Patent ID: 7561558

Claim:
A method for supervising an OFDM wireless communication system including a MAC layer and a PHY layer, said PHY layer including a supervisor unit, the method comprising the acts of: inputting into the supervisor unit a first set of input data comprising a target bit rate (Target_Rate) and a target bit error rate (Target_BER); processing by the supervisor unit the first set of input data; outputting from the supervisor unit a code rate C, a set of codes M={M i } for specifying constellations for sub-channels; and outputting actual QoS data to the MAC layer including outputting an actual rate actually determined for a current transmission and an actual bit error rate (BER) actually determined for the current transmission, said PHY layer including the supervisor unit for controlling performance of the PHY layer, wherein the processing is for minimizing transmission power in the wireless communication system and comprises the acts of: calculating maximum bit rate achievable by every couple M/C, identified by modulation k and code-rate i, with all sub-channels turned on; eliminating the couples M/C for which a maximum achievable bit rate is less than requested bit rate; and for every couple useful M/C: calculating a minimum number of sub-channels required to achieve the bit rate B; deriving, from simulation-based curves, a signal to noise ratio (SNR) necessary to obtain a required BER and use it to derive the SNR required by a worst sub-channel; calculating a total received power for all N (k,i) sub-channels; selecting and outputting a selected couple M/C ((M,C) min — pow ) which minimizes P r , min ⁢ ⁢ _ ⁢ ⁢ pow = min ( k , i ) ⁢ { P r , tot ( k , i ) } .