Table 1-2. Ber Performance Specifications - Comtech EF Data SDM-650B Installation And Operation Manual

SDM-650B Satellite Modem
The specifications for the Bit Energy-to-Noise Ratio (E
10 BER for different coding configurations is listed in Table 1-2. All values are for
-7
operation in QPSK mode.
100 kbit/s
1544 kbit/s
Without coding, the modem provides operation within 0.5 dB of theoretical for BPSK,
and within 0.8 dB for QPSK.
Performance measurements are with transmit, and receive IF connected back-to-back
through an additive white Gaussian noise channel.
BER performances of the modem are shown in Figures 1-4 through 1-7.
A typical output spectrum of the modem is shown in Figure 1-8.
Rev. 5

Table 1-2. BER Performance Specifications

Data Rate
1/2 Rate
BER 10 4.8 dB
-5
BER 10 5.8 dB
-7
BER 10 5.8 dB
-5
BER 10 6.6 dB
-7
Sequential
3/4 rate 7/8 Rate
5.8 dB 6.7 dB 5.5 dB
6.6 dB 8.0 dB 6.7 dB
6.3 dB 6.9 dB 5.5 dB
7.1 dB 8.0 dB 6.7 dB
/N ) required to achieve 10
b 0
Viterbi K=7
1/2 Rate
Introduction
and
-5
1–7