Title :
Spatial equivalence classes for CDMA array processing
Author :
Sweatman, Catherine Z W Hassell ; Mulgrew, Bernard ; Thompson, John S. ; Grant, P.M.
Author_Institution :
Dept. of Electron. & Electr. Eng., Edinburgh Univ., UK
Abstract :
We consider the reverse link of a cellular direct sequence CDMA system with the aim of increasing the system´s capacity. The capacity of a conventional (matched filter) receiver can be increased by employing sectorized antenna arrays or multiuser detection techniques. Our results confirm that the potentially complex approach of beamforming followed by multiuser detection further increases capacity. To reduce complexity, bit detection techniques based on partitioning the users into spatial equivalence classes by beamforming and then employing standard multiuser detection techniques within each class are investigated. Subtractive interference cancellation yields the lowest bit error ratios and is the least computationally complex method of multiuser detection under consideration
Keywords :
Rayleigh channels; adaptive antenna arrays; adaptive signal processing; array signal processing; cellular radio; channel capacity; code division multiple access; error statistics; interference suppression; multipath channels; multiuser channels; radio links; radio receivers; signal detection; spread spectrum communication; BER; BPSK; PN codes; Rayleigh fading multipath channels; array processing; beamforming; binary phase shift keying; bit detection techniques; bit error ratio; cellular direct sequence CDMA system; complexity reduction; direct sequence spread spectrum system; matched filter receiver; multiaccess interference; multiuser detection; reverse link; sectorized antenna arrays; spatial equivalence classes; subtractive interference cancellation; system capacity; Antenna arrays; Array signal processing; Base stations; Matched filters; Multiaccess communication; Multiple access interference; Multiuser detection; RF signals; Radio frequency; Receiving antennas;
Conference_Titel :
Communications, 1999. ICC '99. 1999 IEEE International Conference on
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-5284-X
DOI :
10.1109/ICC.1999.767998