Patent ID: 7447269
Filing Date: 2008-11-04
Classification: H04L

Abstract:
1. A radio-communication system, said radio-communication system comprising a first radio station that divides and allocates a transmit signal coded at an encoder to plural subcarriers and transmits the divided signals and a second radio station that combines plural received signals each of which has been demodulated individually at each of the subcarriers and decodes the combined signal, wherein said plural subcarriers are grouped into plural subcarrier groups each of which includes one or more subcarriers; said first and second radio stations share information on a first bit number which is the maximum number of transmitting bits per symbol of each of said plural subcarrier groups; said first radio station divide and allocate the coded transmit signal to each of the subcarriers so that the divided transmit signal at each of said subcarriers may have said first bit number of the subcarrier group to which said subcarrier belongs; each of the subcarriers determines the second bit number; and at least a part of the transmit signal allocated to each of the subcarriers by the first radio station is modulated by a first modulation method capable of transmitting a second bit number; said second radio station comprises a demodulator which demodulates the signal received from said first radio station by a second modulation method capable of transmitting a third bit number per symbol that is determined for each of the subcarriers, outputs said first bit number per symbol of the subcarrier group to which said subcarrier belongs to a decoder as the result of the demodulation; and said decoder combines plural signals each of which has been demodulated individually at each subcarrier into a signal and decodes said signal; wherein said first radio station determines said second bit number of each of the subcarriers on the basis of the state of the propagation path of said subcarrier between said first and second radio stations; and wherein said second radio station determines said third bit number of each of the subcarriers on the basis of the state of the propagation path of said subcarrier between said first and second radio stations.