Effects of path loss and fringe user distribution on CDMA cellularfrequency reuse efficiency

摘要

Expressions that quantitatively describe the impact of path lossand user distribution on CDMA (code division multiple access) cellularradio system performance are determined. Path loss in typicalmicrocellular and cellular channels is shown to increase exponentiallywith distance, to between the second and third power, as opposed to thecommonly quoted fourth power law. Two performance measures, frequencyreuse efficiency and bit error rate probability, are evaluated for CDMAcellular systems. Values for frequency reuse efficiency are derived forthe uplink using different propagation rules and spatial distributionsof subscribers in adjacent cells. Bit error rate probabilities are foundas a function of the number of users for a two-cell downlink model thatassumes the subscriber is straddling the cell boundaries