銆�銆�鐢变簬浜哄�戝皪閫氫俊鏁�(sh霉)鎿�(j霉)鍖�銆佸甯跺寲銆佸�嬩汉鍖栧拰绉诲嫊鍖栫殑杩垏闇�姹�锛�OFDM 鎶�琛撳湪缍滃悎鐒＄窔鎺ュ叆闋樺煙灏囪秺渚嗚秺寰楀埌寤ｆ硾鐨勬噳鐢�銆傞毃钁�DSP鑺墖鎶�琛撶殑鐧�(f膩)灞曪紝鍌呯珛钁夎畩鎻�/鍙嶈畩鎻�銆侀珮閫烳odem閲囩敤鐨�64/128/256QAM鎶�琛�銆佹煹鏍肩法纰兼妧琛�銆佽粺鍒ゆ焙鎶�琛�銆佷俊閬撹嚜閬╂噳鎶�琛撱�佹彃鍏ヤ繚璀锋檪娈�銆佹笡灏戝潎琛¤▓绠楅噺绛夋垚鐔熸妧琛撶殑閫愭寮曞叆锛屼汉鍊戝凡闁嬪闆嗕腑瓒婁締瓒婂鐨勭簿鍔涢枊鐧�(f膩)OFDM鎶�琛撳湪绉诲嫊閫氫俊闋樺煙鐨勬噳鐢�.闋愯▓绗笁浠ｄ互鍚庣殑绉诲嫊閫氫俊鐨勪富娴佹妧琛撳皣鏄疧FDM鎶�琛�銆�
銆�銆�20涓栫磤涓湡锛屼汉鍊戞彁鍑轰簡闋诲付娣风枈鐨勫杓夋尝閫氫俊鏂规锛岄伕鎿囩浉浜掍箣闁撴浜ょ殑杓夋尝闋荤巼浣滃瓙杓夋尝锛屼篃灏辨槸鎴戝�戞墍瑾殑姝ｄ氦闋诲垎寰╃敤锛圤rthogonalFrequencyDivisionMultiplexing锛孫FDM锛夋妧琛撱�傞�欑ó鈥滄浜も�濊〃绀虹殑鏄級娉㈤牷鐜囬枔绮剧⒑鐨勬暩(sh霉)瀛搁棞绯�銆傛寜鐓ч�欑ó瑷兂锛孫FDM鏃㈣兘鍏呭垎鍒╃敤淇￠亾甯跺锛屼篃鍙互閬垮厤浣跨敤楂橀�熷潎琛″拰鎶楃獊鐧�(f膩)鍣伈宸尟銆�
銆�銆�鐩墠锛孫FDM宸茬稉琚湅澶栫殑澶氬�嬫婧栭噰鐢紝濡侷EEE802.11a鍜孍TSI锛堟瓙娲查�氫俊妯欐簴瀛告渻锛夌殑HiperL-AN/2妯欐簴鍚屾ǎ閲囩敤OFDM浣滅偤瑾垮埗鏂瑰紡锛屾湁绶氬偝杓哥郴绲�(t菕ng)鐨勬噳鐢ㄤ篃鍚屾ǎ閲囩敤浜嗗熀浜嶰FDM鐨勮鍒跺京鐢ㄦ妧琛擄紝濡傚湪xDSL涓殑闆㈡暎澶氶煶闋荤郴绲�(t菕ng)鍜屾湁绶氳鍒跺櫒鎳夌敤銆�
銆�銆�OFDM鏄竴绋壒娈婄殑澶氳級娉㈣鍒舵妧琛�锛岀敤鎴剁殑淇℃伅棣栧厛瑕佺稉閬庝覆琛屽埌骞惰鐨勮綁鎻�锛岃綁璁婃垚澶氬�嬩綆閫熺巼鐨勬暩(sh霉)鎿�(j霉)纰兼祦锛岄�氶亷绶ㄧ⒓涔嬪悗锛岃鍒剁偤灏勯牷淇¤櫉锛屽偝绲�(t菕ng)鐨勮鍒舵妧琛撳湪鍚屼竴鍊嬫檪鍒诲彧鑳界敤涓�绋牷鐜囬�茶鏁�(sh霉)鎿�(j霉)鐨勫偝閫�锛岃�孫FDM鍓囧彲浠ュ湪姝ｄ氦鐨勯牷鐜囦笂鍚屾檪鐧�(f膩)閫佸璺俊铏燂紝鍙互瑾槸骞惰鐨勫偝閫佸璺俊铏�锛岄�欐ǎOFDM鑳藉鍏呭垎鍦板埄鐢ㄤ俊閬撶殑甯跺銆侽FDM涓嶇敤甯堕�氭烤娉㈠櫒渚嗗垎闅斿瓙杓夋尝锛岃�屾槸閫氶亷蹇�熷倕绔嬭憠璁婃彌锛團FT锛変締閬哥敤閭ｄ簺鍗充究娣风枈涔熻兘澶犱繚鎸佹浜ょ殑娉㈠舰銆�
