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LDACS1 vs. LDACS2: Key Differences Explained

By RF Wireless Expert Team

This article breaks down the differences between LDACS1 and LDACS2, both variations of the L-band Digital Aeronautical Communication System (LDACS). LDACS serves as a critical communication link between Aircraft Stations (ASs) and Ground Stations (GS), aiming to enhance Air Traffic Management.

Here’s a table summarizing the core distinctions:

SpecificationLDACS1LDACS2
ModulationBroadband system based on OFDM; combining B-AMC and P34Narrowband system based on single-carrier technology (GMSK); combining LDL and AMACS
Duplexing SchemeFDDTDD
Capacity (Data Rate)Forward link: 291 kbps to 1.3 Mbps
Reverse link: 220 kbps to 1.04 Mbps		270.833 kbit/s per channel
Frequency of Operation960 to 1164 MHz960-975 MHz
Maximum Coverage Range200 nm200 nm
Effective RF Channel Bandwidth498.05 KHz200 kHz for a single channel
Frame Structure
Physical Layer

To truly grasp the difference between LDACS1 and LDACS2, diving into their physical layer implementations and frame structures is essential. More details are available in the resources linked below.

LDACS (L Band Digital Aeronautical Communication System)

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