Title :
On ping-pong effects in linear interference cancellation for CDMA
Author :
Rasmussen, Lars K.
Author_Institution :
Dept. of Comput. Eng., Chalmers Univ. of Technol., Goteborg, Sweden
Abstract :
In this paper we formulate a general iterative form to described hybrid interference cancellation, a concept which includes both successive interference cancellation (SIC) and parallel interference cancellation (PIC) as its two extreme cases. Furthermore, the ping-pong effect commonly observed in linear PIC is studied in detail and is shown to be a direct consequence of the extreme eigenvalues of the iteration matrix. Intervals for the dominating eigenvalues within which ping-pong is likely to occur are specified. These intervals are then used to determine weighting factors for partial cancellation such that ping-pong effects are avoided
Keywords :
code division multiple access; eigenvalues and eigenfunctions; error statistics; interference suppression; iterative methods; land mobile radio; matrix algebra; multiuser channels; radiofrequency interference; BER; CDMA; biased decision statistic; eigenvalues; hybrid interference cancellation; iteration matrix; iterative form; linear PIC; linear interference cancellation; mobile radio; parallel interference cancellation; partial cancellation; ping-pong effects; successive interference cancellation; weighting factors; Convergence; Decorrelation; Delay; Detectors; Eigenvalues and eigenfunctions; Interference cancellation; Jacobian matrices; Multiaccess communication; Multiple access interference; Silicon carbide;
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.2000.876454
