Interleaved FDMA-a new spread-spectrum multiple-access scheme

• Published in: 1998 IEEE International Conference on Communications Vol. 2; pp. 1013 - 1017 vol.2
• Main Authors: Sorger, U., De Broeck, I., Schnell, M.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 1998
• Subjects: Costs; Electronic mail; Frequency conversion; Frequency division multiaccess; Intersymbol interference; Land mobile radio; Multiaccess communication; Multiple access interference; Spread spectrum communication; Time division multiple access
• ISBN: 0780347889; 9780780347885
• DOI: 10.1109/ICC.1998.685165

A new spread-spectrum multiple-access scheme applicable for both the uplink and the downlink of a mobile radio communications system is proposed, which is termed "interleaved frequency-division multiple-access". This scheme combines the advantages of spread-spectrum and multicarrier transmission. Moreover, it can be viewed as a special kind of a multicarrier spread-spectrum scheme where user discrimination is carried out using frequency-division multiple-access. The multiple-access capability is achieved by assigning to each user a different set of orthogonal subcarriers. The orthogonality between the different users is maintained at the receiver, even in time-dispersive channels resulting in no multiple-access interference. However, the cost to avoid multiple-access interference is to allow for intersymbol interference and therefore equalization is required at the receiver.