Patent ID: 8379619

Claim:
A method of improving subcarrier permutation to achieve high frequency diversity of OFDMA systems in wireless networks, comprising: introducing different tone selections for different OFDMA symbols in distributed resource units (DRUs) in a frequency partition, such that a DRU in the frequency partition has sufficient frequency diversity if a channel has only a few tones in each OFDMA symbol of the DRU, wherein the subcarrier permutation uses a permutation equation f(m,s) that changes to f(m,s)=(m+13*(s+l))mod L SP,l , wherein m is a subcarrier pair index where 0 ≦m<L SP,l , L SP,l denotes the number of data subcarrier-pairs in the l th symbol within the DRU, l is a symbol index, s is a distributed logical resource unit (DLRU) where 0≦s<L DRU,FPi , L DRU,FPi number of distributed resource units (DRUs) in each frequency partition i, thereby making tone-selection results different for different OFDMA symbols; and communicating the DRUs with one of a mobile station (MS) and a base station (BS).