B-AMC (Broadband Aeronautical Multi-carrier Communication)
B-AMC stands for Broadband Aeronautical Multi-carrier Communication. It is proposed technology for L-DACS (L-band digital aeronautical communication system). It is based on VHF frequency and similar to MC-CDMA concepts.
B-AMC spectrum lies n between two DME channels of 1MHz bandwidth each. B-AMC has spectrum bandwidth of 500KHz. All the specifications for the proposed syste are summerized below in the table. It uses OFDM modulation technique. Forward link is used for transmissions from Ground Staion to the Aircraft Stations while Reverse link is used for transmissions from Aircraft stations to the Ground Staion.
| Specifications | B-AMC support |
|---|---|
| Effective bandwidth | 500KHz for both forward and reverse link |
| Subcarrier spacing | 10.416KHz |
| Used subcarrier | 48 total |
| FFT/DFT size | 64 |
| Sampling interval | 1.5 µS |
| Sampling frequency | 666.6KHz |
| OFDM symbol duration | 96µS |
| Cyclic prerix | 24µS |
| Total OFDM symbol duration | 120 µS |
| Number of OFDM symbols per frame | 54 |
| Data OFDM symbols per frame | 48 in the forward link and 50 in the reverse link |
| OFDM frame duration | 6.48ms |
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