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  • 1.
    Lei, Zhu
    KTH, Superseded Departments, Signals, Sensors and Systems.
    On the Downlink Performance of Multicarrier Allocation (MCA)-based System for Wireless IP Networks2001Conference paper (Refereed)
    Abstract [en]

    Wireless IP is becoming a cutting-edge technology to accomplish Internet truly wireless. Aiming at transmitting IP packets over wireless bearer efficiently, Multicarrier is believed to be a good candidate by offering flexible and high peak rate to each user, as well as reducing buffer size at a receiver. In this article, we take a glimpse at current wireless access technologies for wireless IP, and then from the aspect of radio resource management (RRM), introduce a multicarrier allocation (MCA) approach. Focusing on impacts of frequency diversity, power control, and so-called carrier-grouping techniques, we discuss and investigate the downlink performance enhancement of multicarrier based systems, in terms of spectral efficiency (data throughput) and system fairness. As a brief investigation, simulations are conducted on network level. Finally, conclusions are drawn that frequency diversity in combine with maximal ratio combining obtains significant improvement on both spectral efficiency and system fairness. Dealing with co-channel interference, power control and carrier-grouping enhance system fairness. We also caution that study radio resource management for multicarrier based systems is interested and important.

  • 2.
    Lei, Zhu
    KTH, Superseded Departments, Signals, Sensors and Systems.
    RRM in Multicarrier Allocation-Based Systems2002In: WIRELESS IP AND BUILDING THE MOBILE INTERNET / [ed] Dixit S, Prasad R, Norwood: Artech House Publishers , 2002, 1, p. 255-276Conference paper (Refereed)
  • 3.
    Lei, Zhu
    et al.
    KTH, Superseded Departments, Signals, Sensors and Systems.
    Ben Slimane, Slimane
    KTH, Superseded Departments, Signals, Sensors and Systems.
    A multicarrier allocation (MCA) scheme for variable-rate 3Gwireless systems2000In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 38, no 10, p. 86-91Article in journal (Refereed)
    Abstract [en]

    High spectral efficiency and flexible data rate access are the main focus of future wireless networks. Multiple channel allocation schemes have the potential of achieving this goal. By assigning multiple slots and/or multiple carriers to one user, it is possible to provide a flexible data rate with quite low complexity. In this article we propose a simple allocation scheme where each user is assigned a fixed group of carriers. These carriers are adaptively used depending on the interference situation within the system. The system performance in terms of average throughput is investigated for two different types of allocation schemes: a fully centralized scheme and a distributed one that uses frequency diversity as a mean of improving the user link quality. The obtained results show that both schemes improve the system throughput over single carrier allocation without affecting the capacity of the system in terms of number of users per cell.

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