Techniques for making channel assignments to reduce interference and increase capacity of wireless networks are described. In an implementation, a signal is received at a first station from a second station. A signal strength is measured and compared to other signal strength measurements of signals received from other stations. The signal strength is determined to be relatively weak based on the comparison, and the second station is assigned to a first subchannel that includes subcarriers reserved for stations with relatively weak signals. Subsequently, the signal strength measurement is repeated and the signal strength is determined to be relatively strong in comparison to the other signal strengths. The second station is then reassigned to a second subchannel that includes subcarriers reserved for stations with relatively strong signals.