RACOM RipEX 1.5, Руководство пользователя

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4.4.1. Detailed Radio parameters
The very first parameter which is often required for consideration is the receiver sensitivity. Anyone
interested in the wireless data transmission probably aware what this parameter means, but we should
regard it simultaneously in its relation to other receiver parameters, especially blocking and desensitiz-
ation. Today’s wireless communication arena tends to be overcrowded and a modern radio modem,
which is demanded to compete with others in that environment, should have good dynamic range that
is defined by the parameters listed above. Receiver of a radio modem, which is designed purely for
optimum sensitivity, will not be able to give proper performance. However, the main receiver parameters
determining its dynamic range go against each other and a clear trade-off between the sensitivity and
the blocking is therefore an essential assumption. Then, from the viewpoint of a logical comparison,
the consequence of better receiver sensitivity can be easily seen – a lower power level of the blocking
and degradation parameters generally.
Blocking or desensitization values were determined according to the standards EN 300 113-2 V1.5.1,
resp. EN 300 113-1 V1.7.1 (channels 25 and 12.5 kHz) and ETSI 301 166-1 V1.3.2 (channel 6.25 kHz)
respectively.
Tab. 4.8: CE 25 kHz
CE 25 kHz
Blocking or
desensitization [dBm] Sensitivity [dBm] Classification
±10 MHz ±5 MHz ±1 MHz BER 10
-6
BER 10
-3
BER 10
-2
Emission Modulation FEC kbps
-5 -6 -8 -111 -115 -118 13K8F1DCN 2CPFSK 0.75 7.81
-7 -8 -10 -110 -114 -117 13K8F1DBN 2CPFSK 1.00 10.42
-7 -9 -9 -107 -112 -115 14K2F1DDN 4CPFSK 0.75 15.63
-9 -11 -11 -104 -110 -113 14K2F1DDN 4CPFSK 1.00 20.83
-5 -6 -6 -107 -112 -114 24K0G1DCN DPSK 0.75 15.62
-7 -8 -8 -106 -111 -113 24K0G1DBN DPSK 1.00 20.83
-3 -4 -4 -106 -110 -113 24K0G1DDN π/4-DQPSK 0.75 31.25
-5 -6 -6 -104 -108 -111 24K0G1DDN π/4-DQPSK 1.00 41.66
-8 -8 -8 -98 -103 -106 24K0G1DEN D8PSK 0.75 46.87
-9.5 -10 -10 -95 -101 -104 24K0G1DEN D8PSK 1.00 62.49
-5 -6 -6 -95 -101 -104 24K0D1DEN 16DEQAM 0.75 62.49
-7 -8 -8 -93 -99 -102 24K0D1DEN 16DEQAM 1.00 83.32
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