Jianchao Ji

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This paper studies a concurrent transmissions MAC (CT-MAC) protocol with power control and improves the best value of collision domain to make it more suitable for direct sequence ultra-wideband (DS-UWB) system. CT-MAC protocol realizes multi-channel transmission by identifying users with different spreading codes. In CT-MAC protocol, nodes of network(More)
This paper studies the Rake receiver for the direct sequence ultra-wideband (DS-UWB) system. SRake receiver and PRake receiver are employed to receive the UWB signal in the indoor dense multi-path UWB channel (IEEE P802.15.TG3a). In order to study how to improve the performance of receivers, different order of Gaussian pulses are discussed firstly. And(More)
In this study, the communication link equation of the UWB (Ultra-wideband) based outer space satellite formation is established. According to the wide bandwidth of UWB signal, free space loss of UWB signal should be calculated using integral within a frequency region. The problem of the selection of monocycle pulse which is suitable for UWB communication(More)
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