Title :
Effect of delayed commands on error probability and throughput capacity in a multiple access system
Author_Institution :
Nokia Res. Center, Irving, TX, USA
Abstract :
The channel correlation coefficient is a function of maximum Doppler frequency shift and delay. The effect of the correlation coefficient on a multiple access system, that schedules for transmission to the user with the strongest channel, is characterized in terms of the probability density function (pdf). It is shown that the system performance-in terms of error probability and throughput capacity-degrades significantly with the decrease of correlation coefficient. Thus, in order to achieve the desired target performance in terms of error probability, additional transmission power is required to compensate for a low correlation coefficient. Error probability curves for fading channels can he derived quasi-analytically based on the corresponding curves obtained in additive white Gaussian noise (AWGN) channels. Also, for a constant transmission power, an analytical expression of throughput-capacity, a function of the correlation coefficient, is provided.
Keywords :
AWGN channels; Doppler shift; adaptive modulation; correlation methods; error statistics; fading channels; multi-access systems; multipath channels; AWGN; adaptive modulation; additive white Gaussian noise channels; channel correlation coefficient; error probability delayed command effects; flat fading channels; maximum Doppler frequency shift; multipath channels; multiple access system; probability density function; throughput capacity; AWGN; Capacity planning; Delay effects; Delay estimation; Error probability; Fading; Frequency; Modulation coding; Scheduling; Throughput;
Conference_Titel :
Vehicular Technology Conference, 2003. VTC 2003-Fall. 2003 IEEE 58th
Print_ISBN :
0-7803-7954-3
DOI :
10.1109/VETECF.2003.1285019
