Synchronous satellites

In chaos-based digital communications, the differential chaos-shift keying (DCSK) system has been widely studied owing to its non-coherent demodulation without any synchronization. To date, BER performance of this system is investigated over various transmission channels such as noise, fading, multipath, and optical fiber. In this paper, for the first time, the BER performance of conventional DCSK system is evaluated over a land mobile satellite channel.

5p vispyker 16-11-2022 14 3   Download

The study a new problem class, the Two-Echelon Multi-Trip Multi-Traffic Pickup and Delivery Problem with Time Windows and Synchronization. We consider the synchronization process of transshipment at satellites between vehicles with the temporary storage mechanism. As the proposed problem consists of two echelons with two separate fleets of vehicles, we thus propose the bottom-up approach to solve the problem. The experiment is to study the proposed model and analyze the satellite synchronization.

8p spiritedaway36 28-11-2021 20 7   Download

Lecture Microwave and Satellite Systems - Week 8: Satellite Orbit Mechanics present the content: satellite orbit mechanics, synchronous orbit, orbital parameters, Kepler’s law, orbital aspects, types of orbits,...

19p bachdangky 06-09-2021 6 1   Download

Lecture Microwave and Satellite Systems - Week 3: Fundamentals of Satellite Systems present the content: evolution of communication satellites, synchronous satellites, international regulation frequency coordination and ITU-R, satellite frequency allocations and band spectrum,...

45p bachdangky 06-09-2021 6 1   Download

In this article, the time unifying terminal equipment has adopted the BeiDou satellite navigation receiver as the clock source and the output standard is IRIG-B code. The simulation results show that the algorithm reduces the synchronization errors of IRIG-B code, improves the timing synchronization precision, and fulfills the requirement of timing accuracy in the power system.

6p vivalletta2711 11-01-2020 12 0   Download

This report presents the results of a theoretical analysis of a frequency-hopping, multiple-frequency-shift-keyed, spread-spectrum communication system using a nonprocessing communication satellite transponder. A large number of users are assumed to be hopping pseudo-randomly about the transponder passband in time synchronization and approximate frequency synchronization. The users are assumed to ......

0p nunongnuna 03-04-2013 38 2   Download

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Maximum Likelihood Timing and Carrier Synchronization in Burst-Mode Satellite Transmissions

8p sting10 07-03-2012 52 4   Download

Nonlinear Amplification of Synchronous CDMA Overview As we have described in Chapter 3, the SS/CDMA uses orthogonal CDMA for both uplink and downlink transmission. On board the satellite, each CDMA channel is routed to a destination downlink beam by the Code Division Switch (CDS). All channels in the same output port of the CDS are combined and then amplified with a Traveling Wave Tube (TWT) amplifier for downlink transmission.

27p doroxon 16-08-2010 121 12   Download

Network Access and Synchronization Overview As we have described in Chapters 3 and 6, the SS/CDMA uses orthogonal CDMA in both uplink and downlink. The orthogonal CDMA can reject the interference between the user traffic channels and thus maximize the system capacity. However, the use of orthogonal CDMA in the uplink requires a network-wide synchronization of all satellite receptions (global synchronization). The accuracy of the synchronization at steadystate and the speed at which synchronization is acquired depends on the propagation environment, i.e.

23p doroxon 16-08-2010 73 14   Download