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OVSF (Orthogonal Variable Spreading Factor) codes are used as channelization codes in WCDMA system. OVSF codes are getting popular due to his efficiency and flexibility to allocate variable bite rates for different bandwidth requirement of applications. A core design issue of OVSF code allocation schemes is to utilize the codes efficiently such that more data can be forwarded to subscribers and as...
A logic function can be represented and simplified by binary decision diagrams (BDDs). This paper presents the new representation and simplification method of logic function using BDDS. Compared with logic expressions or truth tables, BDDS have unique features, such as unique concise representation, processing speed, and the memory space, etc.
A GALS Networks-on-Chip (NoC) router with QoS support is presented. It supports multi-levels of QoS including hard guarantees (Hard GT)and statistical guarantees (Soft GT). In hard GT, novel Rate-control schedule is adopted to decouple the relationship between bandwidth and delay. And then, different from other routers whose bandwidth left was absorbed by only BE packets, we also support soft GT to...
The notion of quality is an important factor in the design of any complex communication system. Since most communication systems are increasingly dependent on packet switching as the underlying transport mechanism, this paper explores the impact of levels of quality that a packet switched system can have on cost. Several interesting results are presented that result in the notion of an optimum level...
Jitter is, potentially, the largest source of degradation in the quality of voice in VoIP systems. This paper presents an analytical solution to the following question: How is jitter impacted by the number of hops that VoIP packets travel over and, if the end-to-end jitter were to be bounded to a predefined value, how would the resources in the network need to be scaled up as the number of hops increases?...
As an experimental tool for analyzing movement of chaos, we intend to introduce the correlation dimension for analyzing vibration signals of rotor system in this paper. For noise corruption existing in field-measured vibration signal, morphological filter is also introduced for de-noising the vibration signal. The analysis and comparison between the correlation dimensions of the noised and de-noised...
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