GENERALIZED OFDM WITH FREQUENCY-DOMAIN EQUALIZATION IN A FREQUENCY SELECTIVE RAYLEIGH FADING CHANNEL
I. INTRODUCTION Orthogonal frequency-division multiplexing (OFDM) [1] is one of the promising techniques for very high-speed data transmissions in a severe frequency-selective fading channel [2]. However, since OFDM uses a numerous number of narrowband orthogonal subcarriers to transmit data in parallel, the problem of high peak-to-average power ratio (PAPR) arise. To alleviate the PAPR problem, a novel technique called generalized OFDM (GOFDM) is presented, in which OFDM symbols with less number of subcarriers are serially concatenated. Frequency-domain equalization (FDE) is applied to eliminate the intersymbol and inter-subcarrier interference. This paper evaluates the BER performance of generalized OFDM.