SYSTEM FOR CONTINUOUS WAVE REJECTION

摘要

A method is disclosed for receiving transmitted signals in the presence of C W interference in a communication system that determines the presence of a cod e in a received signal by comparing with a detector threshold calculations mad e in accordance with a sample of a received signal. Such systems include but a re not limited to those incorporating a Sequential Probability Ratio Test. The method includes obtaining a first input power value of the received signal a t a first sample time and obtaining a second input power value of the received signal at a second sample time. The first and second power values are compar ed in order to provide an input sample comparison and the forgoing steps are repeated in order to provide a plurality of input sample comparisons. The detector threshold is adjusted in accordance with the plurality of sample comparisons. The CW signal can be strongly correlated with a short code used for the acquisition purposes. Therefore in the CDMA systems if the received signal contains a CW signal, then the strong correlation between the CW sign al and the short code used for acquisition may result in a false alarm. To prevent this, the following algorithm is suggested to be used for the cancellation of CW, if there is a CW signal present in the received CDMA signal.