For unmanned aerial vehicles (UAVs), high-precision measurement and high-speed communication are necessary to realize flight operational missions. In this paper, we propose an integrated system in a Doppler frequency offset environment. The combines orthogonal division multiplexing (OFDM) modulation with binary carrier (BOC) formulate OFDM+BOC composite signal through power control. High-precis...

Orthogonal transmitter diversity such as frequency diversity and time diversity is quite simple to implement and, with optimum signal combining, can take full advantage of fading multipath channels. However, such a scheme has a bandwidth efficiency that decreases inversely with the number of diversity branches making it less attractive in wireless communications applications. This paper conside...

It is well known that a faulty gearbox vibration signal exhibits an amplitude modulation (AM) as well as a phase modulation (PM). These modulation carry out a lot of useful information about health condition. This paper presents two approaches for modeling amplitude and phase modulation in gearbox vibration signal. These last are used to describe the vibration signal by a state space model. The...

This article will discuss the many available modulation technology options that are used for various EDGE systems, including direct-launch conversion transmitter (DCT), small-signal polar modulation (sometimes called “polar lite”), and large-signal open polar modulation, and compare them to the more effective, large-signal closed polar loop solution that delivers the best overall system perform...

With the continuous development of the software radio technology, the mode of communication signal modulation recognition is becoming an important research direction. The article describes the spectrum of the digital signal modulation recognition method and takes advantage of some of the modulation signal when some modulation signal have the same power spectral density correlation function of t...