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We propose the use of the discrete cosine transform (DCT) and discrete sine transform (DST), as well as their inverses, for spreading in multi-carrier (MC) code division multiple access (CDMA) systems. The DCT matrix works as a multi-level orthogonal (MLO) spreading code set. More generally, the DCT can be used in any spread spectrum system including single-carrier CDMA systems, MC-CDMA and MC direct...
In this paper, we describe a generalized version of multicarrier CDMA (MC-CDMA) that extends to multiple frequency sub-bands or multiple bands. We term this frequency-generalized MC-CDMA (FG-MC-CDMA). This technique can provide more flexibility in selection of data rates and a larger diversity order than comparable schemes, by generalizing MC-CDMA to allow for different spreading factors. We describe...
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