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Orthogonal frequency division multiplexing (OFDM) is well known for its efficient solution to the task of compensating the influence of a broadband channel with strong multipath propagation using equalization in frequency domain. However the extremely high peak to average power ratio of OFDM modulated transmit signals and the demand of linearity inside the signal transmission chain results in a poor energy efficiency at the power amplifier. In this paper a communication system using FSK modulation and gaussian pulse shaping is applied to a broadband channel. Equalization at the receiver is done in frequency domain as known in OFDM. To simplify the equalization, a cyclic prefix is added to the transmit signal also. This novel transmission scheme is introduced and evaluated in terms of spectral efficiency and bit error rate performance in this paper. It will be shown, that signals with constant envelope such as FSK modulated signals can also make use of an OFDM like equalization procedure with comparable BER performance.