A new, delay-line-discriminator-based, hybrid RF/digital phase noise cancellation technique

A new, hybrid RF/digital phase noise cancellation technique is presented. The proposed phase noise cancellation technique estimates the phase noise using an RF delay-line-discriminator (DLD), digitizes the DLD output, performs proper digital signal processing (DSP) and then compensates for the phase noise at the digital baseband. This new technique is applicable to both transmitter and receiver and is independent of the modulation and waveform. As part of the DSP, an adaptive linear prediction filter (ALPF) is applied to compensate the analog delay associated with the DLD, low-pass filters, and data conversion. Such delay compensation enhances the phase noise cancellation bandwidth. 30 dB of phase noise cancellation is achieved in simulation using realistic phase noise and component models.