扩频通信简介。英文版。 A tutorial overview of spread spectrum principles. Covers both direct sequence and fast hopping methods. Theoretical equations are given to allow performance estimates. Relation to CDMA and TDMA is provided. Schematic of a code sequence
扩频调制 This lecture covers the fundamentals of spread spectrum modulation, which can be defined as any modulation technique that requires a transmission bandwidth much greater than the modulating signal bandwidth, independently of the bandwidth of the
authors: Ian F. Akyildiz, Won-Yeol Lee, Mehmet C. Vuran *, Shantidev Mohanty Abstract Today’s wireless networks are characterized by a fixed spectrum assignment policy. However, a large portion of the assigned spectrum is used sporadically and geogr
This paper introduces an approach for drill wear detection. Tool failure in machining processes will result in damages to workpiece. In this approach sound signal of drilling operation is recorded and analyzed in both time and frequency domains. Tre
