Bit allocation among carriers in multicarrier communications
First Claim
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1. A multicarrier data modulation method, comprising:
- using a plurality of carrier signals, by a transmitter, to modulate a plurality of data bit signals of a serial input data stream, wherein subsets of the plurality of data bit signals comprise error correction symbols, and wherein a number of data bit signals modulated on at least one carrier signal is fewer than a bit size of one of the error correction symbols; and
allocating, by the transmitter, the plurality of data bit signals among the plurality of carrier signals, wherein said allocating includes reducing a number of carrier signals that modulate data bit signals belonging to different error correction symbols during a transmission period.
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Abstract
A technique is provided that may be employed in multicarrier communications to improve the efficiency of error correction using symbol-oriented error correction methodologies, by reducing the number of error correction code symbols (102, 104 . . . ) that are received in error that result from a single channel error. More specifically, in this technique, bits from the symbols are allocated among the channels in such a way as to minimize the number of respective channels that are allocated bits belonging to more that one respective symbol during a respective transmission period.
19 Citations
38 Claims
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1. A multicarrier data modulation method, comprising:
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using a plurality of carrier signals, by a transmitter, to modulate a plurality of data bit signals of a serial input data stream, wherein subsets of the plurality of data bit signals comprise error correction symbols, and wherein a number of data bit signals modulated on at least one carrier signal is fewer than a bit size of one of the error correction symbols; and allocating, by the transmitter, the plurality of data bit signals among the plurality of carrier signals, wherein said allocating includes reducing a number of carrier signals that modulate data bit signals belonging to different error correction symbols during a transmission period. - View Dependent Claims (2, 3, 4)
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5. A method for modulating data bit signals over a transmission channel having a plurality of subchannels, comprising:
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mapping, by a transmitter, a predetermined number of a plurality of data bit signals of an input data stream into each of a plurality of error correction symbols; in response to the mapping, allocating, by the transmitter, the plurality of data bit signals among groups of the plurality of subchannels such that a number of subchannels that are to include data bit signals from more than one error correction symbol during a transmission period is reduced or minimized; and modulating, by the transmitter, the plurality of data bit signals over the plurality of subchannels. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13)
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14. A multicarrier modulation system, comprising:
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a transceiver configured to generate a plurality of carrier signals for use in modulating a plurality of data bit signals of a serial input data stream; and a processor coupled to the transceiver and configured to; cause the transceiver to transmit the plurality of data bit signals over a plurality of carrier signals, wherein subsets of the plurality of data bit signals comprise error correction symbols, and wherein a number of data bit signals modulated on at least one carrier signal is fewer than a bit size of one of the error correction symbols; and allocate the plurality of data bit signals among the plurality of carrier signals, such that a number of carrier signals that are to modulate data bit signals belonging to different error correction symbols during a transmission period is reduced. - View Dependent Claims (15, 16, 17, 18)
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19. A multicarrier modulation system, comprising:
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a transceiver configured to generate a plurality of carrier signals for modulating a plurality of data bit signals of a serial input data stream; and a processor coupled to the transceiver and configured to; map a predetermined number of the plurality of data bit signals of the serial input data stream into each of a plurality of error correction symbols; allocate the plurality of data bit signals among groups of subchannels of a plurality of subchannels such that a number of subchannels that are to modulate include data bit signals from more than one error correction symbol during a transmission period is reduced or minimized; and cause the transceiver to modulate the plurality of data bit signals over the plurality of subchannels. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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27. A memory, comprising stored executable program instructions configured to cause an apparatus, in response to execution of the program instructions by the apparatus, to perform operations comprising:
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transmitting a plurality of data bit signals of a serial input data stream over a plurality of carrier signals, wherein subsets of the plurality of data bit signals comprise error correction symbols, and wherein a number of data bit signals modulated on at least one carrier signal is fewer than a bit size of one of the error correction symbols; allocating the plurality of data bit signals among the plurality of carrier signals, such that a number of carrier signals that are to modulate data bit signals belonging to different error correction symbols during a transmission period is reduced. - View Dependent Claims (28, 29, 30)
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31. A memory, comprising stored executable program instructions configured to cause an apparatus, in response to execution of the program instructions by the apparatus, to perform operations comprising:
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mapping a predetermined number of a plurality of data bit signals of an input data stream into each of a plurality of error correction symbols; in response to the mapping, allocating the plurality of data bit signals among groups of subchannels of a plurality of subchannels such that a number of subchannels that are to include data bit signals from more than one error correction symbol during a transmission period is reduced or minimized; and modulating the plurality of data bit signals over the plurality of subchannels. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38)
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Specification