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Towards Systems Beyond 3G Based on Adaptive OFDMA Transmission

Mikael Sternad ; Tommy Svensson (Institutionen för signaler och system, Kommunikationssystem) ; Tony Ottosson (Institutionen för signaler och system, Kommunikationssystem) ; Anders Ahlen ; Arne Svensson (Institutionen för signaler och system, Kommunikationssystem) ; Anna Brunström
Proceedings of the IEEE Vol. 95 (2007), 12, p. 2432 - 2455.
[Artikel, refereegranskad vetenskaplig]

High data rates, high spectral efficiency, flexibility, and low delays over the air interface will be important features in next-generation wireless systems. The overall challenge will be packet scheduling and adaptive radio transmission for multiple users, via multiple antennas and over frequency-selective wideband channels. This problem needs to be structured to obtain feasible solutions. The basic simplifying assumptions used here are clustering of antennas into cells, orthogonal transmission by use of cyclic-prefix orthogonal frequency-division multiplexing (OFDM) and a time-scale separation view of the total link adaptation, scheduling and intercell coordination problem. Based on these assumptions, we survey techniques that adapt the transmission to the temporal, frequency, and spatial channel properties. We provide a systematic overview of the design problems, such as the dimensioning of the allocated time-frequency resources, the influence of duplexing schemes, adaptation control issues for downlinks and uplinks, timing issues, and their relation to the required performance of channel predictors. Specific design choices are illustrated by recent research within the Swedish Wireless IP program and the EU IST-WINNER project. The presented results indicate that high-performance adaptive OFDM transmission systems are indeed feasible, also for challenging scenarios that involve vehicular velocities, high carrier frequencies, and high bandwidths.

Nyckelord: broadband radio transmission, link adaptation, channel-aware scheduling, channel estimation, orthogonal frequency-division multiple access (OFDMA), orthogonal frequency-division multiplexing (OFDM), channel prediction, spatial division multiple access (SDMA), timedivision multiple access (TDMA), wireless broadband

Invited paper.

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Denna post skapades 2007-10-08. Senast ändrad 2015-03-30.
CPL Pubid: 51941


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