Overlapped TDM/TDMA satellite return communications

1. A system comprising:

a satellite communications gateway that includes:

a first receiver including a first processor and a first memory, the first memory including first instructions such that the first processor is programmed to:

receive a first signal including a time-division multiplexed (TDM) return and a time-division multiple access (TDMA) return overlapped in an allocated frequency range;

recover the time-division multiplexed return from the first signal;

reduce a sample rate of the first signal by a first down-sample factor prior to recovery of the time-division multiplexed return;

output the time-division multiplexed return;

cancel the time-division multiplexed return in the first signal to generate a second signal;

reduce the sample rate of the first signal by a second down-sample factor prior to cancelling the time-division multiplexed return in the first signal to generate the second signal; and

output the second signal to a second receiver.

2. The system of claim 1 , further comprising the second receiver, wherein:

the second receiver includes a second processor and a second memory, the second memory including second instructions such that the second processor is programmed to:

recover the time-division multiple access return from the second signal, and

output the time-division multiple access return.

3. The system of claim 1 , wherein cancelling the time-division multiplexed return in the first signal to generate the second signal includes:

remodulating the TDM return after recovery.

4. The system of claim 3 , wherein cancelling the time-division multiplexed return in the first signal to generate the second signal includes:

subtracting the remodulated TDM return from the first signal.

5. The system of claim 3 , wherein cancelling the time-division multiplexed return in the first signal to generate the second signal includes:

delaying the first signal to synchronize the first signal with the remodulated TDM return.

6. The system of claim 1 , wherein the first processor is further programmed to:

increase a sample rate of the second signal prior to outputting the second signal to the second receiver.

7. The system of claim 1 , comprising:

a first terminal enabled for both time-division multiplexed returns and time-division multiple access returns; and

a second terminal enabled for time-division multiple access returns and not enabled for time-division multiplexed returns; wherein the time-division multiplexed returns are received from the first terminal and the time-division multiple access returns are received from the second terminal.

8. The system of claim 7 , wherein the first terminal is a mobile terminal and the second terminal is a stationary terminal.

9. The system of claim 7 , wherein the first terminal includes a third processor and a third memory, the third memory including third instructions such that the first terminal is programmed to:

initiate communications with the satellite communications gateway based on time-division multiple access returns; and

switch to communications based on time-division multiplexed returns based on instructions received from the satellite communications gateway.

10. A method comprising:

receiving, in a first receiver, a first signal including a time-division multiplexed (TDM) return and a time-division multiple access (TDMA) return overlapped in an allocated frequency range;

recovering the time-division multiplexed return from the first signal;

reducing a sample rate of the first signal by a first down-sample factor prior to recovery of the time-division multiplexed return;

outputting the time-division multiplexed return;

cancelling the time-division multiplexed return in the first signal to generate a second signal;

reducing the sample rate of the first signal by a second down-sample factor prior to cancelling the time-division multiplexed return in the first signal to generate the second signal

outputting the second signal to a second receiver.

11. The method of claim 10 , further comprising:

recovering, in the second receiver, the time-division multiple access return from the second signal, and

outputting the time-division multiple access return.

12. The method of claim 10 , wherein cancelling the time-division multiplexed return in the first signal to generate the second signal includes:

remodulating the TDM return after recovery.

13. The method of claim 12 , wherein cancelling the time-division multiplexed return in the first signal to generate the second signal includes:

subtracting the remodulated TDM return from the first signal.

14. The system of claim 12 , wherein cancelling the time-division multiplexed return in the first signal to generate the second signal includes:

delaying the first signal to synchronize the first signal with the remodulated TDM return.

15. The method of claim 10 , further comprising:

increasing a sample rate of the second signal prior to outputting the second signal to the second receiver.

16. The method of claim 10 , wherein:

a first terminal is enabled for both time-division multiplexed returns and time-division multiple access returns; and

a second terminal is enabled for time-division multiple access returns and not enabled for time-division multiplexed returns; wherein the time-division multiplexed returns are received from the first terminal and the time-division multiple access returns are received from the second terminal.

17. The method of claim 16 , wherein the first terminal is a mobile terminal and the second terminal is a stationary terminal.

18. The method of claim 16 , further comprising:

initiating communications with a satellite communications gateway based on time-division multiple access returns; and

switching to communications based on time-division multiplexed returns based on instructions received from the satellite communications gateway.