Blind signal detection in multiuser code division multiple access (CDMA) system is particularly attractive when only the desired user signature is known to a given receiver. A problem common to several existing blind multiuser CDMA detectors is that the detection performance is very sensitive to the signature waveform mismatch (SWM) which may be caused by channel distortion. In this paper, we consider the design of a blind multiuser CDMA detector that is robust to the SWM. We present a convex formulation for this problem by using the second-order cone (SOC) programming. The resulting SOC problem can be solved efficiently using the recently developed interior point methods. Computer simulations indicate that the performance of our new robust blind multiuser detector is superior to those of many existing methods.
Bibliographical noteFunding Information:
Manuscript received December 6, 2002; revised September 30, 2003; accepted May 4, 2004. The editor coordinating the review of this paper and approving it for publication is A. Yener. The work of S. Cui, M. Kisialiou, and Z.-Q. Luo was supported by the Natural Sciences and Engineering Research Council of Canada under Grant OPG0090391, and by the Canada Research Chair Program. The work of Z.-Q. Luo was also supported in part by the National Science Foundation under Grant CCR-0196364, Grant ECS-0121469, and Grant DMS-0312416.
- Blind multiuser detection
- Robust multiuser detection
- Second-order cone (SOC) programming