Memory (PCM). The proposed PCM-based architecture has been evaluated using different technology nodes and it is compared to the SRAM-based FPGA architecture. Power and Power Delay Product (PDP) estimations of the proposed architecture show up to 37.7% and 35.7% improvements over SRAM-based FPGAs, respectively, with less than 3.2% performance overhead.
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