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AssigneeFujitsu Limited
InventorsTakanori Iwamatsu, Mamoru Fukui
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An apparatus for achieving demodulation in a radio communications system using M-sequence orthogonal modulation capable of achieving a good characteristic near the error rate characteristic obtained in the case of a synchronous detection system while suppressing an increase in the size of the hardware, including a demodulation apparatus having a reliability computing unit for computing a certainty of a value of a correlation energy as a reliability R for the correlation energy of every Walsh number, a correcting unit for obtaining a corrected correlation energy by introducing a corresponding reliability R with respect to the correlation energies, and a maximum energy selecting unit for selecting the maximum correlation energy from among obtained corrected correlation energies based on the same and demodulating a signal corresponding to a Walsh number corresponding to this maximum correlation energy as a received signal.
A demodulation method in a radio communications system using M-sequence orthogonal modulation wherein radio output signals which are subjected to M-sequence orthogonal modulation and transmitted from a transmission side as Walsh codes corresponding to Walsh numbers are received at a reception unit and reproduced as I-channel input signals and Q-channel input signals, correlation energies (E0, E1, . . . ) for every said Walsh number are obtained from outputs after Hadamard Transform processing, the maximum correlation energy among these correlation energies is selected, and a signal corresponding to the Walsh number corresponding to this is demodulated as a received signal,
A demodulation apparatus in a radio communications system using M-sequence orthogonal modulation wherein radio output signals which are subjected to M-sequence orthogonal modulation and transmitted from a transmission side as Walsh codes corresponding to Walsh numbers are received at a receiving unit and reproduced as I-channel input signals and Q-channel input signals, correlation energies (E0, E1, . . . ) for every said Walsh number are obtained from outputs after Hadamard Transform processing, the maximum correlation energy among these correlation energies is selected, and the signal corresponding to the Walsh number corresponding to this is demodulated as a received signal, having:
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