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Spreading sequences for downlink MC-CDMA transmission

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3 Author(s)
Pogossova, E. ; Dept. of Inf. Technol., Tampere Univ. of Technol., Finland ; Egiazarian, K. ; Astola, J.

A major drawback of all multicarrier transmission schemes is an increased peak-to-average power ratio (PAPR). In multicarrier code division multiple access (MC-CDMA), this can be avoided by the proper choice of spreading sequences. This paper addresses the problem of spreading sequence selection for the downlink MC-CDMA system with respect to their PAPR properties and the resulting complexity of the transmitter. Both lightly loaded and fully loaded systems are considered. A novel complex-valued orthogonal spreading transform is proposed as an alternative to those frequently encountered in the literature. It is derived from the Vilenkin-Chrestenson orthogonal matrix, as a result of generalizing the relationship, established between the orthogonal sets of Walsh-Hadamard and complementary Golay sequences. The approach, described in the paper, provides a scheme for generating a wide class of spread spectrum sequences which provide low PAPR and allow for an efficient implementation.

Published in:

Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th  (Volume:7 )

Date of Conference:

26-29 Sept. 2004