ZF equalizer and trellis demodulator receiver for SEFDM in fading channels

Abstract

The paper addresses the BER performance of nonorthogonal multicarrier (SEFDM, Spectrally Efficient Frequency Division Multiplexing) signals in LTE fading channels. The one tap ZF-equalizer and equivalent OFDM presentation of SEFDM signals is used to perform channel correction. Demodulation is done using trellis based demodulator. The proposed receiver structure has relatively low computation complexity compared to SEFDM demodulators which use sphere decoder. Thus the proposed receiver is applicable to SEFDM signals with high number of subcarriers as in WiFi, LTE, DVB-T2 systems. The resulting BER performance of SEFDM in various LTE fading channels using the proposed receiver is comparable with performance of QPSK OFDM with the same number of subcarriers. The analysis is done under assumption of perfect channel knowledge.