Title :
Downlink capacity enhancement in GSM systems with frequency hopping and multiple beam smart antennas
Author :
Ahmed, Mohamed H. ; Wang, Wei ; Mahmoud, Samy A.
Author_Institution :
Dept. of Syst. & Comput. Eng., Carleton Univ., Ottawa, Ont., Canada
Abstract :
The system capacity of TDMA systems can be enhanced by utilizing the slow frequency hopping feature. More capacity gain can be achieved if interference reduction techniques such as smart antennas and discontinuous transmission are used. This paper addresses the capacity gain in the downlink due to the use of smart antennas in an FH-TDMA cellular system. We estimate the system capacity analytically and by simulation. Multiple switched beam smart antennas are utilized in the study. Perfect power control and discontinuous transmission (using voice activity) are assumed in the simulation and in theoretical analysis. The TDMA system is assumed to be GSM-like. However the analysis is valid for any TDMA system
Keywords :
adaptive antenna arrays; cellular radio; channel capacity; digital simulation; fading channels; frequency hop communication; interference suppression; multibeam antennas; multiuser channels; power control; probability; radio links; radiofrequency interference; stochastic processes; telecommunication control; time division multiple access; FH-TDMA cellular system; GSM systems; capacity gain; discontinuous transmission; downlink capacity enhancement; interference reduction techniques; multiple beam smart antennas; multiple switched beam smart antennas; outage probability; perfect power control; simulation; slow frequency hopping; stochastic analysis; system capacity estimation; voice activity; Admission control; Analytical models; Computational modeling; Downlink; Frequency diversity; Frequency estimation; GSM; Interference; Power control; Time division multiple access;
Conference_Titel :
Communications, 2000. ICC 2000. 2000 IEEE International Conference on
Conference_Location :
New Orleans, LA
Print_ISBN :
0-7803-6283-7
DOI :
10.1109/ICC.2000.853651
