Orthogonality analysis and improvement of MSE-OFDM system

Multi-Symbol Encapsulated Orthogonal Frequency Division Multiplexing (MSE-OFDM) system, in which one cyclic prefix (CP) is used for a frame of multiple OFDM symbols in the time domain, will be widely applied in future communication systems. The main purpose of the MSE-OFDM system is to enhance the bandwidth efficiency deteriorated by the CP of each OFDM symbol in relative static wireless channel environment. In this paper, a detailed orthogonality analysis of the MSE-OFDM system is demonstrated, based on which an improvement that the OFDM symbols are encapsulated in the frequency domain is proposed. The modified system can reduce the time delay of processing in the receiver end. In the mean time it provides great flexibility for pilot insertion as traditional OFDM system. For static wireless channel, more redundancy is eliminated with nearly the same bit error rate (BER) compared to the MSE-OFDM system. While for slowly mobile channel, such as the user end is at the speed of walking, lower BER is performed.