Novel OFDM transceiver with time-domain scrambling

In cellular OFDM systems with the frequency reuse factor as one, all the same subcarriers are used in every sector of adjacent cells. This induces very strong intercell interference, particularly for the user equipment at the cell edge. A novel OFDM transceiver with time-domain scrambling is proposed in this paper to suppress the intercell interference and provide the frequency diversity. Numerical results proved that the proposed scheme considerably improves the spectrum efficiency and the overall OFDM system throughput in both single-cell and multicell environments. By using long scrambling in the time domain, an improvement in estimates of channel tap delays for frame synchronization and fast cell search can be also realized.