Two approaches to multiuser detection over fading channels

Multiuser Detection in Fading Channels

Multiuser scheduling over Rayleigh fading channels

Forthcoming wideband wireless systems are supposed to support services with loose delay requirements, which allows for scheduling of data. In this work we investigate fast transmission scheduling for downlink CDMA over a Rayleigh fading channel. For a logarithmic relation between the channel quality and the effective transmission rate, merely scheduling one user at a time may not result in maxi...

Multiuser Timing Acquisition over Multipath Fading Channels

Existing subspace-based multiuser timing acquisition algorithms for code-division multiple access systems do not account for the multipath channel eeects satisfactorily. We present a new timing acquisition framework that leverages a canonical representation of the mobile wireless channel to fully exploit the underlying signal structure. The proposed approach promises improved performance based ...

MMSE multiuser detection in multipath fading channels

In this work, we propose an MMSE multiuser detector for asynchronous DS/CDMA systems operating over frequency-selective fading channels. It is shown that computation of a conditional MMSE estimate of the bit to be decoded may be carried out with a computational burden linear in the processing gain N . We also give a closed-form formula for the Error Probability and the Nearfar Resistance of the...

Frequency-domain approach to DS-CDMA multiuser detection over frequency-selective slowly fading channels

By extending the frequency-domain approach [1] to practical scenarios such as the frequency-selective slowly fading channels, we justify the value of our proposed frequency-domain approach to multiuser detection in the DS-CDMA communications systems. With this frequencydomain approach which maintains the frequency-domain orthogonality between different users, the DS-CDMA communication is MAI-fr...