Method and device for transmitting data in a multi-carrier systemcomprising parallel concatenated coding and modulation

• US 20050047514A1
• Filed: 05/08/2001
• Published: 03/03/2005
• Est. Priority Date: 05/08/2001
• Status: Active Grant

• Current Assignee: Callahan Cellular LLC (Intellectual Ventures LLC)
• Original Assignee: Prasendt Investments LLC (Intellectual Ventures LLC)
• Inventors: Bolinth, Edgar, Lombardi, Giancarlo, Koora, Kalyan
• Granted Patent: US 7,421,030 B2
• Time in Patent Office: Days
• US Class Current: 375/261
• CPC Class Codes: H04L 1/005 Iterative decoding, including iteration between signal detection and decoding operation
• CPC Class Codes: H04L 1/006 Trellis-coded modulation
• CPC Class Codes: H04L 1/0065 Serial concatenated codes
• CPC Class Codes: H04L 1/0068 by puncturing
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

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.

Claims

1-25. -25. (canceled)

26. A transmit device for data transfer in a multi-carrier system, comprising:

a first encoding level for performing a first encoding on a serial data stream;

a transmit demultiplexer level for dividing the encoded serial data stream into a plurality of parallel data streams;

a second encoding level for performing a second encoding for the plurality of parallel data streams, resulting in a plurality of encoded parallel data streams;

a modulator level for performing a QAM modulation for the plurality of encoded parallel data streams, resulting in a plurality of modulated parallel data streams;

a transmit multiplexer level for rearranging the modulated parallel data streams into a serial data stream;

a multi-carrier modulator for performing a pulse shaping and a copying of QAM symbols onto a multi-carrier time signal; and

a bit-load device for performing a bit-load algorithm and for controlling both the transmit demultiplexer level and the transmit multiplexer level;

wherein the second encoding level has a first plurality of encoders, the modulator level has a second plurality of TCM modulators for performing a plurality of different modulation procedures, and the first encoding level has a puncturer for performing a data speed adaptation of the encoded serial data stream depending on the bit-load algorithm performed.

27. A transmit device for data transfer in a multi-carrier system as claimed in claim 26, wherein the first encoding level includes an interleaver for performing an interleaving of the serial data stream.

28. A transmit device for data transfer in a multi-carrier system as claimed in claim 26, wherein the multi-carrier modulator performs at least one of an OFDM, an MC-CDMA and a CDMA modulation.

29. A receive device for data transfer in a multi-carrier system comprising:

a multi-carrier demodulator for returning a transfer multi-carrier time signal in a serial sequence of QAM symbols;

a received demultiplexer level for dividing the serial sequence of QAM symbols into a plurality of parallel sequences of QAM symbols;

a demodulator level for performing a plurality of QAM demodulations on the parallel sequences of QAM symbols, resulting in a plurality of demodulated parallel data streams;

a first decoding level for performing a first decoding of the demodulated parallel data streams for generating a parallel data stream;

a receive multiplexer level for rearranging the parallel data stream into a serial data stream;

a second decoding level for performing a second decoding of the serial data stream; and

a bit-load device for performing a bit-load algorithm and for controlling the receive demultiplexer level and the receive multiplexer level;

wherein the modulator level has a first plurality of QAM demodulators for performing a plurality of different demodulation procedures, the first decoding level has a second plurality of second decoders which are implemented as TCM demodulators, and the second decoding level has a de-puncturer for performing a data speed adaptation of the serial input data stream depending on the bit-load algorithm performed.

30. A receive device for data transfer in a multi-carrier system in claim 29, wherein the second decoding level includes a de-interleaver for reversing an interleaving of the serial input data stream.

31. A receive device for data transfer in a multi-carrier system as claimed in claim 29, wherein the multi-carrier demodulator performs at least one of OFDM, MC-CDMA and CDMA demodulation.

32. A receive device for data transfer in a multi-carrier system as claimed in claim 29, wherein the second decoding level performs a Viterbi algorithm.

33. A receive device for data transfer in a multi-carrier system as claimed in claim 29, further comprising:

a transmitter chain which is a reproduction of a transmit path and generates a reproduced serial sequence of QAM symbols from the data stream which is generated by the second decoding level;

an analysis unit for generating a reliability information signal depending on the reproduced serial sequence of QAM symbols and the received serial sequence of QAM symbols of a multi-carrier demodulator; and

a select device for selecting a reliability information signal of a 1^st to k^th iteration, wherein the reliability information signal of a 1^st iteration represents a function of a channel state information.

