Patent ID: 6487236
Filing Date: 2002-11-26
Classification: H04B,H04J

Abstract:
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,comprising the steps of: computing a certainty of the value of each correlation energy as a reliability for the correlation energy for every said Walsh number, acquiring corrected correlation energies by introducing said corresponding reliabilities with respect to said correlation energies, and selecting said maximum correlation energy from among obtained said corrected correlation energies by using said corrected correlation energies.