銆�銆�OFDM鐩＄閭勬槸涓�绋牷鍒嗗京鐢紙FDM锛�锛屼絾宸插畬鍏ㄤ笉鍚屼簬閬庡幓鐨凢DM銆侽FDM鐨勬帴鏀舵瀵﹂殯涓婃槸閫氶亷FFT瀵︾従(xi脿n)鐨勪竴绲勮В瑾垮櫒銆傚畠灏囦笉鍚岃級娉㈡惉绉昏嚦闆堕牷锛岀劧鍚庡湪涓�鍊嬬⒓鍏冨懆鏈熷収绌嶅垎锛屽叾浠栬級娉俊铏熺敱浜庤垏鎵�绌嶅垎鐨勪俊铏熸浜�锛屽洜姝や笉鏈冨皪淇℃伅鐨勬彁鍙栫敘鐢熷奖闊裤�侽FDM鐨勬暩(sh霉)鎿�(j霉)鍌宠几閫熺巼涔熻垏瀛愯級娉㈢殑鏁�(sh霉)閲忔湁闂�銆�
銆�銆�OFDM绯荤当(t菕ng)鐨勫瓙杓夋尝鍙互鑷仼鎳夊湴鏍规摎(j霉)淇￠亾鐨勬儏娉侀伕鎿囪鍒舵柟寮忥紝骞朵笖鑳藉瀵︾従(xi脿n)鍦ㄥ悇绋鍒舵柟寮忎箣闁撶殑鍒囨彌銆傞伕鎿囧拰鍒囨彌鐨勫師鍓囨槸闋昏瓬鍒╃敤鐜囧拰瑾ょ⒓鐜囦箣闁撶殑骞宠 閬告搰銆傚湪閫氬父鐨勯�氫俊绯荤当(t菕ng)涓�锛岀偤浜嗕繚鎸佷竴瀹氱殑鍙潬鎬э紝閬告搰閫氶亷閲囩敤鍔熺巼鎺у埗鍜岃嚜閬╂噳瑾垮埗鍗�(xi茅)瑾垮伐浣滅殑鎶�琛�銆備俊閬撳ソ鐨勬檪鍊�锛岀櫦(f膩)灏勫姛鐜囦笉璁婏紝鍙互澧炲挤瑾垮埗鏂瑰紡锛堝64QAM锛�锛屾垨鑰呭湪浣庤鍒讹紙濡俀PSK锛夋檪闄嶄綆鐧�(f膩)灏勫姛鐜�銆傚姛鐜囨帶鍒惰垏鑷仼鎳夎鍒惰鍙栧緱骞宠 锛屼篃灏辨槸瑾皪浜庝竴鍊嬮仩绔櫦(f膩)灏勮嚭锛屽畠鏈夎壇濂界殑淇￠亾锛岃嫢鐧�(f膩)閫佸姛鐜囦繚鎸佷笉璁婏紝鍙娇鐢ㄨ純楂樼殑瑾垮埗鏂规濡�64QAM锛涜嫢鍔熺巼鍙互娓涘皬锛岃鍒舵柟妗堜篃鐩告噳闄嶄綆锛屽彲浣跨敤QPSK銆�
銆�銆�鈶犲箑妾㈡脯锛屸憽杓夋尝闋荤巼鍋忓樊鍙婃牎姝ｏ紝鈶㈤噰妯ｅ亸宸強鏍℃銆�
銆�銆�鐢变簬鍚屾鏄疧FDM鎶�琛撲腑鐨勪竴鍊嬮洠榛�锛屽洜姝�锛屽緢澶氫汉涔熸彁鍑轰簡寰堝OFDM鍚屾绠楁硶锛屼富瑕佹槸閲濆皪寰挵(hu谩n)鎿村睍鍜岀壒娈婄殑瑷撶反搴忓垪浠ュ強灏庨牷淇¤櫉渚嗛�茶锛屽叾涓純甯哥敤鐨勬湁鍒╃敤濂囩暟鍊煎垎瑙ｇ殑ESPRIT鍚屾绠楁硶鍜孧L浼拌▓绠楁硶锛屽叾涓璄SPRIT绠楁硶闆栫劧浼拌▓绮惧害楂�锛屼絾瑷堢畻寰╅