Uplink capacity of a variable density cellular system with multicell processing

• Published in: IEEE transactions on communications Vol. 57; no. 7; pp. 2098 - 2108
• Main Authors: Katranaras, E., Imran, M., Tzaras, C.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.07.2009; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antennas; Applied sciences; Base stations; Cellular; Communication systems; Computer simulation; Decoding; Density; Directive antennas; Equipments and installations; Exact sciences and technology; Fading; Gain; Gaussian channels; Information theory; Information, signal and communications theory; land mobile radio cellular systems; Mathematical analysis; Mathematical models; Mobile radiocommunication systems; Multiaccess communication; multipath channels; Power system modeling; propagation; Radiocommunications; Receiving antennas; Rician channels; Stations; Studies; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); Wireless networks; Power gain; Base station; Wireless telecommunication; Data transmission; Rice fading; Numerical method; Cell network; multiaccess communication; Receiving antenna; Antenna array; Uplink; Power law; Distributed parameter system; Gaussian channels; land mobile radio cellular systems; Mobile radiocommunication; Multiple access; Monte Carlo method; Channel capacity; Coverage; multipath channels; Land mobile radio; Directive antenna; propagation; Analytical method; Numerical simulation; Transmission loss; Information theory
• ISSN: 0090-6778; 1558-0857
• DOI: 10.1109/TCOMM.2009.07.070626

In this work we investigate the information theoretic capacity of the uplink of a cellular system. Assuming centralised processing for all base stations, we consider a power-law path loss model along with variable cell size (variable density of Base Stations) and we formulate an average path-loss approximation. Considering a realistic Rician flat fading environment, the analytical result for the per-cell capacity is derived for a large number of users distributed over each cell. We extend this general approach to model the uplink of sectorized cellular system. To this end, we assume that the user terminals are served by perfectly directional receiver antennas, dividing the cell coverage area into perfectly non-interfering sectors. We show how the capacity is increased (due to degrees of freedom gain) in comparison to the single receiving antenna system and we investigate the asymptotic behaviour when the number of sectors grows large. We further extend the analysis to find the capacity when the multiple antennas used for each Base Station are omnidirectional and uncorrelated (power gain on top of degrees of freedom gain). We validate the numerical solutions with Monte Carlo simulations for random fading realizations and we interpret the results for the real-world systems.