銆?/p>
-
鍙紪杈戜慨鏀?/p>
-
1.
鍦ㄦ棤澶辩湡鐨勪俊婧愪腑锛?/p>
淇℃簮杈撳嚭鐢?/p>
H
(
X
)
鏉ュ害閲忥紱
鍦ㄦ湁澶辩湡鐨勪俊婧愪腑锛?/p>
淇℃簮杈撳嚭鐢?/p>
R
(
D
)
鏉ュ害閲忋�?/p>
2.
瑕佷娇閫氫俊绯荤粺鍋氬埌浼犺緭淇℃伅鏈夋晥銆佸彲闈犲拰淇濆瘑锛屽繀椤婚鍏?/p>
淇℃簮
缂栫爜锛?/p>
鐒跺悗
_____
鍔犲瘑
____
缂栫爜锛屽啀
______
淇￠亾
_____
缂栫爜锛屾渶鍚庨�佸叆淇￠亾銆?/p>
3.
甯﹂檺
AWGN
娉㈠舰淇￠亾鍦ㄥ钩鍧囧姛鐜囧彈闄愭潯浠朵笅淇￠亾瀹归噺鐨勫熀鏈叕寮忥紝涔熷氨鏄湁鍚嶇殑棣欏啘鍏?/p>
寮忔槸
log(1
)
C
W
SNR
飥?/p>
飥?/p>
锛?/p>
褰撳綊涓�鍖栦俊閬撳閲?/p>
C/W
瓒嬭繎浜庨浂鏃讹紝
涔熷嵆淇￠亾瀹屽叏涓уけ浜嗛�氫俊
鑳藉姏锛屾鏃?/p>
E
b
/N
0
涓?/p>
-1.6
dB
锛屾垜浠皢瀹冪О浣滈鍐滈檺锛屾槸涓�鍒囩紪鐮佹柟寮忔墍鑳借揪鍒扮殑鐞嗚鏋?/p>
闄愩�?/p>
4.
淇濆瘑绯荤粺鐨勫瘑閽ラ噺瓒婂皬锛?/p>
瀵嗛挜鐔?/p>
H
(
K
)
灏辫秺
灏?/p>
锛?/p>
鍏跺瘑鏂囦腑鍚湁鐨勫叧浜庢槑鏂囩殑淇℃伅閲?/p>
I
(
M
锛?
C
)
灏辫秺
澶?/p>
銆?/p>
5.
宸茬煡
n
锛?/p>
7
鐨勫惊鐜爜
4
2
(
)
1
g
x
x
x
x
飥?/p>
飥?/p>
飥?/p>
飥?/p>
锛屽垯淇℃伅浣嶉暱搴?/p>
k
涓?/p>
3
锛屾牎楠屽椤瑰紡
h(x)
=
3
1
x
x
飥?/p>
飥?/p>
銆?/p>
6.
璁捐緭鍏ョ鍙疯〃涓?/p>
X
锛?/p>
{0
锛?/p>
1}
锛?/p>
杈撳嚭绗﹀彿琛ㄤ负
Y
锛?/p>
{0
锛?/p>
1}
銆?/p>
杈撳叆淇″彿鐨勬鐜囧垎甯冧负
p
锛?/p>
(1/2
锛?/p>
1/2)
锛屽け鐪熷嚱鏁颁负
d
(0
锛?/p>
0) =
d
(1
锛?/p>
1) = 0
锛?/p>
d
(0
锛?/p>
1) =2
锛?/p>
d
(1
锛?/p>
0) = 1
锛屽垯
D
min
锛?/p>
0
锛?
R
(
D
min
)
锛?/p>
1bit/symbol
锛岀浉搴旂殑缂栫爜鍣ㄨ浆绉绘鐜囩煩闃?/p>
[
p(y/x
)]
锛?/p>
1
0
0
1
飪?/p>
飪?
飪?/p>
飪?/p>
飪?/p>
飪?
锛?/p>
D
max
锛?/p>
0.5
锛?/p>
R
(
D
max
)
锛?/p>
0
锛岀浉搴旂殑缂栫爜鍣ㄨ浆绉绘鐜囩煩闃?/p>
[
p(y/x
)]
锛?/p>
1
0
1
0
飪?/p>
飪?
