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In this work, we focus on the use of network coding in a wireless sensor network where data is already encoded at the source node with fountain codes, in particular LT or Raptor codes. These codes have a specific degree distribution to follow in order to obtain an efficient decoding process. However, adding a layer of network coding on such packets triggers a distorsion of the degree distribution...
This paper presents the theoretical analysis and the simulation results pertaining to the acquisition phase of the NPSK DS-SS system in the presence of noise and fast fading. A statistical approach is taken to accurately model the acquisition phase with fast fading. Using this statistical approach, the main performance criteria for the acquisition phase namely probabilities of detection and failure...
In this paper, a code acquisition system using pseudo-ternary maximum-length shift register sequences (pseudo-ternary M-sequence) is proposed. The pseudo-ternary M-sequence is based on the M-sequence and generated by simple methods. Furthermore, the delay-locked loop (DLL) using the pseudo-ternary M-sequence can improve a tracking error performance by comparison with the DLL using the {-1, +1}-valued...
Existing contention based nonpersistent medium access control protocols in Wireless Sensor Network (WSN) do not perform well in high contention. Their performances are affected by occurrence of collision due to uniform probability distribution in choosing Time Slot (TS) during backoff period. To address this issue nonuniform probability distribution was proposed. However success rate still drops for...
The paper presents a new analytical model for performance evaluation of multi-service communication systems. The paper considers for the first time multi-service systems in which each single traffic source can generate calls of different traffic classes, i.e. the multi-service systems with multi-service sources. To date only the models assuming that a single source of given class generates always...
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