Collaborative space-time spreading scheme for higher than unity rate CDMA downlink

I. Shakya, F. H. Ali, E. Stipidis

    Research output: Contribution to journalArticlepeer-review


    A novel scheme referred to as collaborative space-time spreading is proposed to provide a higher than unity rate with spatial diversity gain for the downlink of a CDMA system operating in a fading channel. This is achieved by performing collaborative coding and spreading over groups of T users, each of which is assigned a single orthogonal spreading sequence and followed by space-time encoding on the total composite signal of all groups. A user terminal simply despreads the incoming signal to recover the composite T-user group data and then extracts its intended data after space-time and collaborative decoding. Extensive comparisons with other relevant schemes are provided to show the superiority of this approach.

    Original languageEnglish
    Pages (from-to)1129-1130
    Number of pages2
    JournalElectronics Letters
    Issue number22
    Publication statusPublished - 4 Nov 2009


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