洔锛岃▓绠楅噺澶�锛岃�孧L绠楁硶鍒╃敤OFDM淇¤櫉鐨勫惊鐠�(hu谩n)鍓嶇洞锛屽彲浠ユ湁鏁堝湴灏峅FDM淇¤櫉閫茶闋诲亸鍜屾檪鍋忕殑鑱�(li谩n)鍚堜及瑷堬紝鑰屼笖鑸嘐SPRIT绠楁硶鐩告瘮锛屽叾瑷堢畻閲忚灏忓緱澶氥�傚皪OFDM鎶�琛撶殑鍚屾绠楁硶鐮旂┒寰楁瘮杓冨锛岄渶瑕佹牴鎿�(j霉)鍏烽珨鐨勭郴绲�(t菕ng)鍏烽珨瑷▓鍜岀爺绌讹紝鍒╃敤鍚勭ó绠楁硶铻嶅悎閫茶鑱�(li谩n)鍚堜及瑷堟墠鏄彲琛岀殑銆侽FDM绯荤当(t菕ng)灏嶅畾鏅傞牷鍋忕殑瑕佹眰鏄皬浜嶰FDM绗﹁櫉闁撻殧鐨�4[%]锛屽皪闋荤巼鍋忕Щ鐨勮姹傚ぇ绱勮灏忎簬瀛愯級娉㈤枔闅旂殑1[%]锝�2[%]锛岀郴绲�(t菕ng)鐢㈢敓鐨�3dB鐩镐綅鍣伈甯跺澶х磩鐐哄瓙杓夋尝闁撻殧鐨�0.01[%]锝�0.1[%]銆�
銆�?銆�?锛夌法纰硷細鍦ㄥ熀浜嶰FDM瑾垮埗鎶�琛撶殑绯荤当(t菕ng)涓�锛岀法纰奸噰鐢≧eed-Solomon纰�銆佸嵎绌嶇尘閷⒓銆佺董鐗规瘮纰兼垨TURBO纰�銆�
銆�銆�锛�2锛変氦绻旓細浜ょ箶鍣ㄧ敤浜庨檷浣庡湪鏁�(sh霉)鎿�(j霉)淇￠亾涓殑绐佺櫦(f膩)閷锛屼氦绻斿悗鐨勬暩(sh霉)鎿�(j霉)閫氶亷涓�鍊嬩覆骞惰杞夋彌鍣紝灏嘔Q鏄犲皠鍒颁竴鍊嬬浉鎳夌殑鏄熷骇鍦栦笂銆傚湪閫欓噷I浠ｈ〃鍚岀浉淇¤櫉锛孮浠ｈ〃姝ｄ氦淇¤櫉銆�
銆�?銆�?锛夋暩(sh霉)瀛楄鍒讹細鍦∣FDM鏂瑰紡涓紝閲囩敤鏄熷骇鍦栧皣绗﹁櫉鏄犲皠鍒扮浉鎳夌殑鏄熷骇榛炰笂銆傞�欎竴閬庣▼鐢㈢敓IQ鍊�锛屽畠鍊戣閬庢烤骞堕�佸埌IFFT涓婇�茶璁婃彌銆�
銆�?銆�?锛夋彃鍏ュ皫闋伙細鐐轰簡鑳藉浣挎帴鏀剁┅(w臎n)瀹氾紝鍦ㄦ瘡48鍊嬪瓙杓夋尝涓彃鍏�4鍊嬪皫闋讳俊鎭�銆�
銆�?銆�?锛変覆骞惰綁鎻涳細浣夸覆琛岃几鍏ョ殑淇¤櫉浠ュ苟琛岀殑鏂瑰紡杓稿嚭鍒癕姊濈窔璺笂銆傞�橫姊濈窔璺笂鐨勪换浣曚竴姊濅笂鐨勬暩(sh霉)鎿�(j霉)鍌宠几閫熺巼鍓囩偤R/M纰煎瓧/绉�銆�
銆�銆�锛�6锛夊揩閫熷倕绔嬭憠閫嗚畩鎻涳細蹇�熷倕绔嬭憠閫嗚畩鎻涘彲浠ユ妸闋诲煙闆㈡暎鐨勬暩(sh霉)鎿�(j霉)杞夊寲鐐烘檪鍩熼洟鏁ｇ殑鏁�(sh霉)鎿�(j霉)銆傜敱姝�锛岀敤鎴剁殑鍘熷杓稿叆鏁�(sh霉)鎿�(j霉)灏辫OFDM鎸夌収闋诲煙鏁�(sh霉)鎿�(j霉)閫茶浜嗚檿鐞嗐��
