Abstract
Signals designed for transmission over multiple transmit antennas are capable for achieving significant capacity gain. Traditional approaches aim at improving the single-user link with a centralized control over the set of transmit antennas. In this paper, by considering a set of independent and synchronized users communicating with the base station on the up-link, the joint signal can be viewed as space-time coded signal without a centralized control. Co-channel/inter-antenna interference presents a major impairment that limits the capacity. We propose a novel multiuser signal structure called interference-resistant modulation (IRM) to improve performance without coding nor bandwidth expansion. IRM can also be combined with fading-resistant modulation or space-time coding to yield additional gain when each user employs multiple transmit antennas. We prove that, both analytically and by simulations, the IRM with maximum-likelihood (ML) detection achieves the single-user performance asymptotically. Furthermore, to reduce the prohibitive complexity posed by ML detection, we propose a simple minimum-mean-square-error based precombining group detector and an interference cancellation scheme. It is shown that the proposed detector combined with IRM provides significant improvement over previons approaches.
Original language | English |
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Pages (from-to) | 320-329 |
Number of pages | 10 |
Journal | IEEE Journal on Selected Areas in Communications |
Volume | 20 |
Issue number | 2 |
DOIs | |
Publication status | Published - Feb 2002 |
Externally published | Yes |
Keywords
- Group detection
- Multiple transmit antennas
- Multiuser detection
- Multiuser signal design