Title :
Multirate CDMA Receivers with Adaptive Antennas in Multipath Fading Channels
Author :
Ueng, Fang-Biau ; Chen, Jun-Da ; Tsai, Shang-Chun ; Lin, Cen-Lan
Author_Institution :
Dept. of Electr. Eng., Nat. Chung-Hsing Univ., Taichung
Abstract :
Smart antennas, with spatial processing, used in multirate code division multiple access (CDMA) systems can enhance range, reliability and capacity. In this paper, we propose three multirate methodologies, including variable processing gain, variable chip rate and multicode systems in adaptive antenna receiver structures for direct-sequence (DS) CDMA multiuser communications in multipath fading channels. Least mean square (LMS) algorithm is employed in narrowband and wideband receiver structures to adjust the spreading code coefficients. Simulation examples are given to compare the performances of the three proposed multirate receiver structures
Keywords :
adaptive antenna arrays; code division multiple access; fading channels; least mean squares methods; multipath channels; multiuser channels; radio receivers; spread spectrum communication; LMS; adaptive antenna; direct-sequence code division multiple access; least mean square algorithm; multipath fading channel; multirate DS-CDMA receiver; multiuser communication; narrowband receiver structure; smart antenna; spatial processing; spreading code coefficient; wideband receiver structure; Adaptive arrays; Adaptive systems; Bandwidth; Broadband antennas; Fading; Gain; Multiaccess communication; Receiving antennas; System performance; Wiener filter;
Conference_Titel :
Communication systems, 2006. ICCS 2006. 10th IEEE Singapore International Conference on
Conference_Location :
Singapore
Print_ISBN :
1-4244-0411-8
Electronic_ISBN :
1-4244-0411-8
DOI :
10.1109/ICCS.2006.301540
