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鍣伈姒傚康
鐗╃悊瀛�(xu茅)
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鍣伈鏄櫦(f膩)鑱查珨鍋氱劇瑕�(gu墨)鍓囨尟鍕�(d貌ng)鏅�(sh铆)鐧�(f膩)鍑虹殑鑱查煶銆�
鐢熺悊瀛�(xu茅)
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寰炵附楂旇瑳
鍣伈鐢辩墿楂旀尟鍕�(d貌ng)鐢�(ch菐n)鐢�銆�
閫氳▕闋�(l菒ng)鍩�
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鍠綅
dB(Decibel锛屽垎璨�) 鏄竴鍊�(g猫)绱旇▓(j矛)鏁�(sh霉)鍠綅锛屾湰鎰忔槸琛ㄧず鍏╁€�(g猫)閲忕殑姣斿€煎ぇ灏�锛屾矑鏈夊柈浣�銆�
鍦ㄥ伐绋嬫噳(y墨ng)鐢ㄤ腑缍�(j墨ng)?锛熷惞鐭彍鎾囩厡顑愪憨顭墄鏂瑰紡锛堝儏鍍呮槸鐪嬩笂鍘讳笉鍚岋級銆傚皪浜庡姛鐜�锛宒B = 10*lg(A/B)銆傚皪浜庨浕澹撴垨闆绘祦锛宒B = 20*lg(A/B)銆傛铏旳锛孊浠ｈ〃鍙冭垏姣旇純鐨勫姛鐜囧€兼垨鑰呴浕娴�銆侀浕澹撳€笺€�
dB鐨勬剰缇╁叾瀵�(sh铆)鍐嶇啊鍠笉閬庝簡锛屽氨鏄妸涓€鍊�(g猫)寰堝ぇ锛堝悗闈㈣窡涓€闀蜂覆0鐨勶級鎴栬€呭緢?銆傘剣鎳婂瑮骞稿L涓�0鐨勶級鐨勬暩(sh霉)姣旇純绨＄煭鍦拌〃绀哄嚭渚�銆傚锛堟铏曚互鍔熺巼鐐轰緥锛夛細
X = 100000 = 10^5
X(dB) = 10*lg(X) dB= 10*lg(10^5) dB= 50 dB
X 10鐨勮矤(f霉)15娆℃柟 = 10^-15
X(dB) = 10*log(X) dB= 10*log(10^-15) dB= -150 dB
涓€鑸締璎�锛屽湪宸ョ▼涓�锛宒B鍜宒B涔嬮枔鍙湁鍔犳笡锛屾矑鏈変箻闄�銆傝€岀敤寰楁渶澶氱殑鏄笡娉曪細dBm 娓� dBm 瀵�(sh铆)闅涗笂鏄叐鍊�(g猫)鍔熺巼鐩搁櫎锛屼俊铏�(h脿o)鍔熺巼鍜屽櫔鑱插姛鐜囩浉闄ゅ氨鏄俊鍣瘮锛圫NR锛�銆傛瘮濡傦細30dBm - 0dBm = 1000mW/1mW = 1000 = 30dB銆俤Bm 鍔� dBm 瀵�(sh铆)闅涗笂鏄叐鍊�(g猫)鍔熺巼鐩镐箻锛屾矑鏈夊(sh铆)闅涚殑鐗╃悊鎰忕京銆�
寤㈡埃姹℃煋浜嬩欢
姣斿埄鏅�(sh铆)棣柉娌宠胺浜嬩欢:
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缇庡湅澶氳鎷変簨浠�:
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鑻卞湅鍊暒鐨勭厵闇т簨浠�:
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缇庡湅鐨勬礇鏉夌／鍏夊寲瀛�(xu茅)鐓欓湩浜嬩欢:
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绠￠亾
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