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参数资料
| 型号： | STEL-2060CP |
| 英文描述： | VITERBI DECODER|QFP|100PIN|PLASTIC |
| 中文描述： | 维特比译码| QFP封装| 100引脚|塑料 |
| 文件页数： | 18/19页 |
| 文件大小： | 284K |
| 代理商： | STEL-2060CP |
STEL-2060C
18
QPSK Communication System Using Convolutional
Encoding and Viterbi Decoding. Rate =
1
/
2
APPLICATION INFORMATION
The STEL-2060C can be used in a variety of different
environments. One example of a system using a convolutional
encoder with the STEL-2060C Viterbi decoder is illustrated
here. The STEL-2060C cannot be used as a common decoder
in multi-channel applications because of the memory
incorporated on the chip which is dedicated to a single
channel.
The system modulates a data stream of rate 45 Mbps using
binary PSK (BPSK) or quaternary PSK (QPSK). To be able to
use convolutional coding, the system must either have
available the additional bandwidth needed to transmit
symbols at a higher rate or must be able to make use of higher
levels of modulation. e.g., by changing from BPSK to QPSK
modulation, the data can be encoded at Rate
1
/
2
without
requiring any additional bandwidth. The performance
improvement that can be expected is shown in the graph
below.
The STEL-2060C is designed to accept symbols
synchronously.
SYMCKIN
is supplied by the user to clock
in the symbols. The maximum data rate is 45 Mbps, using a
SYMCKIN
frequency of 45 MHz (when
PARL
is set high) or
90 MHz (when
PARL
is set low) at rate
1
/
2
, corresponding to
90 MSymbols per sec.
RATE 1/2
CONV.
ENCODER
QPSK
DEMOD.
RATE 1/2
VITERBI
DECODER
QPSK
MODULATOR
CHANNEL
BW=90 MHz
CODED DATA @ 90 Mbps
Tx DATA
45 Mbps
Rx DATA
45 Mbps
CODED DATA @ 90 Mbps
I
Q
I
Q
2
3
4
5
6
7
8
9
10
10
–2
10
–3
10
–4
10
–5
10
–6
10
–7
12
3
2
6
3
2
6
3
2
6
3
2
6
3
2
6
3
2
6
10
–1
11
E
b
/N
0
dB
BER
Uncoded
Coding Gain
Coded
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