The Interleaved Frequency Division Multiple Ac-

cess (IFDMA) scheme is based on compression, repetition and

subsequent user dependent frequency shift of a modulated signal.

Multiple access is enabled by the assignment of overlapping but

mutually orthogonal subcarriers to each user. In this paper it

is shown that IFDMA can be regarded as unitary precoded

OFDMA with interleaved subcarriers. On the other hand,

IFDMA is shown to be a CDMA variant with frequency domain

orthogonal signature sequences and chip interleaving. Thus, it

combines the advantages of single and multi carrier transmission

such as low peak to average power ratio, orthogonality of the

signals of different users even for transmission over a time

dispersive channel and low complexity. Simulation results show

the good performance of coded IFDMA transmission over a

mobile radio channel for different data rates.