Multi carrier and spread spectrum systems phần 2 docx
Multi carrier and spread spectrum systems phần 2 docx
... −3 0 2. 5 0 0
2 0.1 −4 0 .2 0 0.3 0 0.1 −1.5
3 0 .2 −8 0.5 2 1.0 −3 0.3 −4.5
4 0.3 − 12 1.6 −6 1.6 −5 0.5 −7.5
5 0.4 −16 2. 3 −8 5.0 2 15.0 −8.0
6 0.5 20 5.0 −10 6.6 −4 17 .2 −17.7
Multi- Carrier ... 1-8(b).
Spread Spectrum Techniques 31
Table 1 -2 Broadcasting standards DAB and DVB-T
Parameter DAB DVB-T
Bandwidth 1.5 MHz 8MHz
Number of
sub-carriers N
c
1 92
(25 6 FFT)
38...
Multi carrier and spread spectrum systems phần 6 docx
... 16.3 dB
1 /2 8.8 dB 9.6 dB 11 .2 dB
2/ 3 11.1 dB 11.6 dB 14 .2 dB
16-QAM 3/4 12. 5 dB 13.0 dB 16.7 dB
5/6 13.5 dB 14.4 dB 19.3 dB
7/8 13.9 dB 15.0 dB 22 .8 dB
1 /2 14.4 dB 14.7 dB 16.0 dB
2/ 3 16.5 dB ... in multi- carrier systems is shown. To evaluate and optimize the channel estimation,
a multi- carrier reference scenario typical for mobile radio systems is defined. The fr...
Multi carrier and spread spectrum systems phần 9 docx
... T
s
T
G
= 1/ 32 T
s
α = 0 .25
1 /2 0.66 0.69 0.83
QPSK
3/4 0.99 1.03 1 .25
1 /2 1. 32 1.37 1.67
Channel spacing 1 16-QAM
3/4 1.98 2. 06 2. 50
1 /2 1.98 2. 06 2. 50
64-QAM
3/4 2. 97 3.09 3.75
1 /2 2.63 2. 75 3.33
QPSK
3/4 ... symbols
Sub -carrier
spacing 1
Sub -carrier
spacing 2
Sub -carrier
spacing 3
Rectangular 187 0 .20 944 s 0.104 72 s 0.0 523 6 s
Nyquist w/o FH 195 0 ....
Multi carrier and spread spectrum systems phần 3 ppsx
... and Practical Guide. Indianapolis: SAMS,
20 02.
[27 ] IEEE 8 02. 16ab-01/01, “Air interface for fixed broadband wireless access systems – Part A: Systems
between 2 and 11 GHz,” IEEE 8 02. 16, June 20 00.
[28 ] ... −1)
1
L
L−1
l=0
|G
l,l
H
l,l
|
2
−
1
L
L−1
l=0
G
l,l
H
l,l
2
+
σ
2
2
L−1
l=0
|G
l,l
|
2
w
(k)
. (2. 81)
When MMSE equalization is use...
Multi carrier and spread spectrum systems phần 4 pdf
... (ISSSTA
20 02) , Prague, Czech Republic, pp. 118– 122 , Sept. 20 02.
[39] Popovic B.M., “Spreading sequences for multicarrier CDMA systems, ” IEEE Transactions on Communi-
cations, vol. 47, pp. 918– 926 , ... sub-bands to avoid adjacent
Multi- Carrier and Spread Spectrum Systems K. Fazel and S. Kaiser
20 03 John Wiley & Sons, Ltd ISBN: 0-470-84899-5
MC-CDMA 77
024
6...
Multi carrier and spread spectrum systems phần 5 ppsx
... 679–691,
April 20 00.
Multi- Carrier Modulation and Demodulation 121
Total channel bandwidth
Guard band
DC sub -carrier
(not used)
Unused sub-carriers
i.e.Virtual sub-carriers
Guard band
Unused sub-carriers
i.e.Virtual ... sin(π l)
r(2l +1) = I(2l + 1) cos(π(2l + 1) /2) + Q(2l +1) sin(π(2l +1) /2) (4.14)
It is straightforward to show that the desired output I and Q components are re...
Multi carrier and spread spectrum systems phần 7 ppsx
... 178 Implementation Issues
20 21 22
10
−5
10
−4
10
−3
10
2
10
−1
10
0
23
BER
24
E
b
/N
0
in dB
25 26 27
phase noise without correction
phase noise with correction
without ... E
b
/N
0
at
BER = 10
−9
(23 ,17)(31 ,25 ) 53 bytes 0.596 4.5 dB
(16,15)(64,57) 106 bytes 0.834 6 .2 dB
(56,49)( 32, 26) 159 bytes 0.711 3.8 dB
(49, 42) ( 32, 31) 159 bytes 0. 827 6.5 dB
(43, 42) ( 32, 31)...
Multi carrier and spread spectrum systems phần 8 ppt
... symbol
BPSK 1 /2 1 48 24
BPSK 3/4 1 48 36
QPSK 1 /2 2 96 48
QPSK 3/4 2 96 72
16-QAM 1 /2 4 1 92 96
16-QAM 3/4 4 1 92 144
64-QAM 2/ 3 6 28 8 1 92
64-QAM 3/4 6 28 8 21 6
Tabl e 5-6 Data rates of IEEE 8 02. 11a
PHY ... T
s
(µs) T
g
(µs)
1.75 128 4 8 16 32
3.5 64 2 4 8 16
7 32 1 2 4 8
14 16 1 /2 1 2 4
28 8 1/4 1 /2 1 2
Cellular Mobile Communications Beyond 3G 199
5 .2....
Multi carrier and spread spectrum systems phần 10 pdf
... characteristics 20 6
FEC coding and modulation
20 8 20 9
Link budget 20 9 21 0
MAC frame structure 20 6 20 7
IEEE 8 02. 11b 4
IEEE 8 02. 16a 32, 197, 21 0 22 0
FEC coding and modulation
21 6 22 0
Link budget 22 1
MAC ... model 20
HIPERLAN /2 4, 7, 31, 197, 20 5 20 9
Channel model/characteristics 21 ,
20 6
FEC coding and modulation
20 8 20 9
Link budget 20 9 21 0
MAC frame...
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