Signal Mapping Method and Communication Device
AssigneeHitachi, Ltd.
InventorsSatoshi Tamaki, Mikio Kuwahara, Koki Uwano
Life of this patent
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Abstract
Ameliorate deterioration in quality of communication caused by intercell interference with respect to a multicarrier communications protocol, such as OFDM. A method of positioning an error correction-coded signal is changed with a data symbol that is transmitted simultaneously with a pilot signal and a data symbol that is not simultaneous with the pilot symbol. Else, a modulation protocol is changed with a data symbol that is transmitted simultaneously with a pilot signal and a data symbol that is not simultaneous with the pilot symbol. It would further be permissible to lower either a signal amplitude or a power level of a data symbol that is transmitted simultaneously with a pilot signal.
Claims19
A signal mapping method for mapping data signals and pilot signals having a known pattern in each symbol determined by a subcarrier number and a symbol number, or in each symbol determined by a frequency axis and a time axis, in a multicarrier communication system that communicates an encoded signal by using a plurality of subcarriers,
- the signal mapping method comprising steps of:
- subjecting a transmit signal of N0 bits to error correction encoding to generate a signal of N1 bits;
- and
- when signals that can be mapped in a plurality of first data symbols not simultaneously transmitted with the pilot symbols are M0 bits, and signals that can be mapped in a plurality of second data symbols simultaneously transmitted with the pilot symbols are M1 bits,
- (i) in a case of N0≦M0≦N1,
- extracting M0 bits minimumly required for decoding the transmit signal of N0 bits before the error correction encoding, from the signals N1 bits after the error correction encoding to configure punctured codes of an encoding ratio N0/M0, mapping the punctured codes in the plurality of first data symbols, and also mapping a part or all of bits of the signals that are not mapped in the plurality of first data symbols among the signals after the error correction encoding, in the plurality of second data symbols,
- (ii) in a case of M0>N1,
- mapping all of the signals N1 bits after the error correction encoding in the plurality of first data symbols,
- (iii) in a case of M0<N0≦M0+M1,
- configuring the codes of the encoding ratio N0(M0+M1) from the signals N1 bits after the error correction encoding, and mapping the codes in the plurality of first data symbols and the plurality of second data symbols.
(canceled)
A signal mapping method for mapping data signals and pilot signals having a known pattern in each symbol determined by a subcarrier number and a symbol number, or in each symbol determined by a frequency axis and a time axis, in a multicarrier communication system that communicates an encoded signal by using a plurality of subcarriers,
- the signal mapping method comprising steps of:
- using a modulation system having information in an amplitude direction and a phase direction in data symbols not simultaneously transmitted with the pilot signals, and
- using a modulation system having information only in the phase direction without information in the amplitude direction in the data symbols simultaneously transmitted with the pilot signals so that a large peak power does not occur for each symbol.
(canceled)
(canceled)
A communication device for mapping data signals and pilot signals having a known pattern in each symbol represented by a matrix of subcarriers or frequencies and symbol numbers or a time axis, in a multicarrier communication system that communicates an encoded signal by using a plurality of subcarriers,
- the communication device comprising:
- a symbol modulation block that modulates a signal allocated to the each symbol,
- wherein the symbol modulation block makes a maximum number of transmission bits transmittable per one symbol of a modulation system used in a data symbol simultaneously transmitted with the pilot signals be smaller than a maximum number of transmission bits transmittable per one symbol of the modulation system used in the data symbol not simultaneously transmitted with the pilot symbols.
-22. (canceled)
Dependencies are inferred from the claim text.