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A Design and Realizition for FH Multiplexing System Based on FPGA

Author: ChengWei
Tutor: SunJiaoYan
School: Dalian Maritime University
Course: Information and Communication Engineering
Keywords: FPGA Hopping Multiplexing Maritime Communications DDS Ad Hoc Networks
CLC: TN914.41
Type: Master's thesis
Year: 2010
Downloads: 103
Quote: 1
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Abstract


VHF communication system is one of the important components of ship detection and safety communications system. The system has been used indispensable communication method of the water search and rescue. Wireless mobile Ad Hoc networks (Ad Hoc) is consisted of a group of mobile terminals with wireless transceiver consisting of a temporary system that can achieve its very high frequency (VHF) transmission.Thus, the relevant paper proposed VHF transceiver based on single chip and ship consisting of wireless mobile ad hoc networks. However, the single-threaded processing and MCU is not enough, which affected the further application of the system.Therefore, the paper is contraposed the problems of the system and proposed FPGA implementation using frequency hopping multiple access system to improve programs.A hopping multiplexing system based on FPGA was designed and improved the multi-tasking capabilities with FPGA processing and high-speed multi-threaded computing power. Technology and frequency hopping technologies be reused with frequency hopping multiple access system, which used time division multiplexing to transmissit multiple information, including the digital voice and the data.In this system,the design’s hardware system is consisted of Xilinx Inc as the core controller, use Verilog HDL programming language to realize the software part that control the hopping of the working frequency of the digital frequency synthesizer,which be used to take the place of the VHF transceiver, and appeased the demand for modulation different frequency hopping carrier frequencies to overcome the VHF transceiver disadvantage of a long conversion time.In this thesis, the channel coded and GMSK modulation was designed, at the same time the system is realized the acquisition, processing, storing, sending and receiving of the multi-channel signal.At last the system is achieved the communications of the multi-ways of data and digital voice information in ways of point-to-point or point-to-multipoint.Simulation results show that:The hopping multiplexing communication system based on FPGA significantly improved the multi-speed parallel processing of data; the DDS greatly reduced the frequency switching time, improved multi-hop Ad Hoc network voice and data signals in real-time transmission capacity.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication systems ( transmission system) > Frequency hopping spread spectrum communication system > Frequency hopping communication
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