An MSE-OFDM System with Reduced Implementation Complexity Using Pseudo Random Prefix

We propose a new Multi-Symbol Encapsulated Orthogonal Frequency Division Multiplexing (MSE-OFDM) system with reduced implementation complexity in this paper, by replacing the traditional cyclic prefix (CP) with one pseudo random sequence. Although robust performance and high bandwidth efficiency are achieved, the receiver implementation of the previous MSE-OFDM system is substantially more complicated than traditional OFDM. In this paper, we propose a new cyclic prefix for MSE-OFDM using pseudo random sequences. With the new introduced cyclic prefix, inter-symbol interference (ISI) between OFDM symbols within one MSE-OFDM frame can be easily canceled in time domain. An iterative intercarrier interference (ICI) cancellation algorithm is also proposed in this paper. Equalization of the OFDM signal can therefore be achieved on every OFDM symbol basis, based on our new hybrid domain equalizer. It is shown that the implementation complexity of the new MSE- OFDM receiver with the pseudo random sequence cyclic prefix is comparable to the traditional OFDM. The performance of the proposed MSE-OFDM is also analyzed and verified through numerical simulations.