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1、2002CopyrightEELab508?H.F.第二章第二章單符號(hào)離散信道單符號(hào)離散信道2.1設(shè)信源通過(guò)一信道,信道的輸出隨機(jī)變量Y的符號(hào)集.30.70)(X:][X21????XPaaP信道的矩陣::21bbY???????43416165][2121aaPbb試求:(1)信源X中的符號(hào)?1和?2分別含有的自信息量;(2)收到消息Y=b1,Y=b2后,獲得關(guān)于?1、?2的互交信息量:I(?1b1)、I(?1b2)、I(?2b1)、
2、I(?2b2);(3)信源X和信宿Y的信息熵;(4)信道疑義度H(XY)和噪聲熵H(YX);(5)接收到消息Y后獲得的平均互交信息量I(XY)。解:bitsymble228.0698.0926.0)()()5(symblebit653.0926.0698.0881.0)()()()()()()()(bitsymble698.0)(log)()()(log)()()4(bitsymble926.0)12041log1204112079lo
3、g12079()(log)()(bitsymble881.0)3.0log3.07.0log7.0()(log)()(12041)()()(12079)()()(:)3(134.1433.0617.043log)()(log)(I766.0413.0657.041log)()(log)(I036.1433.0617.061log)()(log)(I34.0413.0657.065log)()(log)(I)2(737.13.0log)(
4、log)(I5415.07.0log)(log)(I(1)212121212121212221112222212112212211111121211??????????????????????????????????????????????????????????????????????????????????????????XYHYHI(XY)YHXYHXHYXHYXHXHXYHYHI(XY)abpabpapabpbapXYHbpbp
5、YHapapXHabpapbpabpapbpbitbpabpbabitbpabpbabitbpabpbabitbpabpbabitapabitapajiijijijiijjijjjiiiiiiiii又由上2002CopyrightEELab508?H.F.??????bitsymble0)8181log818383log838383log838181log81())11()111(log)111()10()100(log)100()01
6、()010(log)010()00()000(log)000(()()(log)()(log)()(bitsymble406.0)()(bitsymble406.0)8181log812183log838383log832181log81())11()111(log)111()00()100(log)100()10()010(log)010()00()000(log)000(()()(log)()(log)()(0)110()011()
7、101()001(bitsymble4060)()(bitsymble8620)()(:、、、Z、Y、X、bitsymble4060)2181log812183log8302121log21()11(log)11()01(log)10()10(log)01()00(log)00()()(log)()(log)()(bitsymble8620)8181log818783log8308721log21()11(log)11()01(log)
8、10()10(log)01()00(log)00()()(log)()(log)()(:、、bitsymble8110)()()()()()()()()(bitsymble8110)41log8143log8343log8341log81()11(log)11()01(log)10()10(log)01()00(log)00()(log)()(412181)1()11()11(432183)1()01()10(432183)0()10(
9、)01(412181)0()00()00()00(221212121212121212121212121212121212121212121ppppppppppppyxpzyxpzyxpyxzpzyxpXYZHYZXHXZYHppppppppppppzypzyxpzyxpzyxpzyxpYZXHpppp.XZHYZH.ZXHZYH.ppppppppxpxzpxzpxzpxzpXZH.ppppppppzpzxpzxpzxpzxpZXH.Y
10、XHXYHYHX且HXYHYHYXHXHXYI.ppppppppyxpyxpYXH.ppppppppppppYX)p(xyxyzxyzxyxyzxyzxyxyzxyzxyxyzxyzjikjiijkkjijikijkkjiyzxyzxyzyzxyzxyzyzxyzxyzyzxyzxyzkjkjiijkkjikjiijkkjixyzxyzxyzxyzzxzxzxzxzxzxzxzxkiiikikkiikikxzxzxzxzxzxzxzxz
11、ikkkikiikkikixyxyxyxyxyxyxyxyijjijiyxyxyyxyxyyxyxyyxyxy?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
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