Interference suppression performance of an adaptive direct sequence spread spectrum receiver

The code segments generated by a pseudorandom noise generator are divided into groups according to the number of the chips taking on the value -1 in each segment, or equivalently according to the imbalance in the numbers of -1s and 1s. The author examines the average residual interfering power seen at the receiver baseband when the segments from each group are used for the despreading operation. It is found that such a power either increases or decreases with the degree of imbalance, depending on whether an interfering state discriminator output is positive or negative. The suppression performance of the conventional direct-sequence spread-spectrum receiver by using code segments with either large or small imbalances