Title :
Analysis of the linear SIC for DS/CDMA signals with random spreading
Author :
Lai, Kuei-Chiang ; Shynk, John J.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of California, Santa Barbara, CA, USA
Abstract :
The linear successive interference canceler (LSIC) is a multiuser detector that employs the magnitude of the matched filter (MF) output as the received amplitude estimate of the detected user for use in signal reconstruction. This paper investigates the performance of the LSIC when random spreading sequences are employed. Specifically, the conditional mean and the signal-to-interference-plus-noise ratio (SINR) of the decision variable in each stage are derived to quantify the effects due to imperfect symbol and amplitude estimates. In addition, under the constraint that each user must achieve a certain SINR requirement, we examine the received powers needed for each of a specified number of users and the maximum number of users that a system can support when the LSIC is used in a base station. Computer simulations are presented to compare these results with those of several linear multiuser detectors.
Keywords :
amplitude estimation; code division multiple access; interference suppression; multiuser detection; radiofrequency interference; random sequences; signal reconstruction; spread spectrum communication; DS-CDMA signal; direct-sequence code-division multiple-access; linear multiuser detector; linear successive interference canceler; matched filter; random spreading sequence; signal reconstruction; signal-to-interference-plus-noise ratio; Amplitude estimation; Base stations; Detectors; Interference cancellation; Matched filters; Multiaccess communication; Signal analysis; Signal reconstruction; Signal to noise ratio; Silicon carbide; 65; Adaptive signal detection; cochannel interference; code division multiple access; communication systems; land mobile radio cellular systems;
Journal_Title :
Signal Processing, IEEE Transactions on
DOI :
10.1109/TSP.2004.837435
