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For C4ISR (Command, Control, Communication, computer, Intelligence, Surveillance and Reconnaissance) system simulation and evaluation, the corresponding indexes system which is reasonable and acquirable is the key problem. To meet the need of effectiveness evaluation of C4ISR and taken the core competence of C4ISR for network-centric warfare(NCW) into consideration, we introduce and analyzes the conceptual...
NTP and IEEE1588 are two widely used protocols for clock synchronization in large distributed systems. NTP has its limitation that the synchronization accuracy is normally no better than 1 millisecond. The realization of the IEEE1588 system needs expensive components such as high-end microcontrollers or dedicated 1588 network hardware. This paper puts forward a method based on FPGA and short broadcast...
A high bandwidth critical path monitor (1 sample/ cycle at 4-5 GHz) capable of providing real-time timing margin information to a variable voltage/frequency scaling control loop is described. The critical path monitor tracks the critical path delay to within 1 FO2 inverter delay with a standard deviation less than 3 FO2 delays over process, voltage, temperature, and workload. The CPM is sensitive...
A circuit for on-chip measurement of long-term jitter, period jitter, and clock skew, is demonstrated. The circuit uses a single latch and a voltage-controlled delay element, and is evaluated in a stand-alone pad frame. Excellent reproduction of jitter measured by oscilloscope is shown. Measured jitter resolution is 1 ps or better. The circuit is also incorporated into a 2 GHz clock distribution network...
Effects of improved channel estimation are studied for a proposed IEEE 802.11n OFDM MIMO system. Three channel estimation methods are considered: maximum likelihood (ML), time-domain truncation (TDT) and model-based (MB). TDT and MB are particularly useful when the channel delay spread is short. For an MMSE receiver, MB shows a 1-2.5 dB improvement over ML on the packet error rate performance for...
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