水下语音通信系统的设计与实现电子与通信工程专业论文.docxVIP

Abs仃actAbstract Abs仃act Abstract In the process ofconst锄tly exploration a11d deVelopment oftbe mariIle resources， people’s requirement of underwater comm：uIlication is母．owiIlg．Voice comm嘶cation is oIle of t：he most illlportaIlt锄d direct way of urlderwater commuIlicatio玛wIlich mal【es the research on underv嘣er voiCe commullicatioIls more urgent．But iIl也e process of仃aIlSrIlission Voice will be a丘．ected by some not ideal characteristics of c11allIlel’such as serious of multiplicity e)(tensi01l，1inlited baIldwidth wllich is aVailable and lli曲1eVel of noise， So iIl t11e field of undenⅣater aCo戚ic commuIlicatioIl，it is urgent to seek a、Ⅳ乏哕wIlich can ensure uIldeMter voice tr卸smit reliably aIld stably． The technology of OmIogoml FrequenCy DiVision MultiplexiI培iIl unden)l碰er acoustic commuIlication own the characteristics of strong resistaIlce of Imrrowb锄d 缸er危rence，s仃ong anti-multipa_啦resist觚ce of mnDwbland砬e彘rence，11igh util娩ation of b锄d，bln“h嬲tlle disadⅥultage of mgh pe出t0-a_Verage ratio，h嬲a lli曲requirement南r syncllrollization， sensitiVe to tlle舭quenCy o凰et of carrier and p11ase noiSe．The tecllIlology of liIlear缸quency modulation(Chirp)signal spread spec㈣h2Ls some危atllres of sig商血cam anti-iIlterfereIlce，resistance to Doppler 丘equency s11ift， and resistance to decliIle and so on，but it 11as伽llts such as low band util让哦ion，system complex．Tms p印er design and real协an OFDM undemrater Voice co删mlIlication system based on雠quency ch卸spread SpectmtIl’the system llas low coII】plexity，strong枷i-舢hipat也g咖ng resistance to doppler丘equency s11iR a11d anti-noise锄d omer adVantage，it caIl enSure voiCe仃a11smit reliably and stably iIl tlle water． The IIlaill work arld illIloVations i11 t11is paper are summarized aS fouows： (1)The proposal of OFDM undem，ater Voice communication system b嬲ed on 丘equency ch卸spread spectmIIL The Voice co伽m血cation system combiIles with the adVantage oftwo technology of 0FDM and Ch卸spread spectmm and overcomes their shortCoIIlj吨s，iIl the complex unde刑ater acouStic c