Wireless địa phương vòng - lý thuyết và ứng dụng P10 pot
Wireless địa phương vòng - lý thuyết và ứng dụng P10 pot
... processor
baseband
processor
baseband
processor
Traffic
generator
AP
RF
RFRF
R-FR
CTL
CTL
CTL
T-FR
T-FR
T-FR
STA 2
STA 1
R-FR
R-FR
video TE
(MPEG II)
video TE
(MPEG II)
MAC&DLC
processor
baseband
processor
RF
CTL
T-FR
STA 3
R-FR
voice TE
(PCM)
MAC&DLC
processor
baseband
processor
RF
CTL
T-FR
STA ... TE
(PCM)
MAC&DLC
processor
baseband
processor
RF
CTL
T-FR
STA 5
R-FR
data TE
(LANE...
Wireless địa phương vòng - lý thuyết và ứng dụng P3 potx
... J., vol. 10, no. 5, pp. 229±235, Oct. 1998.
[19] `ATM Radio-in-the-Local-Loop (RL/A),' in Proceedings of the Wireless Broadband Commu-
nications Workshop, 1997, Brussels, Belgium, Sep. 29.
[20] ... point-to-point
link is formed between the stations (see Figure 3.8), so reducing the delay spread com-
pared to the one in case 3. Another advantage is the increase in coverage obtained from...
Wireless địa phương vòng - lý thuyết và ứng dụng P5 potx
... for in-building
wireless systems), home office (SOHO) and residential market with increasing commu-
nication needs. This is a cost sensitive market with voice being the primary communica-
tion ... Frenkiel and T. Imielinski, `Infostations: The Joy of ``Many-time, many-where'' Commu-
nications,' WINLAB Technical Report TR-119, Apr. 1996.
[4] D. Goodman, J. Boras, N. B. Mandaya...
Wireless địa phương vòng - lý thuyết và ứng dụng P1 ppt
... codec: 64 kbps PCM (ITU-T
G.711), 32 kbps ADPCM (ITU-T G.726), 16 kbps LD-CELP (ITU-T G.728), and
8 kbps conjugate structure algebraic-code-excited linear prediction (CS-ACELP, ITU-T
G.729). However, ... 1997.
[11] TIA/EIA/IS-95-A, Mobile Station-Base Station Compatibility Standard for Dual-Mode Wide-
band Spread Spectrum Cellular System, 1995.
[12] ANSI J-STD-008, Personal Station-Base Stati...
Wireless địa phương vòng - lý thuyết và ứng dụng P2 ppsx
... analogue to digital cellular, like AMPS, IS-95 CDMA and IS-136 TDMA
and low-tier PCS such as Cordless Telephone-2 (CT-2), Digital Enhanced Cordless Tele-
communications (DECT) to proprietary systems.
2.3 ... Models for Wireless Local Loops
Office
Wireless
Base station
Wireless
Base station
Local
Exchange
Local
Exchange
Inter-
Exchange
switching
Residential Houses
Figure 2.1 Configurati...
Wireless địa phương vòng - lý thuyết và ứng dụng P4 doc
... consideration, a computer simulation
based on Finite-Difference-Time Domain (FD-TD) [12] technique is adopted. The Finite-
difference-Time Domain (FD-TD) formulation is a convenient tool for solving
88 ... practical medium para-
meters. The performance analysis of the combined system is carried out through the
evaluation of signal-to-quantization noise ratio (SQNR) versus signal-to-noise rati...
Wireless địa phương vòng - lý thuyết và ứng dụng P6 ppt
... expected simply due to conventional path loss analysis. There-
fore, in many cases with the omni-directional antenna, a quasi-line-of-sight (QLOS)
existed in which a strong specular reflector lead ... ruggedized single-
mode fibre. Single-mode fibre has extremely low loss (0.02 dB/km) and low dispersion
for the frequency range of interest. A high-speed photo-detector converted the light-
wave...
Wireless địa phương vòng - lý thuyết và ứng dụng P7 pps
... between multiple wireless conversations
[10]. Its bandwidth is much wider than that required for simple point-to-point commu-
nications at the same data rate because it uses noise-like carrier waves ... Mobile Commu-
nications (GSM), and Personal Digital Cellular (PDC).
7.3.2 Code Division Multiple Access
CDMA is a form of spread-spectrum, an advanced digital wireless transmission tech-
n...
Wireless địa phương vòng - lý thuyết và ứng dụng P8 docx
... as co-channels. The co-channel re-use distance s denotes
the minimum distance for re-use of the channel with an acceptable level of interference. A
channel can be reused by a number of co-channels ... respective RNTs.
Broadcast-phase
signalling period
signalling period
fixed length
signalling period
Uplink-phase
transceiver
turn-around interval
time
Rand acc.
Downlink-phase
Figure 8.2 Structu...
Wireless địa phương vòng - lý thuyết và ứng dụng P9 pptx
... 9.4.
H
FS
H
BS,k
H
U,K
d
FS-BS,
A
d
FS-BS,
k
d
FS-U,k
d
FS-U,k
r
FS-BS,
k
r
FS-
U,k
r
BS,
A-BS,
k
r
FS-U,K
r
FS-BS,
A
q
FS-U,k
q
FS-BS,k
Main Lobe Axis
FS-ML
B-Cell
A-Cell
Tier of
cell 'B'
One
Sector
Coordinate
system ... asynchronous operation may be performed.
. Coherent spreading-code tracking.
. Fast transmit power control on both mobile-to-cell-site and cell-site-to-mobile link...
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