Trango Systems, Inc. GigaPlus User Manual Rev 3.1 28
Industry Leading System Gain
The combination of the High Transmit power and superb receive sensitivity of the ODU
provide for one of the highest system gains available on the market today.
The technology behind the high system gain relates to the Low Density Parity Check
(LDPC) forward error correction (FEC) coding that was implemented in the GigaPlus
design.
The Figure below shows how the Low Density Parity Check (LDPC) coding, which
replaces the older Reed-Solomon lock coding, reduces the signal to noise ratio required
to achieve a 1E-6 Bit Error Rate (BER). As a result, the receive sensitivity is lowered by
the same amount, typically 3 to 4 dB.
Figure 8 LDPC vs. Reed-Solomon
System gain is one of the most important metrics for a microwave system because it has
a direct relationship to the link reliability, antenna size, and transmission distance as
shown in the figure below.
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