教材勘误
- 格式:doc
- 大小:162.00 KB
- 文档页数:4
Errata
Ch 2
On page 50 2.11 Varrall G is (1998), as on page 75, and not 1993 as typed here!
At some point the square root signs on Fig. 2.38 have been omitted: should be:
a
0101000110011101
0100000010001100
0110001010101110
0111001110111111
a2
a10
a18
eq (2.27), p. 31 Hf should be Hf2
It would be better to use exp(-jwct) as the complex form of the carrier. Then (2.7):
atRebtexpjctRebtcosctjsinct
Reb
ptcosctbqtsinctjbptsinctbqtcosc
t
b
ptcosctbqtsinc
t
(2.8):
atRebtexpjct
1
2
btexpjctbtexpjct
complex conjugate
(2.9):
A12btexpjctbtexpjct
expjtdt
1
2
btexpjctdtb*texpj
c
tdt
12Bc
B
c
noting that:
b*texpj
ctdtbtexpjctdt*B*c
Ch 3
Equation (3.12), p. 65, should be:
y
1
cos21tdt0T'1'
cos0tcos1tdt0T'0'
1
2
1cos21tdt0T'1'
1
2
cos10tcos10tdt0T'0'
T2'1'
T
2
sin
10
T
1
0
T
'0'
Prob 3.2, p 75. 221xxr should be xx21x2
Fig. 3.23 is a bit misleading. Would be better as:
2T
and with caption marked as h = 1.5 in this example
A simpler and more useful version of eq (3.16) normalises the result so that the peak p.s.d
is unity:
Gf
cos2fT
14fT
2
Problem 5.8 (p 139), does not give the noise standard deviation, which is required.
Suggest:
5.8. For the code illustrated in Fig. 5.12, the received symbol amplitudes are –0.11, -
0.21, 1.34. Find the log-likelihood ratios between the codeword 000 and each of
the other three codewords, for both hard and soft decision decoding (the latter
assuming a Gaussian noise channel with unit standard deviation and no
attenuation). Find also for soft decision decoding the log-likelihood ratio of each
bit.
Equation (5.43), p. 137, should be:
d
j
2dHjSN2dHjkEbTnN02T2d
Hj
kn2E
b
N
0
(5.43)
Ch 9
p 268 Caption for Fig 9.24 appears to be incomplete. Should be:
Figure 9.24. Filter responses for DFE for channel of Fig. 9.18, optimised for N0 = (a)
0, (b) 0.1 and (c) 5
Appendix 2
p. 347, l2 Inline equation should read Pdk1Pdk012
p. 348 sect A2.2 1. 1st bullet point should be "Calculate the four values of from the
received signal using (A2.9)"