subchannel x and subchannel y each of the subchannels may include six tiles with a tile located in each of six equal frequency subpartitions e g subpartitions 204 208 212 216 220 and 224 each subpartition may be paired with an adjacent subpartition into a frequency partition that is directly and uniquely mapped to a respective transmit chain specifically tiles within subpartitions 204 and 208 may be mapped to transmit chain 124 tiles within subpartitions 212 and 216 may be mapped to transmit chain 128 and tiles within subpartitions 220 and 224 may be mapped to transmit chain 132 as can be seen in fig2 the frequency partitions which may account for the entire spectrum of the frequency band to accommodate the entire wideband transmission generated by the modulator 116 may be adjacent to and contiguous with one another with each transmit chain only being responsible for transmitting tiles that fall within in a relatively narrow bandwidth e g one third of the frequency band the out of band emissions may also be narrower this may allow the transmitters of the respective transmit chains to transmit with more power without exceeding limitations imposed by the regulatory spectral mask simulation results with ideal pas e g hard clippers or non linear pas with ideal pre distortion show a gain of 1 db in transmit power for.