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An adaptive image restoration algorithm based on 2-D bilateral filtering has been proposed to enhance the signal-to-noise ratio (SNR) of the intrusion location for phase-sensitive optical time domain reflectometry (Ф-OTDR) system. By converting the spatial and time information of the Ф-OTDR traces into 2-D image, the proposed 2-D bilateral filtering algorithm can smooth the noise and preserve the...
As the operating speed of high speed railway (HSR) ever increases, the train operation safety requirement is getting stricter and stricter. Among the various environment monitoring technologies, the microwave radar detection technology tends to civilian use and plays an important role in environmental safety monitoring. Though rich continuous spectrum resources are available in millimeter wave (mmWave)...
With large available continuous bandwidth, millimeter wave (mmWave) bands hold promise as a carrier frequency for fifth generation (5G) wireless communications. Moreover, mmWave bands also play an important role in radar detections. Based on this observation, we propose an mmWave wireless communication and radar detection integrated network architecture for railways, not only to increase the capacity...
In UWB communication system, to guarantee reliability and validity, receiver must know the characteristic of channel. Based on the difference and similarity between Rayleigh fading channel and UWB channel, we propose a modified channel estimation algorithm for MB-OFDM system considering complexity of cluster structure in UWB channel. Moreover, we make a parallel comparison of LS and MMSE algorithms...
Variable-weight optical orthogonal code (OOC) was introduced by G-C Yang for multimedia optical CDMA systems with multiple quality of service (QoS) requirement. In this paper, a construction for optimal variable-weight OOCs via cyclic difference families is given. Several new constructions for cyclic difference families are also given. By using these constructions, new optimal (n, W, 1, Q)-OOCs for...
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