Multiuser Detection
Low complexity optimal joint detection for oversaturated multipleaccess communications
IEEE Transactions on Signal Processing
Power control and capacity of spread spectrum wireless networks
Automatica (Journal of IFAC)
Spectral efficiency of CDMA with random spreading
IEEE Transactions on Information Theory
IEEE Transactions on Information Theory
Optimal sequences and sum capacity of synchronous CDMA systems
IEEE Transactions on Information Theory
Quasi-orthogonal sequences for code-division multiple-access systems
IEEE Transactions on Information Theory
An optimal signal design for band-limited asynchronous DS-CDMA communications
IEEE Transactions on Information Theory
Multiuser signaling in the symbol-synchronous AWGN channel
IEEE Transactions on Information Theory
Rayleigh fading channels in mobile digital communication systems. I. Characterization
IEEE Communications Magazine
Rayleigh Fading Channels in Mobile Digital Communication Systems Part II: Mitigation
IEEE Communications Magazine
Spreading codes for direct sequence CDMA and wideband CDMA cellular networks
IEEE Communications Magazine
Extending the capacity of multiple access channels
IEEE Communications Magazine
Superposition Coding with Unequal Error Protection for the Uplink of Overloaded DS-CDMA System
Wireless Personal Communications: An International Journal
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An improved overloading scheme is presented for single-user detection in the downlink of multiple-access systems based on OCDMA/OCDMA (O/O). By displacing in time the orthogonal signatures of the two user sets that make up the overloaded system, the cross-correlation between the users of the two sets is reduced. For random O/O with square-root cosine rolloff chip pulses, the multiuser interference can be decreased by up to 50% (depending on the chip pulse bandwidth) as compared to quasiorthogonal sequences (QOS) that are presently part of the downlink standard of CDMA2000. This reduction of the multiuser interference gives rise to an increase of the achievable signal-to-interference-plus-noise ratio for a particular channel load.