Title :
Dynamic spatial CDMA channel assignments for TD-SCDMA systems
Author :
Xiao, Yang ; Lu, Ling-yun ; Habermann, Joachim
Author_Institution :
Inst. of Inf. Sci., Northern Jiaotong Univ., Beijing, China
Abstract :
Limited by the spatial resolution of the smart antenna of TD-SCDMA systems, a cell of current TD-SCDMA systems can only support overlapping 16 digital beams for mobile subscribers. To solve the capacity problem, we use the multiple beams to construct many sectors provided by smart antenna. Since some of the sectors of a cell are orthogonal, we can apply dynamic spatial CDMA channel assignments, which lead to that more mobile subscribers in orthogonal sectors of spatial domain can share one CDMA channel without cross-talk, thus the number of mobile users in a cell can be increased several times. The decoding algorithm of the sectors is derived to detect mobile signals that are spread by the same spreading code. Simulations verified the approach to be valid.
Keywords :
adaptive antenna arrays; code division multiple access; decoding; mobile radio; signal detection; subscriber loops; TD-SCDMA systems; capacity problem solving; decoding algorithm; digital beams; dynamic spatial CDMA channel assignments; mobile signal detection; mobile subscribers; orthogonal cell; overlapping; smart antenna; spatial domain orthogonal sectors; spatial resolution; Adaptive arrays; Antenna arrays; Base stations; Directive antennas; Linear antenna arrays; Mobile antennas; Multiaccess communication; Receiving antennas; Spatial resolution; Time division synchronous code division multiple access;
Conference_Titel :
Decision and Control, 2003. Proceedings. 42nd IEEE Conference on
Print_ISBN :
0-7803-7924-1
DOI :
10.1109/CDC.2003.1272715
