Patent ID: 7773687

Claim:
A wireless apparatus for wirelessly communicating with an opposite wireless apparatus, comprising: a receiver for receiving propagation environment information, block error rate detection information and reception quality information from the opposite wireless apparatus; a table selector for selecting one of a plurality of tables in accordance with the received propagation environment information, each of the tables having target error rates corresponding to transmission modes; a threshold controller for controlling threshold values of reception quality in accordance with the received block error rate detection information and the selected table; a mode selector for selecting, with reference to comparison of the received reception quality information with the controlled threshold values, one of the transmission modes in order to transmit data to the opposite wireless apparatus with the selected transmission mode, wherein the propagation environment information comprises a maximum Doppler frequency, and wherein: each of the tables corresponds to one of maximum Doppler frequencies f 0 , f 1 , . . . , f R−1 , where f 0 <f 1 < . . . <f R−1 ; if x j−1 <f d ≦x j , then the table selector selects the table corresponding to f j ; if f d ≦x 0 , then the table selector selects the table corresponding to f 0 ; and if f d >x R−2 , then. the table selector selects the table corresponding to f R−1 , where: f d is the maximum Doppler frequency in the received propagation environment Information; i, j are integers; 0≦i ≦R−2; 1≦j≦R−2; and f i <x i <f i+1 .