Patent ID: 7542515

Claim:
A method for use in performing channel training in a MIMO based multicarrier system, comprising: for a first training time slot within a data frame, dividing tones of a first OFDM training symbol among K spatial channels, wherein each of said tones of said first OFDM training symbol is transmitted in only one of said K spatial channels during said first training time slot; and for a second training time slot within said data frame, dividing tones of a second OFDM training symbol among said K spatial channels, wherein each of said tones of said second OFDM training symbol is transmitted in only one of said K spatial channels during said second training time slot and tones from said first training time slot are not repeated within the same spatial channel in said second training time slot; wherein tones transmitted within a first spatial channel of said K spatial channels during said first and second training time slots are transmitted at a power level that is proportional by a predetermined factor to a power level used to transmit user data in said first spatial channel within said data frame and tones transmitted within a second spatial channel of said K spatial channels during said first and second training time slots are transmitted at a power level that is proportional by said predetermined factor to a power level used to transmit user data in said second spatial channel within said data frame, wherein said power levels used to transmit said user data within said first and second spatial channels are set using adaptive power loading techniques.