Broadcast relaying via single-channel transmission
Systems and methods for relaying in broadcast single-frequency networks are disclosed herein. A single-frequency network can be formed in part using transmitters that receive data via a cooperative relay channel instead of a studio-to-transmitter link. In some embodiments, transmitter may use a portion of its transmission time to relay in-band information to the single-frequency network transmitter using time-division multiplexing.
1. A method, comprising:
receiving, on a broadcast channel, a signal comprising a first frame encoded at a first data rate;
forming an estimated frame by processing the received signal;
forming a second frame by encoding the estimated frame at a second data rate; and
broadcasting the second frame on the broadcast channel from a wireless transmitter.
2. The method of claim 1 , wherein the second data rate is lower than the first data rate.
3. The method of claim 1 , wherein the broadcast of the second frame is substantially synchronized with a substantially identical transmission from a different wireless transmitter.
4. The method of claim 1 , wherein forming the estimated frame by processing the received signal comprises regenerating an estimated bit-interleaved coded modulation signal.
5. The method of claim 1 , wherein the received signal includes control information, and wherein forming the second frame comprises encoding the estimated frame based at least in part on the control information.
6. The method of claim 5 , wherein the control information comprises timing information.
7. The method of claim 1 , wherein the received signal is compliant with an Advanced Television Systems Committee (ATSC) 3.0 specification.
8. An apparatus, comprising:
an antenna tuned to a broadcast channel;
a transmitter tuned to the broadcast channel; and
a processor configured to:
receive, from the antenna, a signal comprising a first frame encoded at a first data rate;
form an estimated frame by processing the received signal;
form a second frame by encoding the estimated frame; and
transmit the second frame to the transmitter for wireless transmission.
9. The apparatus of claim 8 , further comprising a timing circuit configured to control timing of broadcasts from the transmitter.
10. The apparatus of claim 8 , wherein the processor is further configured to form the estimated frame by regenerating an estimated bit-interleaved coded modulation signal.
11. The apparatus of claim 8 , wherein the received signal includes control information, and wherein processor is further configured to form the second frame by encoding the estimated frame based at least in part on the control information.
12. The apparatus of claim 11 , wherein the control information comprises timing information.
13. The apparatus of claim 8 , wherein the antenna is configured to receive the signal from a cooperative relay channel.
14. A method, comprising:
receiving, on a studio-to-transmitter link, a signal comprising data;
forming a first frame by encoding the data at a first data rate;
forming a second frame by encoding the data at a second data rate;
wirelessly broadcasting the first frame on a broadcast channel; and
wirelessly broadcasting the second frame on the broadcast channel after wirelessly broadcasting the first frame on the broadcast channel,
wherein the data comprises a television signal for transmission on the broadcast channel.
15. The method of claim 14 , wherein the first data rate is higher than the second data rate.
16. The method of claim 14 , wherein the first frame comprises a bootstrap signal.
17. The method of claim 14 , wherein forming the first frame further comprises encoding control information corresponding to the broadcasting of the second frame on the broadcast channel.
18. The method of claim 14 , wherein forming the second frame comprises forming a frame compliant with an Advanced Television Systems Committee (ATSC) 3.0 specification.
19. The method of claim 14 , further comprising broadcasting the second frame substantially simultaneously from two transmitters on the same channel.
20. The method of claim 14 , wherein:
forming the first frame comprises encoding the data using a low-density parity check (LDPC) code having a first code rate; and
forming the second frame comprises encoding the data using an LDPC code having a second code rate.