User Manual

Table Of Contents
Unframed transmission
11-22 Confidential - For internal use 99-137719-D
11.9 Unframed transmission
The BGAN XL Radio Module offers the capability to transmit a modulated carrier
(without framing) manually. This functionality can be achieved in ‘service’ mode.
The integrator must be aware that the unframed transmission allows combinations of
symbol rate and modulation type which are not supported by the SDM. In these
scenarios the roll-off factor of the channel filter is linked to the symbol rate such that
carriers with symbols rates of 16800, 33600, 67200 and 151200 S/s are filtered with a
roll-off factor of 0.25, whereas carriers with symbol rates of 84000 and 168000 S/s are
filtered with a roll-off factor of 0.13.
11.9.1 Integrator’s interface
Functionality Tx Cont (/txcont/)
Actions start, stop
States Idle, Transmitting Unframed
Modes supported Service
Blocks functionality Yes, blocks CW and BGAN transmission.
Example: Start unframed transmission at 1546 MHz, backoff: 3.25 dB, symbolrate:
151200 S/s and modulation: 32-QAM
.../intif/txcont/start?freq=1546000000&backoff=3.25&modulation=X32&symbolrate=1512
00
Example: Stop unframed transmission
.../intif/txcont/stop
Parameter Name Valid Values Mandatory Default
Frequency (Hz) freq 1518000000..1700000000 (in steps
of 1 Hz)
Yes N/A
EIRP backoff backoff 0.00..10.00 (in steps of 0.01 dB) No 0
Symbol Rate symbolrate 16800, 33600, 67200, 84000,
151200, 168000
No 168000
Modulation modulation Q, X4, X16, X32, X64
Q: pi/4-QPSK
X4: QPSK
X16: 16-QAM
X32: 32-QAM
X64: 64-QAM
Yes
Table 11-6: Parameter overview for Unframed transmission