Patent ID: 8102882

Claim:
A method comprising: obtaining, in a radio transmitter of a wireless multicarrier communication system, channel state information describing attenuation effected by a radio channel to subcarriers used in the data transmission; encoding, in the radio transmitter, different portions of a plurality of data bits with different degrees, the degree of an encoded data bit being defined by the number of parity check equations protecting the data bit; mapping, in the radio transmitter, encoded data bits to symbols; allocating, in the radio transmitter, the symbols to subcarriers on the basis of the channel state information and the degree of encoded bits associated with each symbol; determining, in the radio transmitter on the basis of the channel state information, a number of subcarriers to be truncated due to high attenuation, the number of subcarriers to be truncated relative to the total number of subcarriers being substantially fixed; allocating symbols comprising encoded data bits protected by higher number of parity check equations on the subcarriers that are not determined to be truncated and allocating symbols comprising encoded data bits protected by lower number of parity check equations on the subcarriers that are determined to be truncated; truncating, in the radio transmitter, the determined subcarriers and symbols on the determined subcarriers; allocating, in the radio transmitter, the available transmit power to the non-truncated subcarriers, and transmitting a multicarrier signal comprising symbols on the non-truncated subcarriers.