A method of wireless multicarrier communicating over a high-throughput communication channel comprising one or more subchannels and one or more spatial channels, the method comprising: transmitting a channelization field on a compatibility channel, the compatibility channel comprising a single subchannel of a plurality of subchannels as part of a current data unit, the channelization field indicating a frequency and space configuration of subsequent portions of the current data unit, wherein the frequency and space configuration comprises one of: a wideband channel having up to four frequency separated subchannels, wherein each frequency separated subchannel has distinct data streams transmitted thereon; a multiple-input-multiple-output - MIMO channel comprising a single subchannel having up to four spatial subchannels, wherein each spatial subchannel has distinct data streams transmitted thereon; and a wideband-MIMO channel comprising two or more frequency separated subchannels wherein each subchannel has two or more spatial channels and wherein each frequency separated subchannel spatial subchannel has distinct data streams transmitted thereon; transmitting a high-throughput training field (416,516,616,816,916) in accordance with the frequency and space configuration indicated in the channelization field, the high throughput training field (416,516,616,816,916) to be used by a receiving station to estimate a channel matrix of the high-throughput communication channel; and transmitting the subsequent portions of the current data unit in accordance with the frequency and space configuration indicated in the channelization field; wherein the transmitting the channelization field comprises transmitting the channelization field on the compatibility channel with a rotated binary phase shift keying - BPSK - modulation of subcarriers of the compatibility channel. transmitting a channelization field on a compatibility channel, the compatibility channel comprising a single subchannel of a plurality of subchannels as part of a current data unit, the channelization field indicating a frequency and space configuration of subsequent portions of the current data unit, wherein the frequency and space configuration comprises one of: a wideband channel having up to four frequency separated subchannels, wherein each frequency separated subchannel has distinct data streams transmitted thereon; a multiple-input-multiple-output - MIMO channel comprising a single subchannel having up to four spatial subchannels, wherein each spatial subchannel has distinct data streams transmitted thereon; and a wideband-MIMO channel comprising two or more frequency separated subchannels wherein each subchannel has two or more spatial channels and wherein each frequency separated subchannel spatial subchannel has distinct data streams transmitted thereon; a wideband channel having up to four frequency separated subchannels, wherein each frequency separated subchannel has distinct data streams transmitted thereon; a multiple-input-multiple-output - MIMO channel comprising a single subchannel having up to four spatial subchannels, wherein each spatial subchannel has distinct data streams transmitted thereon; and a wideband-MIMO channel comprising two or more frequency separated subchannels wherein each subchannel has two or more spatial channels and wherein each frequency separated subchannel spatial subchannel has distinct data streams transmitted thereon; transmitting a high-throughput training field (416,516,616,816,916) in accordance with the frequency and space configuration indicated in the channelization field, the high throughput training field (416,516,616,816,916) to be used by a receiving station to estimate a channel matrix of the high-throughput communication channel; and transmitting the subsequent portions of the current data unit in accordance with the frequency and space configuration indicated in the channelization field; wherein the transmitting the channelization field comprises transmitting the channelization field on the compatibility channel with a rotated binary phase shift keying - BPSK - modulation of subcarriers of the compatibility channel.