OFDM
鐨勫熀鏈師鐞嗗墫鏋?/p>
1
浠?/p>
FDM
鍒?/p>
OFDM
鏃╂湡鍙戝睍鐨勬棤绾跨綉缁滄垨绉诲姩閫氫俊绯荤粺锛?/p>
鏄娇鐢ㄥ崟杞芥尝璋冨埗
(Single-carrier Modulation)
鎶�鏈紝鍗曡浇娉㈣皟鍒舵槸灏嗚浼犻�佺殑淇″彿
(
璇煶鎴栨暟鎹?/p>
)
锛岄殣钘忓湪涓�涓浇娉笂锛屽啀钘夌敱澶?/p>
绾夸紶閫佸嚭鍘汇�備俊鍙疯嫢鏄殣钘忎簬杞芥尝鐨勬尟骞咃紝鍒欐湁
AM
銆?/p>
ASK
璋冨埗绯荤粺锛涗俊鍙疯嫢鏄殣
钘忎簬杞芥尝鐨勯鐜囷紝
鍒欐湁
FM
銆?/p>
FSK
璋冨埗绯荤粺锛?/p>
淇″彿鑻ユ槸闅愯棌浜庤浇娉㈢殑鐩镐綅锛?/p>
鍒欐湁
PM
銆?/p>
PSK
璋冨埗绯荤粺銆?/p>
浣跨敤鍗曡浇娉㈣皟鍒舵妧鏈殑閫氳绯荤粺锛岃嫢瑕佸鍔犱紶杈撶殑閫熺巼锛屾墍椤讳娇鐢ㄨ浇娉㈢殑甯﹀蹇呴』
鏇村ぇ锛屽嵆浼犺緭鐨勭鍏冩椂闂撮暱搴?/p>
(Symbol Duration)
瓒婄煭锛岃�岀鍏冩椂闂寸殑闀跨煭浼氬奖鍝嶆姷
鎶楅�氶亾寤惰繜鐨勮兘鍔涖�傝嫢杞芥尝浣跨敤杈冨ぇ鐨勫甫瀹戒紶杈撴椂锛岀浉瀵圭殑绗﹀厓鏃堕棿杈冪煭锛岃繖鏍风殑
閫氳绯荤粺鍙鍙楀埌涓�鐐瑰共鎵版垨鏄櫔澹拌緝澶ф椂锛屽氨鍙兘浼氭湁杈冨ぇ鐨勮鐮佺巼
(Bit Error
Ratio, BER)
銆?/p>
涓洪檷浣庤В鍐充互涓婄殑闂锛屽洜姝ゅ彂灞曞嚭澶氳浇娉㈣皟鍒?/p>
(Multi-carrier Modulation)
鎶�鏈紝鍏?/p>
姒傚康鏄皢涓�涓緝澶х殑甯﹀鍒囧壊鎴愪竴浜涜緝灏忕殑瀛愰�氶亾
(Subchannel)
鏉ヤ紶閫佷俊鍙凤紝鍗虫槸
浣跨敤澶氫釜瀛愯浇娉?/p>
(Subcarrier)
浼犳潵閫佷俊鍙凤紝鍒╃敤杩欎簺杈冪獎鐨勫瓙閫氶亾浼犻�佹椂锛屼細浣垮瓙
閫氶亾鍐呯殑姣忎竴涓瓙杞芥尝鐨勪俊閬撻鐜囧搷搴旂湅浼煎钩鍧︼紝杩欏氨鏄垎棰戝浠诲姟
(Frequency
Division Multiplexing, FDM)
瑙傚康銆?/p>
鍥犱负甯﹀鏄竴涓湁闄愮殑璧勬簮锛岃嫢棰戣氨涓婅浇娉㈠彲浠ラ噸杩娇鐢紝閭ｅ氨鍙互鎻愰珮棰戣氨鏁堢巼
(Spectrum Efficiency,畏)
锛屾墍浠ユ湁瀛﹁�呮彁鍑烘浜ゅ垎棰戝浠诲姟
(Orthogonal Frequency
Division Multiplexing, OFDM)
鐨勬妧鏈灦鏋勩�?/p>
FDM
涓?/p>
OFDM
涓よ�呮渶澶х殑宸紓锛屽湪
OFDM
绯荤粺鏋舵瀯涓瘡涓瓙淇￠亾涓婄殑瀛愯浇娉㈤鐜囨槸浜掔浉姝ｄ氦锛屾墍浠ラ璋变笂铏界劧閲嶈凯锛?