Author_Institution :
Globalstar L.P., San Jose, CA, USA
Abstract :
Analytical methods to analyze the forward service link from satellites to users of non-geostationary multi-beam satellite systems using direct-sequence spread-spectrum code-division multiple-access (DS-SS CDMA) techniques in a Rician fading channel with satellite diversity and power control are presented. Specifically, analytical expressions of the probability of the received ratio of bit-energy to noise-plus-interference density at the user´s RAKE receiver output less than the required ratio are derived. The derived expressions are functions of the satellite constellation, user distribution, loading scenario for satellite antenna beams, spread-spectrum chip rate, information rate, traffic loading for each CDMA carrier, path loss, transmit power, transmit antenna patterns of the satellite antenna beams, receive antenna patterns of the users, Rician fading parameters, satellite diversity order, as well as power control scenario. Thus, this paper provides the analytical methods to determine system availability and capacity for the specified system parameters
Keywords :
Rician channels; code division multiple access; diversity reception; multibeam antennas; multiuser channels; power control; probability; radio receivers; radiofrequency interference; satellite communication; spread spectrum communication; telecommunication control; CDMA carrier; DS-SS CDMA; RAKE receiver output; Rician fading channel; analytical expressions; analytical methods; bit-energy to noise-plus-interference density ratio; code-division multiple-access; direct-sequence spread-spectrum; forward service link; information rate; loading; nongeostationary multibeam satellite systems; path loss; power control; probability; receive antenna patterns; satellite antenna beams; satellite constellation; satellite diversity; satellite diversity order; spread-spectrum chip rate; system availability; system capacity; system parameters; traffic loading; transmit antenna patterns; transmit power; user distribution; Fading; Loaded antennas; Multiaccess communication; Power control; Receiving antennas; Rician channels; Satellite antennas; Signal to noise ratio; Spread spectrum communication; Transmitting antennas;
