2.14

2.14(1)S(t)

A.S(t-t0)

(2.169)A(2)10PN(CDMA)(DSSS)2G3G CDMAmGold

x(t)()h(t)2.14

2.14

x(t)

x(t)(2.171)

(2.174)h(t)

2.15 ,(ISI)IsIISI

2.15

{ }{ }{ }{ }2.152N+1 TN,(2N+1) { }

2.178 2.16

2.16

2.162N2N+1

2.179

2.17

2.17

(2.180)

(2.181) ,h(t) (2.182)

, (2.183) (2.184) h(k) MSE

ISIFree):M ,

X(t) X(t ){ }m X(t) (2.185)

(2.186)

m m m (2.187)

(2.188)

X(0)=1

(2.189)

2.15.1 ()Lucky1965 N(

(2.190)

(2.191)

(2.178)2N+12.16C(z) z

,F(z)h(t)z

2.16C(z)F(z)

AWGN()

{ }{ }{ }

2.18

(2.193)

D k=0D=0,

,

2.15.2 (MSE)2.19FIR

2.19 FIRX(n)d(n)

{ } MSEJ

(2.181)2N+1{ }MSE 1 2 n = n+ 1

2.15.3 () MSE RLS (){ } (2.181)

{ }ISI() 1975

2.15.4

TGSM()16usISI270kbit/sT=3.7us5(N=2)TDMA60usISI24kbit/sT=40us3(N=1)2N+12NT