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The Design of Wireless Image Transmission System Based on COFDM

Author: GuanZhong
Tutor: CaiDeLin
School: Anhui University
Course: Communication and Information System
Keywords: Coded orthogonal frequency stars Multiplexing Wireless image transmission System Testing
CLC: TN919.8
Type: Master's thesis
Year: 2010
Downloads: 137
Quote: 0
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Abstract


With the development of communication technology , wireless video transmission technology has been widely used in industrial and social life in various fields. Public safety the field of rescue and monitoring requirements in high-speed mobile 's environment to achieve video, voice , data, etc. broadband multimedia services 's real-time , synchronous transmission . While the wireless channel bandwidth is resources are limited, interference by many factors , the video signal large quantity of data , real-time Xing requirement is high. Solve these problems, This article explores will be COFDM technology is used high-speed mobile under the conditions of wireless image transmission the realization scheme . This paper introduces the COFDM the technical principle , the main advantages and existent deficiencies , focusing on discussed the based on COFDM technology of image transmission system the overall design of . COFDM system is the letter channel coding and OFDM technology combination , focusing on introduces of channel encoding, including outer encoding and an inner coding, data interleaving , comprises an outer interleaving and an inner intertwined, discusses how the system through a channel coding to fight against wireless channel brought by all age fading . System adopts structured design , according to the system overall requirements and indicators allocations will system is divided into multiple modules , including coding module, the data multiplexing module , COFDM modulation module , filter unit , low-noise put the unit, etc. . The article describes the each module unit functions , and combined specific technical indicators gives the each unit circuit design. System In the hardware implementation after the conducted a series of testing and environmental testing , further validate of the system design rational Xing and reliability of the . Test results show that the , the system basically meet the the design requirements, to achieve a in a typical urban environment under , in the 150km / h 's moving speed down image of reliable transmission . Currently, the system has been widely used commanding , rescue and other public safety fields.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Image communication, multimedia communication
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