Title :
On the effects of user mobility on the uplink an OFDMA system
Author :
Galda, Dirk ; Rohling, Hermann ; Costa, Elena
Author_Institution :
Dept. of Telecommun., Technische Univ. Hamburg-Harburg, Hamburg, Germany
Abstract :
The combination of the OFDM transmission technique with a channel adaptive FDMA multiple access can increase the bandwidth efficiency and flexibility of a communication system. However, in an environment with mobile users inter carrier interference and the time-variance of the channel transfer function demand for robust system design which can tolerate these impairments while still maintaining the required system performance. In this paper the impact of different effects of user mobility are studied for an OFDM uplink and compared before the background of their influence on the overall system performance. A system will be proposed that offers the same performance as a conventional OFDM uplink system even under these conditions.
Keywords :
OFDM modulation; channel allocation; channel estimation; cochannel interference; frequency division multiple access; mobile communication; radio links; telecommunication network management; transfer functions; OFDM transmission; OFDMA uplink system; bandwidth efficiency; channel adaptive FDMA; channel estimation; channel transfer function; communication system flexibility; intercarrier interference; multiple access interference; resource management; robust system design; subcarrier allocation; system time variance; users mobility; Bit error rate; Channel estimation; Computational complexity; Fading; Frequency division multiaccess; Helium; Multiple access interference; OFDM; Receivers; Resource management;
Conference_Titel :
Vehicular Technology Conference, 2003. VTC 2003-Spring. The 57th IEEE Semiannual
Print_ISBN :
0-7803-7757-5
DOI :
10.1109/VETECS.2003.1207866
