Title :
Reliable uplink code-timing synchronization for cellular DS-CDMA
Author :
Wei, Y. ; Krogmeier, J. ; Gelfand, S.
Author_Institution :
Sch. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN, USA
Abstract :
For the uplink of a CDMA system, some knowledge about the active users is known to the base station and can be used to improve code-timing acquisition of a new arrival. Based on this idea, two maximum-likelihood (ML) code-timing estimation algorithms are proposed. It is shown that both estimators can effectively cancel the multiple-access interference giving robustness to near-far ratio and system load. This fact is verified by simulation results, which also show their superiority to known algorithms
Keywords :
cellular radio; code division multiple access; interference suppression; maximum likelihood estimation; multiuser channels; radio links; radiofrequency interference; spread spectrum communication; synchronisation; timing; base station; cellular DS-CDMA system; direct sequence code division multiple access; maximum-likelihood code-timing estimation algorithms; multiple-access interference cancellation; near-far ratio; reliable uplink code-timing synchronization; simulation results; system load; Base stations; Direct-sequence code-division multiple access; Gaussian processes; Interference cancellation; Maximum likelihood estimation; Multiaccess communication; Multiple access interference; Reliability engineering; Robustness; Timing;
Conference_Titel :
Spread Spectrum Techniques and Applications, 2000 IEEE Sixth International Symposium on
Conference_Location :
Parsippany, NJ
Print_ISBN :
0-7803-6560-7
DOI :
10.1109/ISSSTA.2000.876509
