Multi carrier and spread spectrum systems phần 6 docx
Multi carrier and spread spectrum systems phần 6 docx
... 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 fre-
quency band has a bandwidth ... 3.1 dB 3 .6 dB 5.4 dB
2/3 4.9 dB 5.7 dB 8.4 dB
QPSK 3/4 5.9 dB 6. 8 dB 10.7 dB
5 /6 6.9 dB 8.0 dB 13.1 dB
7/8 7.7 dB 8.7 dB 16. 3 dB
1/2 8.8 dB 9 .6 dB 11.2 dB
2/3 11.1 dB 1...
Multi carrier and spread spectrum systems phần 2 docx
... 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 Transmission 25
serial data symbols
serial-
to-
parallel
converter
sub -carrier
f
0
sub -carrier
f
1
sub -carrier
f
N
c
−1
parallel ... 93.
[19] Fazel K. and Fettweis G. (eds), Multi- Carrier Spread- Spectrum. Boston: Kluwer Academic Publishers,
1997, Proc...
Multi carrier and spread spectrum systems phần 9 docx
... 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 ... infras-
tructure, required symmetrical or asymmetrical transmission capacity, and whether they
Multi- Carrier and Spread Spectrum Systems K. Fazel and S. Kaiser
2003...
Multi carrier and spread spectrum systems phần 3 ppsx
... spread spectrum communications,” Proceedings of the
IEEE, vol. 76, pp. 65 7 67 1, June 1988.
[35] Ormondroyd R.F., Lam W.K. and Davies J., “A multi- carrier spread spectrum approach to broadband
underwater ... generation for one user
Multi- Carrier Spread Spectrum 43
data symbols
spread data symbols
spreading code
serial-
to-
parallel
converter
01
•
L − 1
sub -carrier...
Multi carrier and spread spectrum systems phần 4 pdf
... sub-bands to avoid adjacent
Multi- Carrier and Spread Spectrum Systems K. Fazel and S. Kaiser
2003 John Wiley & Sons, Ltd ISBN: 0-470-84899-5
MC-CDMA 77
024
6
8 101214
16
18 20
E
b
/N
0
in dB
10
−5
10
−4
10
−3
10
−2
10
−1
10
0
BER
MRC
EGC
ZF
MMSE
MC-CDMA ... orthogonal multi- carrier CDMA in a multipath fading
channel,” IEEE Transactions on Communications, vol. 44,...
Multi carrier and spread spectrum systems phần 5 ppsx
... constellation and FEC scheme but also on the amount of reference
and pilot symbols spent to guarantee reliable synchronization and channel estimation.
Multi- Carrier and Spread Spectrum Systems K. Fazel and ... 67 9 69 1,
April 2000.
Multi- Carrier Modulation and Demodulation 121
Total channel bandwidth
Guard band
DC sub -carrier
(not used)
Unused sub-carriers
i.e.Vi...
Multi carrier and spread spectrum systems phần 7 ppsx
... performance of multi- carrier and
multi- carrier CDMA transmission with a high number of sub-carriers in the presence of
low cost oscillators with phase noise and HPAs with both AM/AM and AM/PM non-
linear ... E
b
/N
0
at
BER = 10
−9
(23,17)(31,25) 53 bytes 0.5 96 4.5 dB
( 16, 15) (64 ,57) 1 06 bytes 0.834 6. 2 dB
( 56, 49)(32, 26) 159 bytes 0.711 3.8 dB
(49,42)(32,31) 159 byte...
Multi carrier and spread spectrum systems phần 8 ppt
... −84 −79 −77 −72 −71
6 −85 −83 −78 − 76 −72 −70
7 −84 −82 −77 −75 −71 69
10 −83 −81 − 76 −74 69 68
12 −82 −80 −75 −73 69 67
14 −81 −79 −74 −72 68 66
20 −80 −78 −73 −71 66 65
214 Applications
Frame ... 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 4 192 96
16- QAM 3/4 4 192 144
64 -QAM 2/3 6 288 192
64 -QAM 3/4 6 288 2 16
Tabl e 5 -6...
Multi carrier and spread spectrum systems phần 10 pdf
... Broadband System
MC Multi- Carrier
MC-CDMA Multi- Carrier CDMA
MC-DS-CDMA Multi- Carrier DS-CDMA
MCM Multi- Carrier Modulation
MC-SS Multi- Carrier Spread Spectrum
MC-TDMA Multi- Carrier TDMA (OFDM and ... constellation 167 – 169
M&Q-Modification 74
Multiband radio 258
Multi- carrier CDMA (MC-CDMA)
8–10, 41–44, 49–83
Multi- carrier channel modeling 21–22
Mul...
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