銆�?銆�?锛夊苟涓茶綁鎻涳細鐢ㄤ簬灏囧苟琛屾暩(sh霉)鎿�(j霉)杞夋彌鐐轰覆琛屾暩(sh霉)鎿�(j霉)銆�
銆�?銆�?锛夋彃鍏ュ惊鐠�(hu谩n)鍓嶇洞骞跺姞绐楋細寰挵(hu谩n)鍓嶇洞鐐哄柈鍊嬬殑OFDM绗﹁櫉鍓�(chu脿ng)寤轰竴鍊嬩繚璀峰付锛屽湪淇″櫔姣旈倞绶ｆ悕鑰椾腑琚笩鎺�锛屼互妤靛ぇ鍦版笡灏戠铏熼枔骞叉摼銆�
銆�銆�鐢变簬鐧�(f膩)閫佺鍜屾帴鍙楃涔嬮枔鐨勯噰妯ｆ檪閻樻湁鍋忓樊锛屾瘡鍊嬩俊铏熸ǎ鏈兘涓�瀹氱▼搴﹀湴鍋忛洟瀹冩纰虹殑閲囨ǎ鏅傞枔锛屾鍋忓樊闅ㄦǎ鏈暩(sh霉)閲忕殑澧炲姞鑰岀窔鎬у澶�锛岀洝绠℃檪闁撳亸宸牬澹炲瓙杓夋尝涔嬮枔鐨勬浜ゆ�э紝浣嗘槸閫氬父鎯呮硜涓嬪彲浠ュ拷鐣ヤ笉瑷�銆傜暥閲囨ǎ閷鍙互琚牎姝ｆ檪锛屽氨鍙互鐢ㄥ収鎻掓烤娉㈠櫒渚嗘帶鍒舵纰虹殑鏅傞枔閫茶閲囨ǎ銆�
銆�銆�鐩镐綅鍣伈鏈夊叐鍊嬪熀鏈殑褰遍熆锛屽叾涓�鏄皪鎵�鏈夌殑瀛愯級娉㈠紩鍏ヤ簡涓�鍊嬮毃姗熺浉浣嶈畩閲�锛岃窡韫ゆ妧琛撳拰宸垎妾㈡脯鍙互鐢ㄤ締闄嶄綆鍏卞悓鐩镐綅瑾ゅ樊鐨勫奖闊�锛屽叾娆′篃鏈冨紩鍏ヤ竴瀹氶噺鐨勪俊閬撻枔骞叉摼锛圛CI锛�锛屽洜鐐虹浉浣嶈宸皫鑷村瓙杓夋尝鐨勯枔闅斾笉鍐嶆槸绮剧⒑鐨�1/T浜�銆�
銆�銆�杓夋尝闋荤巼鐨勫亸绉绘渻浣垮瓙淇￠亾涔嬮枔鐢㈢敓骞叉摼銆侽FDM绯荤当(t菕ng)鐨勮几鍑轰俊铏熸槸澶氬�嬬浉浜掕钃嬬殑瀛愪俊閬撶殑鐤婂姞锛屽畠鍊戜箣闁撶殑姝ｄ氦鎬ф湁鍤存牸鐨勮姹�銆傜劇绶氫俊閬撴檪璁婃�х殑涓�绋叿楂旈珨鐝�(xi脿n)灏辨槸澶氭櫘鍕掗牷绉�锛屽鏅嫆闋荤Щ鑸囪級娉㈤牷鐜囦互鍙婄Щ鍕曡嚭鐨勭Щ鍕曢�熷害閮芥垚姝ｆ瘮銆傚鏅嫆灞曞鏈冨皫鑷撮牷鐜囩櫦(f膩)鐢熷綄鏁�锛屽紩璧蜂俊铏熺櫦(f膩)鐢熺暩璁�銆傚緸闋诲煙涓婄湅锛屼俊铏熷け鐪熸渻闅ㄧ櫦(f膩)閫佷俊閬撶殑澶氭櫘鍕掓摯灞曠殑澧炲姞鑰屽姞鍔�銆傚洜姝ゅ皪浜庤姹傚瓙杓夋尝鍤存牸鍚屾鐨凮FDM绯荤当(t菕ng)渚嗚锛岃級娉㈢殑闋荤巼鍋忕Щ鎵�甯朵締鐨勫奖闊挎渻鏇村姞鍤撮噸锛屽鏋滀笉閲囧彇鎺柦灏嶉�欑ó淇￠亾闁撳共鎿撅紙ICI锛夊姞浠ュ厠鏈嶏紝绯荤当(t菕ng)鐨勬�ц兘寰堥洠寰楀埌鏀瑰杽銆�
缍韩闆诲瓙閫氾紝闆诲瓙鐭ヨ瓨锛屼竴鏌ョ櫨閫氾紒
宸叉敹閷勮姊�168812鍊�
