Digital Television Techniquies Coded Orthogonal Frequency Division
Báo cáo hóa học: " High-Speed Turbo-TCM-Coded Orthogonal Frequency-Division Multiplexing Ultra-Wideband Systems" pptx
... coded bits are read in columnwise
andreadoutrowwise.
Yanxia Wang et al. 11
10
−2
10
−1
10
0
PER
0 2 4 6 8 1012141618
E
b
/N
0
(dB)
AWGN -coded 16-QAM
AWGN-uncoded QPSK
UWB -coded 16-QAM
UWB-uncoded ... Mbps
coded OFDM system and uncoded case over UWB and
AWGN channels. The low PER of 0.036 is obtained at
E
b
/N
0
= 6.7dB for coded OFDM over 10m UWB chan-
nels.
The BER performance for...
AN IMPROVED INTERPOLATION METHOD FOR CHANNEL ESTIMATION IN AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM) SYSTEM USING PILOT SIGNALS
... back to the multiplication in frequency domain. This concept is true in
Guard
interval
OFDM symbol
16
Time Division Multiplexing Access (TDMA), Frequency Division
Multiplexing Access ...
channel conditions.
AN IMPROVED INTERPOLATION METHOD FOR CHANNEL ESTIMATION IN
AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM)
SYSTEM USING PILOT SIGNALS...
Orthogonal Frequency Division Multiplexing - Phân chia tần số trực giao potx
... Communications
OFDM
• Signal processing made digitally in the frequency domain
– IFFT/FFT –pair
• Guard time is added to reduce effects caused by
multipath propagation
• Tolerant to frequency- selective fading
– ... Pietikäinen
Communications Laboratory / HUT
S-72.333 Postgraduate Course in Radio Communications
Orthogonal Frequency Division Multiplexing
Kari Pietikäinen
kari.pietikai...
56 Digital Television
... between the input HDTV signal and the ACTV-I signal are digitally
coded using 4-band subband coding. The digitally coded video difference signal and digital audio
signal require a total bandwidth of ... adopted this method to
overcome the multipath problem [9]. A very different approach Coded Orthogonal Frequency
Division Multiplexing (COFDM)— has been advocated in Europe for ter...
Real-Time Digital Signal Processing - Chapter 4: Frequency Analysis
... time-domain signal x(n)
158
FREQUENCY ANALYSIS
4
Frequency Analysis
Frequency analysis of any given signal involves the transformation of a time-domain
signal into its frequency components. The ... amplitude gain at frequency !
0
and f!
0
is the phase shift
of the system at frequency !
0
. Therefore it is clear that the sinusoidal steady-state
response has the same frequency...
Digital Television Applications P1
... for Digital Television …………………… …………………… 84
6 Decoding of DVB Digital Television subtitles…………………… ………………… 91
7 Integration of Applications into Digital Television Environment…… ……………… 97
8 Digital ... little or no
effect on a digital signal as digital television receives high quality signals as binary coded
data at the receiver with little loss of information.
Di...
Digital Television Applications P2
... Applications
19
2.5 S
UBTITLES
Digital television subtitle services do not belong to the category of interactive applications,
however digital television uses a new digital subtitling system, which ... components of a digital television graphical user interface include video and
audio; subtitles; interactive service graphics; animation and large amounts of text.
Consequ...
Báo cáo hóa học: "Research Article Block Interleaved Frequency Division " ppt
... the chunk resources, so-called frequency- adaptive
(FA) transmission [9]. Adaptive Orthogonal Frequency
Division Multiple Access (OFDMA) with a chunk-based
Time Division Multiple Access (TDMA) ... equidistantly frequency- separated
blocks, each consisting of a few subcarriers, are allocated
to each user. A Discrete Fourier Transform (DFT) pre-
coding step is performed on each Ortho...
Báo cáo hóa học: " Research Article Practical Quantize-and-Forward Schemes for the Frequency Division Relay Channel" potx
... w
rd
(n),
(2)
where the notation is defined above. Orthogonality between
the received cooperation signal y
rd
and direct signal y
sd
can
be implemented by frequency division (FD). The optimal
bandwidth allocation ... in this paper are quasistatic
orthogonal relay channels for which orthogonality is defined
accordingly to [1]. Since the source-destination channel is
assumed to be orthogon...
personalized digital television targeting programs to individual viewers
... 331^370.
Cotter, P. and Smyth, B.: 2000, A Personalized Television Listing Service. Communications of
the ACM, 43(8), 107^111.
DVB (2000). Digital video broadcasting. http://www.dvb.org.
Eurisko ... e-commerce, tourism and digital libraries (Resnick and Varian, 1997; Riecken,
2000; Mostafa, 2002), several e¡orts have been recently made to apply this technology
to the Digital TV...
Từ khóa:
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