Orthogonal Frequency Division Multiple Access(OFDMA) basestations allow multiple users to transmit simultaneously on different subcarriers during the same symbol period.Subcarriers and power allocation to each user is to maximize the sum of user data rates,subjected to constraints on total power,bit error rate,and proportionality among user data rates.In the special high subchannel SNR case,an iterative root-finding method has linear-time complexity in the number of users and NlogN complexity in the number of subchannels.By relaxation of stri...