Optimum and suboptimum CDMA detectors: Near-far resistance under multipath

Near-far resistance is one of the most important performance measures in a multiuser communication system, especially in a CDMA system. The optimum multiuser detector can achieve the optimum near-far resistance. But due to its high computational complexity, the optimum detector is impractical to implement. Cost-effective suboptimum detectors are more practical to implement. In this paper, we derive the near-far resistance of the optimum detector and some linear detectors, and compare them each other. Computer simulations are also performed to compare with the theoretical results.