飪?
飪?/p>
飪?/p>
飪?
銆?/p>
7.
宸茬煡鐢ㄦ埛
A
鐨?/p>
RSA
鍏紑瀵嗛挜
(
e,n
)=(3,55)
锛?/p>
5,
11
p
q
飥?/p>
飥?/p>
,
鍒?/p>
(
)
飦?/p>
n
飥?/p>
40
锛?/p>
浠栫殑绉?/p>
瀵嗗瘑閽?/p>
(
d,n
)
锛?/p>
(27,55)
銆傝嫢鐢ㄦ埛
B
鍚戠敤鎴?/p>
A
鍙戦�?/p>
m
=2
鐨勫姞瀵嗘秷鎭紝鍒欒鍔犲瘑鍚庣殑娑堟伅涓?/p>
8
銆?/p>
浜屻�佸垽鏂
1.
鍙互鐢ㄥ厠鍔冲か鐗逛笉绛夊紡浣滀负鍞竴鍙瘧鐮佸瓨鍦ㄧ殑鍒ゆ嵁銆?/p>
锛?/p>
飪?/p>
锛?/p>
2.
绾挎�х爜涓�瀹氬寘鍚叏闆剁爜銆?/p>
锛?/p>
飪?/p>
锛?/p>
3.
绠楁湳缂栫爜鏄竴绉嶆棤澶辩湡鐨勫垎缁勪俊婧愮紪鐮侊紝鍏跺熀鏈�濇兂鏄皢涓�瀹氱簿搴︽暟鍊间綔涓哄簭鍒楃殑
缂栫爜锛屾槸浠ュ彟澶栦竴绉嶅舰寮忓疄鐜扮殑鏈�浣崇粺璁″尮閰嶇紪鐮併�?/p>
锛埫楋級
4.
鏌愪竴淇℃簮锛屼笉绠″畠鏄惁杈撳嚭绗﹀彿锛屽彧瑕佽繖浜涚鍙峰叿鏈夋煇浜涙鐜囩壒鎬э紝灏辨湁淇℃伅閲忋�?/p>
锛埫楋級
5.
绂绘暎骞崇ǔ鏈夎蹇嗕俊婧愮鍙峰簭鍒楃殑骞冲潎绗﹀彿鐔甸殢鐫�搴忓垪闀垮害
L
鐨勫澶ц�屽澶с�?/p>
锛埫楋級
6.
闄愬钩鍧囧姛鐜囨渶澶х喌瀹氱悊鎸囧嚭瀵逛簬鐩稿叧鐭╅樀涓�瀹氱殑闅忔満鐭㈤噺
X
锛屽綋瀹冩槸姝ｆ�佸垎甯冩椂鍏?/p>
鏈夋渶澶х喌銆?/p>
锛?/p>
飪?/p>
锛?/p>
7.
寰幆鐮佺殑鐮侀泦涓殑浠讳綍涓�涓爜瀛楃殑寰幆绉讳綅浠嶆槸鐮佸瓧銆?/p>
锛?/p>
飪?/p>
锛?/p>
8.
淇￠亾瀹归噺鏄俊閬撲腑鑳藉浼犺緭鐨勬渶灏忎俊鎭噺銆?/p>
锛埫楋級
9.
棣欏啘淇℃簮缂栫爜鏂规硶鍦ㄨ繘琛岀紪鐮佹椂涓嶉渶瑕侀鍏堣绠楁瘡涓爜瀛楃殑闀垮害銆?/p>
锛埫楋級
10.
鍦ㄥ凡鐭ユ敹鐮?/p>
R
鐨勬潯浠朵笅鎵惧嚭鍙兘鎬ф渶澶х殑鍙戠爜
i
C
浣滀负璇戠爜浼拌鍊硷紝杩欑璇戠爜鏂?/p>
娉曞彨鍋氭渶浣宠瘧鐮併�?/p>
锛?/p>
飪?/p>
锛?/p>