Randomized OFDM for multi-cell environments

This paper is concerned with a randomized OFDM (R-OFDM) scheme. The basic p rinciple is to apply a scrambling operation to several OFDM frames. With a proper design strategy, the scrambling operation will not affect intra-cell orthogonality of OFDM (even considering multi-path effect). For signals fr om different cells, mutually random scramblings are used to reduce their co rrelation. This alleviates the worst case inter-cell interference problem. R-OFDM combines some advantages of both OFDM and CDMA, namely, intra-cell i nterference avoidance, cross-cell interference mitigation as well as simple receiver structure.