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Research on Underwater Acoustic Fax Communication

Author: YuLiMin
Tutor: ChengEn
School: Xiamen University
Course: Radio Physics
Keywords: Fax Underwater acoustic communication Compression / decompression Spectrum analysis
CLC: TN929.3
Type: Master's thesis
Year: 2002
Downloads: 150
Quote: 1
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Abstract


Underwater acoustic channel is an extremely complex random time - space - frequency variable parameter channel , the presence of narrow-band , high noise , multipath interference , the the transmission attenuation large number of factors , is so far the most difficult of the wireless communication channel . Underwater acoustic communication technology has thus become the field of underwater acoustic technology in an extremely complex and challenging research direction . Fax communication used in the field of underwater acoustic , is a relatively new research topic . This thesis is a preliminary study and explore the water sound fax communication . In the field of commercial office , fax (Fax machine) is a widely used , very practical electronic devices . The fax the significance of the transmission and accurate reproduction of multi-page static text pages . Fax transmission in addition to the underwater acoustic channel with the significance of traditional fax transmission , there is a special significance : in the case of channel conditions and harsh , pure data communication can not be achieved , the fax transmission of the the serial image scanning transmission mechanism , another possible scheme of providing the data transmission text reproducible manner . This thesis is initially constructed a water sound fax communication system . PC fax software design and the underwater acoustic Fax Modem design . Strong multipath interference in underwater acoustic channel characteristics , as well as a the fax text file special redundancy features , this paper designed a special the fax file compression / decompression algorithms and modulation / demodulation scheme . With in BorlandC Builder 5 . 0 platform , using the VCL components and a large number of win32 API function to complete the of underwater acoustic Fax software programming , fax documents lossless compression and decompression of recovery, and print control . The thesis master chip , as the sound of water Fax Modem with TI 's high-performance DSP chip TMS320C542 digital frequency synthesizer modulation sending and receiving end of the the Goertzel spectrum analysis demodulation . Using TLC320AC01 audio level analog interface chip DSP and analog signal interface . Synchronous serial port for DSP communication between the PC asynchronous serial port , the paper designed a special DSP algorithms , using the software interface to achieve a match between the synchronous serial asynchronous serial communication .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Underwater communication ( Sonar communication)
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