Method and device for transferring data in a multi-carrier system having parallel concatenated encoding and modulation
View Patent ↗The invention relates to a transmitter-receiver pair for improved data transmission in a multi-carrier system and to a corresponding method, according to which a chain coding is used. To this end, a transmitter has a first coding stage, a transmission-demultiplexer stage, a second coding stage, a modulator stage, a transmission multiplexer stage and a multi-carrier modulator, whereby said transmission-demultiplexer stage and the transmission multiplexer stage are controlled by a bit loading device. Similarly, the receiver has a multi-carrier demodulator, a receiver demultiplexer stage, a first decoding stage, a receiver multiplexer stage and a second decoding stage, whereby the receiver multiplexer stage and demultiplexer stage are in turn controlled by the bit loading device.
1. A method comprising:
encoding, using a communication device, a data stream to generate an encoded data stream;
dividing, using the communication device, the encoded data stream into a plurality of parallel encoded data streams based at least in part on a bit loading algorithm, wherein the hit loading algorithm is based at least in part on properties of a transmission channel;
individually encoding, using the communication device, the parallel encoded data streams to generate a plurality of multiply-encoded parallel data streams; and
individually modulating, using the communication device, the plurality of multiply-encoded parallel data streams to generate a plurality of parallel symbol streams.
2. The method of claim 1 , further comprising:
combining the plurality of parallel symbol streams into a serial symbol stream;
generating a multi-carrier signal based on the serial symbol stream; and
transmitting the multi-carrier signal.
3. The method of claim 1 , wherein the encoded data stream is interleaved before being divided into the plurality of parallel encoded data streams.
4. The method of claim 3 , wherein the encoded data stream is punctured based at least in part on the bit loading algorithm before being interleaved.
5. The method of claim 1 , wherein at least one of the parallel encoded data streams has a higher bit rate than a bit rate of at least one other parallel encoded data stream.
6. The method of claim 1 , wherein individually modulating the plurality of multiply-encoded parallel data streams comprises;
modulating a first multiply-encoded parallel data stream according to a first modulation procedure; and
modulating a second multiply-encoded parallel data stream according to a second modulation procedure.
7. The method of claim 1 , wherein the parallel symbol streams comprise symbols selected from the group consisting of Binary Phase Shift Keying symbols, Quadrature Phase Shift Keying symbols, and Quadrature Amplitude Modulation symbols.
8. The method of claim 1 , wherein the bit loading algorithm is based at least in part on a transmission channel measurement.
9. The method of claim 1 , individually encoding the parallel encoded data streams to generate a plurality of multiply-encoded parallel data streams and individually modulating the plurality of multiply-encoded parallel data streams to generate a plurality of parallel symbol streams are both performed by trellis-coded modulation (TCM) modulators.
10. The method of claim 2 , wherein the multi-carrier signal comprises an Orthogonal Frequency Division Multiplexed signal, a Multi-Carrier Code Division Multiple Access signal, or a Code Division Multiple Access signal.
11. An apparatus comprising:
means for encoding a data stream to generate an encoded data stream;
means for dividing the encoded data stream into a plurality of parallel encoded data streams based at least in part on a bit loading algorithm, wherein the bit loading algorithm is based at least in part on properties of a transmission channel;
means for individually encoding the parallel encoded data streams to generate a plurality of multiply-encoded parallel data streams; and
means for individually modulating the plurality of multiply-encoded parallel data streams to generate a plurality of parallel symbol streams.
12. The apparatus of claim 11 , further comprising:
means for combining the plurality of parallel symbol streams into a serial symbol stream;
means for generating a multi-carrier signal based on the serial symbol stream; and
means for transmitting the multi-carrier signal.
13. The apparatus of claim 11 , further comprising:
means for interleaving the encoded data stream before the encoded data stream is divided into the plurality of parallel encoded data streams.
14. The apparatus of claim 13 , further comprising:
means for puncturing the encoded data stream based at least in part on the bit loading algorithm before the encoded data stream is interleaved.
15. The apparatus of claim 11 , wherein at least one of the parallel encoded data streams has a higher bit rate than a bit rate of at least one other parallel encoded data stream.
16. The apparatus of claim 11 , wherein the means for individually modulating the plurality of multiply-encoded parallel data streams to generate a plurality of parallel symbol streams comprises:
means for modulating a first multiply-encoded parallel data stream according to a first selected modulation procedure; and
means for modulating a second multiply-encoded parallel data stream according to a second selected modulation procedure.
17. The apparatus of claim 11 , wherein the parallel symbol streams comprise symbols selected from the group consisting of Binary Phase Shift Keying symbols, Quadrature Phase Shift Keying symbols, and Quadrature Amplitude Modulation symbols.
18. The apparatus of claim 11 , wherein the hit loading algorithm is based at least in part on a transmission channel measurement.
19. The apparatus of claim 11 , wherein the encoded data stream is encoded according to a Forward Error Correction (FEC) algorithm.
20. The apparatus of claim 12 , wherein the multi-carrier signal comprises an Orthogonal Frequency Division Multiplexed signal, a Multi-Carrier Code Division Multiple Access signal, or a Code Division Multiple Access signal.
21. A system comprising:
a first encoder configured to encode a data stream to generate an encoded data stream;
a demultiplexer configured to divide the encoded data stream into a plurality of parallel encoded data streams based at least in part on a bit loading algorithm, wherein the bit loading algorithm is based at least in part on properties of a transmission channel; and
a set of encoder-modulators configured to individually encode the parallel encoded data streams to generate a plurality of multiply-encoded parallel data streams, and to individually modulate the plurality of multiply-encoded parallel data streams to generate a plurality of parallel symbol streams.
22. The system of claim 21 , further comprising:
a multiplexer configured to combine the plurality of parallel symbol streams into a serial symbol stream; and
a multi-carrier modulator configured to generate a multi-carrier signal based on the serial symbol stream.
23. The system of claim 21 , further comprising: an interleaver configured to interleave the encoded data stream before the encoded data stream is divided into the plurality of parallel encoded data streams.
24. The system of claim 23 , further comprising: a puncturer configured to puncture the encoded data stream based at least in part on the bit loading algorithm before the encoded data stream is interleaved.
25. The system of claim 21 , Wherein at least one of the parallel encoded data streams has a higher bit rate than a bit rate of at least one other parallel encoded data stream.
26. The system of claim 21 , wherein a first encodermodulator is configured to modulate a first parallel encoded data stream according to a first modulation procedure, and wherein a second encoder-modulator of the set of encodermodulators is configured to modulate a second parallel encoded data stream according to a second modulation procedure.
27. The system of claim 21 , wherein the parallel symbol streams comprise symbols selected from the group consisting of Binary Phase Shift Keying symbols, Quadrature Phase Shift Keying symbols, and Quadrature Amplitude Modulation symbols.
28. The system of claim 21 , Wherein the bit loading algorithm is based at least in part on a transmission channel measurement.
29. The system of claim 22 , further comprising a transmitter configured to transmit the multi-carrier signal, wherein the transmitter is one of a wireless transmitter or a wireline transmitter.
30. The system of claim 22 , wherein the multi-carrier signal comprises an Orthogonal Frequency Division Multiplexed signal, a Multi-Carrier Code Division Multiple Access signal, or a Code Division Multiple Access signal.