Data transmission method, transmitter, receiver, transceiver and transmission system
View Patent ↗A method of transmitting data includes generating interleaved data. The method also includes converting the interleaved data into a modulated signal, and transmitting the modulated signal. The interleaved data is also stored, for example, in a buffer. The method further includes determining whether a retransmission of the modulated signal is required, and retransmitting the interleaved data based on a result of that determination.
1. A method of transmitting data, comprising:
interleaving data to generate interleaved data,
converting said interleaved data into a modulated signal,
transmitting said modulated signal,
storing said interleaved data,
determining whether a retransmission of said modulated signal is required, said determining including receiving said modulated signal, said determining of whether a retransmission of said modulated signal is required being performed before a de-interleaving is performed on said received signal,
selectively retransmitting said interleaved data based on a result of said determining, and
forwarding the interleaved data to the de-interleaving operation only if the interleaved data is not retransmitted based on the result of the determining.
2. The method of claim 1 , further comprising
generating a retransmission request at a receiver receiving said modulated signal.
3. The method of claim 2 , wherein said retransmission request comprises an identifier of said modulated signal.
4. The method of claim 1 , wherein said retransmitting comprises retrieving said stored interleaved data and converting said stored interleaved data into said modulated signal.
5. The method of claim 1 , wherein said converting comprises trellis coding.
6. The method of claim 1 , wherein said converting comprises an orthogonal frequency division multiplexing modulation.
7. The method of claim 1 , further comprising performing Reed-Solomon coding of said data prior to said interleaving.
8. The method of claim 1 , wherein said storing comprises buffering said interleaved data.
9. A transmitter, comprising
an interleaver to provide interleaved data,
a modulator operably coupled to said interleaver to convert said interleaved data into a modulated signal,
a buffer unit operably coupled to said interleaver to buffer said interleaved data and operably coupled to said modulator to provide said buffered interleaved data thereto, and
a retransmission controller, said retransmission controller including an input to receive an indicator indicating whether said interleaved data is to be retransmitted, said indicator being generated after a transmission of said modulated signal and prior to de-interleaving said transmitted modulated signal, and an output operably coupled to said buffer unit to control outputting of said buffered interleaved data from said buffer unit to said modulator in dependence on said indicator.
10. The transmitter of claim 9 , wherein said indicator is indicative of a corruption of said modulated signal during a transmission.
11. The transmitter of claim 9 , wherein said modulator includes a discrete multitone modulator.
12. The transmitter of claim 9 , wherein said modulated signal comprises an orthogonal frequency division multiplexing symbol.
13. The transmitter of claim 9 , wherein said modulator includes a trellis code modulator.
14. The transmitter of claim 9 , further comprising
an analog interface operably coupled to said modulator, wherein said modulator transmits said modulated signal via said analog interface.
15. The transmitter of claim 14 , further comprising
a subscriber line operably coupled to said analog interface.
16. The transmitter of claim 9 , further comprising
a retransmission request interface coupled to said input of said retransmission controller, wherein said indicator comprises a retransmission request received at said retransmission request interface.
17. The transmitter of claim 16 , wherein said retransmission request includes an identifier of said modulated signal.
18. The transmitter of claim 9 , further comprising
a Reed-Solomon coder coupled to provide Reed-Solomon coded data to said interleaver.
19. The transmitter of claim 9 , wherein said modulator is coupled to said interleaver via said buffer unit and receives said interleaved data via said buffer unit.
20. An arrangement for use in a receiver, comprising:
a demodulator configured to generate a demodulated signal from a received orthogonal frequency division multiplexing symbol,
a de-interleaver coupled to said demodulator to de-interleave said demodulated signal,
a monitoring unit operably coupled to said demodulator to monitor corruption of said demodulated signal based on trellis decoding information or digital-to-analog conversion saturation obtained before said demodulated signal is input to said de-interleaver, said monitoring unit being further configured to determine based on said monitored corruption whether said demodulated signal is to be supplied to said de-interleaver, wherein the monitoring unit is configured to forward the demodulated signal to the de-interleaver only if the monitored corruption satisfies a predetermined criterion, and precludes the demodulated signal from being forwarded to the de-interleaver otherwise, and
a retransmission request generator coupled to said monitoring unit to generate a retransmission request based on said monitored corruption.
21. A data transmission system, comprising:
a transmitter comprising an interleaver to provide interleaved data, a storage unit coupled to said interleaver to store said interleaved data, an interface coupled to said storage unit to transmit a symbol generated based on said stored interleaved data, and a retransmission controller coupled to said storage unit,
a receiver comprising an interface to receive said symbol, a monitoring unit coupled to said interface and configured to monitor corruption of said symbol before said symbol is input to a de-interleaver, and a retransmission request generator coupled to said monitoring unit,
wherein said retransmission request generator is configured to generate a retransmission request and the monitoring unit does not forward the received symbols to the de-interleaver if said monitored corruption exceeds a pre-determined threshold, and wherein the monitoring unit does forward the received symbols to the de-interleaver if the monitored corruption does not exceed the pre-determined threshold, and
wherein said retransmission controller is configured to receive said retransmission request and to initiate outputting of said stored interleaved data from said storage unit to retransmit said interleaved data.
22. The transmission system of claim 21 , wherein said symbol comprises an orthogonal frequency division multiplexing symbol.
23. The transmission system of claim 21 , wherein said retransmission request comprises a symbol identifier identifying said symbol.
24. A receiver, comprising:
a monitoring unit configured to monitor corruption of a signal received at said receiver, said monitoring unit being configured to monitor said corruption at the first layer of the OSI layer model,
a signal processor operably coupled to said monitoring unit, and
a retransmission request generator operably coupled to said monitoring unit to generate a retransmission request,
said monitoring unit being configured to determine based on said monitored corruption whether a retransmission of said received signal is required and initiate the retransmission if the monitored corruption exceeds a pre-determined threshold, and output the received signal to said signal processor for further processing if the monitored corruption does not exceed the pre-determined threshold.
25. The receiver of claim 24 , wherein said monitoring unit is configured to monitor corruption of a received demodulated signal based on trellis decoding information or digital-to-analog conversion saturation of said received signal.
26. The receiver of claim 24 , wherein said received signal is an OFDM or DMT symbol.