34. A receive device for data transfer in a multi-carrier system as claimed in claim 33, wherein the channel state information is derived from a channel estimation.

35. A receive device for data transfer in a multi-carrier system as claimed in claim 33, wherein the plurality of QAM demodulators and first decoders, which are implemented as TCMD modulators, are controlled depending on the selected reliability information signals.

36. A receive device for data transfer in a multi-carrier system as claimed in claim 29, wherein the second decoding level performs a soft-output Viterbi algorithm for outputting a reproduced reliability information signal.

37. A receive device for data transfer in a multi-carrier system as claimed in claim 36, further comprising:

a feedback path for feeding back the reproduced reliability information signal; and

a select device for selecting a reliability information signal of a 1^st to k^th iteration, wherein the reliability information signal of a 1^st iteration represents a function of a channel state information.

38. A receive device for data transfer in a multi-carrier system as claimed in claim 37, wherein the channel state information is derived from a channel estimation.

39. A receive device for data transfer in a multi-carrier system as claimed in claim 37, wherein the plurality of post-connected first decoders are controlled depending on the selected reliability information signals.

40. A received device for data transfer in a multi-carrier system as claimed in claim 38, wherein the feedback path includes at least one of a puncturer and an interleaver, which are reproductions of a corresponding element of a transmit path.

41. A method for data transfer in a multi-carrier system, the method comprising the steps of:

a) performing a first encoding on a serial data stream;

b) dividing the serial data stream into a plurality of parallel data streams;

c) performing a plurality of second encodings on the parallel data streams;

d) performing a plurality of QAM modulations on the encoded parallel data streams;

e) rearranging the QAM-modulated parallel data streams into a serial sequence of QAM symbols;

f) performing a multi-carrier modulation;

g) transferring the modulated data stream on at least one channel of a transfer medium;

h) performing a multi-carrier demodulation for generating a serial sequence of QAM symbols;

i) dividing the serial sequence of QAM symbols into a plurality of parallel sequences of QAM symbols;

j) performing a plurality of QAM demodulations on the parallel sequences of QAM symbols;

k) performing a plurality of first demodulations on the QAM-demodulated parallel data streams;

l) rearranging the decoded parallel data streams into a serial data stream;

m) performing a second decoding of the serial data stream; and

n) performing a bit-load algorithm for controlling the steps b), e), i) and 1) wherein a puncturing is performed after step a) and a de-puncturing is performed before step m) depending on the bit-load algorithm which has been performed.

42. A method for data transfer in a multi-carrier system as claimed in claim 41, the method further comprising the steps of:

performing an interleaving of the serial data stream following step a); and

performing a reversal of the interleaving of the serial input data stream following step 1).

43. A method for data transfer in a multi-carrier system as claimed in claim 41, wherein different combinations of at least one second encoding and at least one post-connected QAM modulation are performed in steps c) and d), and

different combinations of at least one first decoding and at least one pre-connected QAM demodulation are performed in steps j) and k).

44. A method for data transfer in a multi-carrier system as claimed in claim 41, wherein at least one of an OFDM, an MC-CDMA and CDMA modulation is performed in step f), and at least one of an OFDM, MC-CDMA and a CDMA demodulation is performed in step h).

45. A method for data transfer in a multi-carrier system as claimed in claim 41, wherein a Viterbi algorithm is performed in step m).

46. A method for data transfer in a multi-carrier system as claimed in claim 41, wherein step m) further includes feeding back the decoded serial data stream via a transmitter chain for generating a reproduced serial sequence of QAM symbols, generating a reliability information signal depending on the reproduced and the received serial sequence of QAM symbols, and selecting and copying a reliability information signal of a 1^st to k^th iteration for controlling step j), wherein the copied reliability information signal of a 1^st iteration represents a function of a channel state information.

47. A method for data transfer in a multi-carrier system as claimed in claim 41, wherein a soft-output Viterbi algorithm for outputting a calculated reliability information signal is performed in step m).

48. A method for data transfer in a multi-carrier system as claimed in claim 46, wherein step m) further includes linking the calculated reliability information signal back into a feedback path, and selecting and copying a reliability information signal of a 1^st to k^th iteration for controlling step i), wherein the copied reliability information signal of the 1^st iteration represents a function of a channel state information.

49. A method for data transfer in a multi-carrier system as claimed in claim 46, wherein the channel state information is derived from a channel estimation.

50. A method for data transfer in a multi-carrier system as claimed in claim 48, the method further comprising the step of performing at least one of a puncturing and an interleaving in the feedback path as in the transmit path.