A new direct-sequence UWB transceiver based on Bridge function sequence
ABSTRACT This paper reports how a novel direct-sequence UWB transceiver, utilizing Bridge function sequence as direct sequence, works in the wireless multipath environment. It is acknowledged that the Bridge function sequences have zero correlation zones (ZCZs) in their auto-correlation functions (ACFs). Due to the ZCZ properties of Bridge function sequences, the proposed direct-sequence UWB, using Bridge function sequence with properly chosen shift parameter, features a better performance on avoiding multipath interference than the one utilizing other spreading sequences without ZCZ. The theoretical justification of the proposed approach, together with its achievable performance in computer simulation, is presented in detail.
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ABSTRACT: This paper proposes a direct-sequence UWB Gaussian pulse of cognitive radio systems based on bridge function smart sequence matrix and the Gaussian pulse. As the system uses the spreading sequence code, that is the bridge function smart code sequence, the zero correlation zones (ZCZs) which the bridge function sequences’ auto-correlation functions had, could reduce multipath fading of the pulse interference. The Modulated channel signal was sent into the IEEE 802.15.3a UWB channel. We analysis the ZCZs’s inhibition to the interference multipath interference (MPI), as one of the main system sources interferences. The simulation in SIMULINK/MATLAB is described in detail. The result shows the system has better performance by comparison with that employing Walsh sequence square matrix, and it was verified by the formula in principle. KeywordsUWB-Bridge function-Smart code-BER-Cognitive radio-MPI01/1970: pages 41-46;