for the influence of frequency selection in Wimax, we give some methods to use the frequency selection to improve the capacity of wimax.SINR PUSC FUSC AMC MIC (Mean Instantaneous Capacity)，EESM (Exponential Effective SINR Mapping)，E CRM (Effectiv

In this paper, a multicell OFDMA WiMAX network is considered for uating the performance analysis both in uplink and downlink .The QOS parameters like blocking time, download time and BER of the network are discussed on various physical layer conditio