Enhanced continuous-wave interference reduction in low complexity digital direct-sequence spread-spectrum receivers

The performance of low complexity digital direct-sequence spread-spectrum receivers with integrated interference reduction schemes is compared to the analog-receiver and the simple hard-limiter receiver. As an interference situation, we assume additive white Gaussian noise and strong constant envelope continuous wave interference. An interference reduction scheme, consisting of a special 2-bit nonlinearity with matched magnitude window weighting is employed. The received signal´s magnitude distribution and zero-crossings are used to estimate the composition of the interference. By simulation results the proposed adaptive concept is compared to that proposed by Amoroso (1983), which could be described as a robust scheme